Newton's law of motion Questions and Answers

Three forces of A B C act on a bolt as shown in the figure below Where A 250 N B 285 N and C 290 N Find the resultant force magnitude and direction C 25 0 62 6 A 42 2 B 25 0 Z 742 2 C 62 6 Resultant Force 125 N Direction 131 Resultant Force 145 N Direction 151 O Resultant Force 115 N Direction 121 O Resultant Force 135 N Direction 141 B

estion 15 4 points he following figure shows two mass ver an ideal pulley The mass m is 8 riction between the table and mass Calculate the acceleration of the n Calculate the tension in the rope

A 45 block is moving at a velocity of 11 53 m s on a frictionless surface A constant force F is applied for 2 1 seconds which caused the block to accelerate at a rate of 6 36 m s 2 Find F Round your apower

IN Fa fs 10kg 150N I mg 10g 98 b What is the value of the normal force acting on the box Fn m g Fn 10 0 g 9 8m s 98N F 98N c If the box accelerates to the right at 7 50 m s2 what is the force of friction acting on the box to the left 2 Two football players push against each other The one on the left is 125kg and the one on the right is 200 0 kg a If the left player accelerates at 1 75m s what was the force applied Fema 125 kg x 1 75m s

X Presentation Session Student x Click rdeck com student thwyjong Dylan Young Forg definite Campus F Dylan Young Type a Zoom Link Parent Caps Ms Donohue Science BASD Vitual Acade C Clover PatalGmal habe Maps No picture no points 4 10 pts Two ropes suspend a sign weighing 200 N If the first rope makes an angle of 55 with the sign and the second rope makes an angle of 55 with the sign find the tension in each of the ropes

W 80 60 40 20 5 10 15 20 h m The graph shows a plot of the gravitational potential energy U of a 0 50 kg body as function of its height habove the surface of a planet The acceleration due to gravity at the surface of the planet is 0 m s 1 5 m s 9 8 m s 6 0 m s 30 m s

Analysis 1 What affect does a doubling of the net force have upon the acceleration of the object Be quantitative Don t just say it decreases or increases indicate the factor by which acceleration decreases or increases Identify a set of two trials that support your answer above 2 What affect does a tripling of the net force have upon the acceleration of the object Be quantitative Identify a set of two trials that support your answer above 3 What affect does a doubling of the mass have upon the acceleration of the object Be quantitative Identify a set of two trials that support your answer above 4 What affect does a quadrupling of the mass have upon the acceleration of the object Be quantitative 5 Identify a set of two trials that support your answer above Lab partners Vera and Bill Confuzzens attempted to use Trials 5 and 8 to show the affect that a doubling of force has upon the acceleration Explain why these two trials cannot be used to show the affect of force upon acceleration

3 A 50 0 kg woman riding on a 10 kg cart is moving east at 5 0 m s The woman jumps off the front of the cart and lands on the ground at 7 0 m s eastward What is the final velocity of the cart

2 A 1250 kg car is moving down the highway with a velocity of 32 0 m s when it bumps into the car ahead of it which has a mass of 875 kg and a velocity of 25 0 m s After the collision the two cars stick together What will be the resulting velocity of the two cars together How much energy will be lost in this collision

5 What does the area under the curve of a force time graph represent

A 50 block is moving at a velocity of 8 76 m s on a frictionless surface A constant force F is applied for 3 23 seconds which caused the block to accelerate at a rate of 4 22 m s 2 Find F Round your answer to 2 decimal places Add your answer Question 3 10 Points

If the total mass of the cart is constant then the acceleration will be directly proportional to the net force because of Newton s second law of motion 2 If the net force is constant then the acceleration is inversely proportional to the total mass of the cart because of Newton s second law of motion Therefore when the mass increases the acceleration decreases and when the mass decreases the acceleration increases

A spring loaded ballistic cart measuring 0 57 kg is in contact with a second 0 76 kg cart The carts are initially at rest on a level surface The spring is released and the lighter cart is observed to move at 0 36 m s afterward What is the velocity of the other cart Do NOT round

8 64 Force N 24 do 40 8 1 2 3 4 5 6 7 8 9 10 time s A 4 kg block sliding on a frictionless surface is moving with an initial velocity of 5 m s As impulse is applied to the block as shown on the graph What is the block s speed at time 7 s Do not round

