Newton's law of motion Questions and Answers

10 points What is the momentum of a 1 575 kg car movin

nelastic or Elastic Determine the problem type and PROVE it by examining the kinetic energ of the objects 1 Two carts with masses 10 kg and 2 5 kg respectively move in opposite directions on a frictionless horizontal track with speeds 6 m s and 3 m s respectively The carts stick together after colliding head on Find the final speed of the two carts 2 A 0 005 kg coin moving to the right at 0 25 m s makes an elastic head on collision with a 0 015 kg coin that is initially at rest After the collision the 0 005 kg coin moves to the left at 0 125 m s Find the 6

FC 3 219 OTO VF3 FT If the acceleration of the cart is 3 5 m s to the right and the frictional force acting on the wheels of the cart has a magnitude of 35 N calculate the mass of the hanging block

If an astronaut had a mass of 85 kg on the moon what would his mass be on earth If the astronaut had a weight of 139 N on the moon what would his weight be on earth

tructions Be sure to present your answers in a clear manner showing all of your work That is include equations w your steps use proper units and clearly illustrate your final answer by using therefore statements Use Newton s second law to show the conditions under which the normal force acting on a mass would be equal to its weight Make sure to include a free body diagram and summarize your general findings in a final statement

a sca 2 An object is released from rest How far does it fall during the 3rd second of its free fall Show your work below

A 79 ton monolith is transported on a causeway that is 3000 feet long and has a slope of about 1 2 How much force parallel to the incline would be required to hold the monolith on this causeway A force of tons is required to hold the monolith on the causeway Round to the nearest tenth as needed GOCOM

77777 Horizontal Floor 6 0 m s 0 10 kg 0 80 m i the top of the circle ii the bottom of the circle 0 20 m 1992B1 A 0 10 kilogram solid rubber ball is attached to the end of an 0 80 meter length of light thread The ball is swung in a vertical circle as shown in the diagram above Point P the lowest point of the circle is 0 20 meter above the floor The speed of the ball at the top of the circle is 6 0 meters per second and the total energy of the ball is kept constant a Determine the total energy of the ball using the floor as the zero point for gravitational potential energy b Determine the speed of the ball at point P the lowest point of the circle C Determine the tension in the thread at The ball only reaches the top of the circle once before the thread breaks when the ball is at the lowest point of the circle d Determine the horizontal distance that the ball travels before hitting the floor

A long board is free to rotate about the pivot shown in each of the four configurations shown Weights are hung from the board as indicated In which of the configurations if any is the net torque about the pivot axis the largest 10 2 3 m 4 03 4 2 m m m m m m m

M H 1978B2 A block of mass M travels horizontally with a constant speed v on a plateau of eight H until it comes to a cliff A toboggan of mass M is positioned on level ground below the cliff as shown above The center of the toboggan is a distance D from the base of the cliff a Determine D in terms of v H and g so that the block lands in the center of the toboggan b The block sticks to the toboggan which is free to slide without friction Determine the resulting velocity of the block and toboggan

Suppose that a car traveling to the east x direction begins to slow down as it approaches a traffic light Which statement concerning its acceleration must be correct Its acceleration is zero OOOO Its acceleration is in the x direction Its acceleration is decreasing in magnitude as the car slows down Its acceleration is in the x direction

A diver climbs up the stairs to the diving tower The work he does climbing the stairs is half his kinetic energy just as he hits the water equal to his kinetic energy just as he hits the water half his potential energy just as he hits the water equal to his potential energy just as he by the water

In the photo a locomotive has broken through the wall of a train station During the collision what can be said about the force exerted by the locomotive on the wall Studio L vy and Sons O The force exerted by the locomotive on the wall was less than the force exerted by the wall on the locomotive O The wall cannot be said to exert a force after all it broke O The force exerted by the locomotive on the wall was larger than the force the wall could exert on the locomotive O The force exerted by the locomotive on the wall was the same in magnitude as the force exerted by the wall on the locomotius

A large crate of mass m is placed on the back of a truck but not tied down As the truck accelerates forward with an acceleration a the crate remains at rest relative to the truck What force causes the crate to accelerate O the normal force O the force of gravity O the force of friction between the crate and the floor of the truck O the ma force O none of these

A The tensions in all three cords have equal magnitude B The tension in the uppermost cord has 9 times the magnitude of the tension in the lowest cord

F 10 kg 77777 1981B1 A 10 kilogram block is pushed along a rough horizontal surface by a constant horizontal force F as shown above At time t 0 the velocity v of the block is 6 0 meters per second in the same direction as the force The coefficient of sliding friction is 0 2 Assume g 10 meters per second squared a Calculate the force F necessary to keep the velocity constant The force is now changed to a larger constant value F The block accelerates so that its kinetic energy increases by 60 joules while it slides a distance of 4 0 meters b Calculate the force F c Calculate the acceleration of the block

23 A ball of mass m is suspended from a bar of mass M with a light inextensible cord The bar can slide on a frictionless slope of inclination 0 Initially the bar is held at rest so that ball also stays motionless as shown Find acceleration of the ball immediately after the bar is released m wys

Solve this problem if you pulled a friend on a sled and your friend and the sled had a mass of 70 kilograms and the sled s acceleration was 2 m s2 What is the force you are using to push the sled Include the proper metric unit in your answer

For the following situations draw a free body diagram in which you represent the various forces that are acting upon the object s using vector arrows Label each arrow to indicate the type of force Determine the magnitude of all forces and fill in the blanks 1 2 3 4 A 1 0 kg book is at rest on a tabletop Diagram the forces acting on the book FBD Fy Norman fovlar Force of air Vessistance els 5 8 and 9 Srevity Fx fore of ax A 5 0 kg flying squirrel is flying from a tree to the ground at constant velocity Consider air resistance Diagram the forces acting on the squirrel FBD Fx ax ay Force Fx of gravity ax Fy An egg with a weight of 0 10 N is free falling from a nest in a tree Neglect air resistance Diagram the forces acting on the egg as it is falling gravity FBD 101 Pr ay Fy ay A 2 0 kg bucket is tied to a rope and accelerated upward out of a well at a rate of 1 5 m s s Neg air resistance Diagram the forces acting on the bucket FBD cosed Y E

Rope 77777 1983B1 A box of uniform density weighing 100 newtons moves in a straight line with constant speed along a horizontal surface The coefficient of sliding friction is 0 4 and a rope exerts a force F in the direction of motion as shown above a On the diagram below draw and identify all the forces on the box 2m F b Calculate the force F exerted by the rope that keeps the box moving with constant speed 5 3 F C A horizontal force F applied at a height 5 3 meters above the surface as shown in the diagram above is just sufficient to cause the box to begin to tip forward about an axis through point P The box is 1 meter wide and 2 meters high Calculate the force F

A 70 kg woman and her 35 kg son are standing at rest on an ice rink as shown above They push against each oth for a time of 0 60 s causing them to glide apart The speed of the woman immediately after they separate is 0 55 r Assume that during the push friction is negligible compared with the forces the people exert on each other a Calculate the initial speed of the son after the push b Calculate the magnitude of the average force exerted on the son by the mother during the push c How do the magnitude and direction of the average force exerted on the mother by the son during the push compare with those of the average force exerted on the son by the mother Justify your answer d After the initial push the friction that the ice exerts cannot be considered negligible and the mother comes to rest after moving a distance of 7 0 m across the ice If their coefficients of friction are the same how far does the son move after the push

You roll a ball It soon rolls to a stop How would Aristotle interpret this How would Galileo interpret it

A frictionless disc of mass 0 50 kg is moving in a straight line across an air table at a speed of 2 4 m s when it bumps into an elastic band stretched between two fixed posts If the elastic band exerts an average opposing force of 1 4 N on the disc for 1 5 s what will be the final velocity of the disc 1 8 m s in a direction opposite to the initial velocity

A ball falls to the ground Which of the following statements are false Select all that apply O Earth pulls much harder on the ball than the ball pulls on Earth so the ball falls while Earth remains stationary The force that the ball exerts on Earth is equal in magnitude to the force that Earth exerts on the ball The ball undergoes the same acceleration as Earth

m A 1 1 kg apple hits the ground moving at 15 8 S If the ground stops the apple in 0 40 s what was the magnitude of the net force between the ground and the apple

7 Pulling out of a dive the pilot of an airplane guides his plane into a vertical circle with a radius of 600 m At the bottom of the dive the speed of the airplane is 150 m s What is the apparent weight of the 70 kg pilot at that point 8 points

You are pulling three blocks a friction Countertop no shown as shown The masses of the lokg and a force of What is 2 three blocks m 3 T3 the blocks are on 49 kg You are applying ION to the first block acceleration of the system 2 13 kg m lokg

Question 1 Points 3 A football is dropped from a height of 25 feet and the ball bounces with each bounce as high as the preceding one What is the total distance it would have traveled by the 8th bounce O 1 67 ft O 4 67 ft O 25 ft 41 67 ft

Referring to the picture below where each weight equals 62 N What does the spring scale read Fw1 Spring Scale Fw2

nction Function 9 A bouncy ball is dropped off a 60ft tall building After the first bounce it reached a height of 42ft After the third bounce it reached 20 58ft Create a function to predict the height of the 6th bounce Round to the nearest tenth one number after the decimal What is the ratio What is the starting value Height of the 6th bounce

10 points A soccer ball is kicked with a net force that delivers an impulse with a magnitude of 62 5 N s over a 0 77 s time interval What is the magnitude of the net force of the kick O 58 6 N O O C 69 6 N O81 2 N 14 17 AT

Which bus is more likely to collide with a deer crossing the road based on the information provided in this scenario Choose the correct answer and describe your thinking below You do not need to show math in your answer 5 pts a The first bus will more likely collide with a deer b The second bus will more likely collide with a deer

The curved section of a horizontal highway is a circular unbanked arc of radius 740 m If the coefficient of static friction between this roadway and typical tires is 0 40 what would be the maximum safe driving speed for this horizontal curved section of highway 16 points

3 m s m s Question 5 Add your answer Question 6 the post Ysteel places Atmospheric pressure is about 1 01 x 105 Pa How large a force does the atmosphere exert on a 4 6 cm on the top of your head Round your answer to 2 decimal places Add your answer 200 GPa 3 Points 3 Points A 60 kg woman stands on a light cubical box that is 5 cm on each edge The box sits on the floor What pressure does the box exert on the floor Round your answer to 2 decimal places

A massive unknown object is moving at a speed of 55 73 m s and must be stopped before it wrecks a building What force should Ironman apply to it in 5 s if it weighs 1280 9 kg

Question 7 A 4 kg block is moving at a speed of 3 12 m s What is the force required to bring the block to a stop in 0 001 s Round your answer to 2 decimal places Add your answer Question 8 Add your answer A projectile weighing 105 lbs strikes the concrete wall of a fort with an impact velocity of 1118 ft s The projectile comes to rest in 0 05 second having penetrated the 8 foot thick wall to a distance of 6 feet What is the average force exerted on the wall by the projectile Round your answer to 2 decimal places uestion 11 3 Points 112 3 Points slides with a velocity of 21 cms on a sindoth level surface and makes a head on collisian with site direction with a velocity of 10 cnvs if the collision is perfectly elastic what is the velocity of

Question 9 A massive unknown object is moving at a speed of 57 76 m s and must be stopped before it wrecks a building What force should Ironman apply to it in 4 s if it weighs 1230 88 kg Add your answer Screens 21 png 3 Points i Screens 22 pngi

Use symmetry to find one normal mode of vibration eigenmode of a system of 5 masses and 6 springs and two walls if all the masses and spring constants are equal to 1

When you trip your foot stops but your body continues to move forward Which statement best explains why this happens 1 point The unbalanced force that stops your foot pulls your body forward O Inertia pushes your body forward after your foot stops O An unbalanced force pushes your body forward O An unbalanced force stops your foot but does not act on the rest of your body

5 A billiard ball of mass 0 4kg initially travelling at 10 m s E experiences a glancing elast collision with a second ball of equal mass The second ball shown as m2 obtains a velocit 8 68 m s directed at an angle of 29 79 degrees shown as 92 Determine the full velocity of first ball 12 12 8 m 12 j m 0 02 3 12 i m

What is the present scientific status of Newtonian physics a We now know for certain that Newtonian physics is correct b Although we cannot know for certain that Newtonian physics is correct no violations have ever been discovered c Newtonian physics does not apply to very small objects but otherwise no violations have been discovered d Newtonian physics does not apply to very small objects high speed objects and very strong gravitational forces e Newtonian physics is now known to be wrong and thus it is no longer useful in science O a Ob OC Od

In the lab on Newton s 2nd Law a a cart on a horizontal air track was connected to a hangi mass by a string that was draped over a pulley and the two objects accelerated until the hanging mass hit the floor While the objects were accelerating the tension in the string wa a less than the weight of the hanging mass b equal to the weight of the hanging mass c greater than the weight of the hanging mass

If the resultant of 3 vectors has a magnitude of 10 Newtons and a direction of 100 then equilibrant for those 3 vectors must have a magnitude 10 Newtons direction 100 magnitude 20 Newtons direction 180 C magnitude 10 Newtons direction 280 Od magnitude 20 Newtons direction 280 0 magnitude 10 Newtons direction 100 b e

When a particular ramp is raised to an angle of 20 above the horizontal a box starts to s down the ramp If the ramp is only raised to an angle of 100 then the frictional force will be a less than usN b greater than gN C less than W sin 10 d greater than Wsin10

Study the force system diagram pictured below and select the factor which would NOT influence the amount of kinetic friction FA m FN V FEEEEEE Fe LIK Fi a applied force FA b the force of gravity c object s mass m d coefficient of kinetic friction

15 points A 0 5 kg mass resting on a smooth tabletop 1 m high is pushed into a spring with spring constant 200 N m as shown in the figure With the spring compressed 0 5 m the mass is released and after it loses ntact with the spring it collides with a stationary 2 kg mass A graph of the force exerted on the 2 kg mass during the collision is shown below F N 480 1 m 2 5 12 5 15 10 a Determine the speed of the 0 5 kg mass after it has left the spring but before it has hit the 2 kg mass b Determine the speed of the 2 kg mass after the collision e Determine the energy lost in the collision d Determine the distance between the impact points of each object when they finally strike

Tension on the string at point P is T The graph for tension T versus x is shown in the figure Then the string is TA In PL x 0 M 1 massless 2 massfull x L 4 None of these X 3 tension on every point on the string is same when the string is having finite mass 4

1 An elevator starts from rest on the bottom floor of a building and moves upwards accelerating at 2 0m s A man riding in it has a mass of 85 kg a Construct a force diagram for the man using agent object notation 4 Fn b What force does the floor exert on the man 85kg 10m s 2 850Fn c How long does it take the elevators to reach a velocity of 2 5 m s d How high does the elevator go before reaching a velocity 2 5 m s

1 A man standing on level ground tries to drag a 705 N log behind him by exerting a horizontal force of 323 N If the coefficients of static and kinetic friction are 0 475 and 0 321 respectively a 10 pnts Draw a Free Body Diagram for the log b 20 points Calculate the maximum friction force Does the man move the log If not how much force does friction exert on the log

A wagon weighing 225 N represented by force G is parked on a driveway that is inclined 18 to the horizontal as shown The figure is not drawn to scale 189 R GV Complete the following Do not round any intermediate computations and round your answers to the nearest hundredth a Find the magnitude of the force Q required to prevent the wagon from rolling down the driveway N b Find the magnitude of the force C of the wagon against the driveway