Jimi 100 kg and Tony 80kg stand motionless on ice skates facing each other at arm s length on a smooth frozen pond Tony pushes Jimi with 200 N of force for 0 05 s What is Tony s velocity after after the push Notice this is requiring a veloity Do not round

Cables Practice Problem Uniform weight w 120 N m is supported by a light han cable is 300 N a Determine the value of h at the lowest point in the ca b Determine the value of x at the lowest point in the ca c Clearly mark the location of the cable point where the tension value at that point 5m

Determine the axial force shear force and bending moment at C of the beam 1200 N m

16 How much force is exerted on a 4 kg object accelerating from 10 m s to 12 m s in 2 5 seconds

A 1500 kg roller coaster with its passengers starts from rest at point A on a frictionless track whose profile is shown in the diagram a What is its maximum speed 13 m s b With what speed does the roller coaster arrive at point E 8 9 m s c What constant breaking force would have to be applied to the roller coaster at point E to bring it to rest in a horizontal distance of 5 0 m 12000 N 9 5 m 65 m 9 2 m D 050

baseball of mass 0 14 kg 7 A hockey player shoots a puck at a speed of 150 km h The mass of the puck is 0 16 kg and the player s stick is in contact with it over a distance of 0 25 m Calculate the average force exerted on the puck by the player 560 N mass 3 9 kg across a level floor The coefficient the block begins with a IS

A 9 5 kg box is placed on a conveyor belt that accelerates the box with a constant 1 6m to the right and deliver an total impulse of 16 7 N s to the right How long is the box on the conveyor belt O 12 5 s O 8 1 s 6 4s 1 1

8 3 0 kg diver falls from rest into a Swimming pool from a height of 3 30m It takes 1 66s for the diver to stop after entering the water Find the magnitude of the tha average force exerted on the diver during time

2 Tuo masses M 2 0kg and Me air track with are at rest on an air a compresse spring between them The spring is released the force on M as a function of time is shown Find the speed of My whent 60 0 milliseconds 50 40 20 10 and M 0 37kg O 0 025 0 05 0 075 0 7 in m s 0 12 5 0 15

A box weighing 5 N is resting on a table. A downward force w is exerted by the earth on the book and an upward force n is exerted on the book by the table. The reaction to the force w is a force exerted by the earth on the book a force exerted by the earth on the table a force exerted by the book on the table a force exerted by the book on the earth a force exerted by the table on the book

In a crash test, a car of mass 1.50 x 10³ kg collides with a wall and rebounds. The initial and final velocities of the car are 15.0 m/s [W] and 2.60 m/s [E], respectively. If the collision lasts for 0.150 s, find (a) the impulse delivered to the car due to the collision and [Impulse = 2.64 x 104 kg m/s] (b) the size and direction of the average force exerted on the car. [F=+11.76 x 10³ N ]

A truck's wheel (R = 0.7 m) is traveling at an initial angular velocity of 10.72 rad/s and is constantly decelerating at a rate of 9.1 rad/s². How far in meters will a point on the outer rim of the wheel travel by the time it stops?

A block weighing 8.7 N requires a force of 3.3 N to push it along at constant velocity. What is the coefficient of friction for the surface?

A 100 N force is applied horizontally to a 6.0 kg block of wood. A friction force of 25 N exists between the block and the table it is on. At what rate will the block be accelerated?

A 7.8 kg chandelier is suspended from the ceiling by two chains. The red chain is 96 cm long and the other chain (blue) is 87 cm long. The chains are 1 m apart. Determine the tension on each chain.

While a particle is moving with constant velocity it is acted on by 2 forces. One of the forces is F₁ = -2i +6j. What is the other force?

A 3.50-kg bucket of water is tied to a rope and lifted vertically upward at a constant speed of 1.87 m/s for a displacement of 28.4 m. Determine the work done upon the bucket.

4. Two 0.4 kg pool balls travel in a straight line towards each other. The first pool ball has a velocity of 0.4 m/s to the left and the second has a velocity of 0.6 m/s to the right. If the first pool ball has a velocity of 0.5 m/s to the right, what is the velocity of the second pool ball after the collision? Before After Object 1 Mass Velocity Momentum Object 2 Mass Velocity Momentum

A girl of mass 55 kg throws a ball of mass 0.80 kg against a wall. The ball strikes the wall horizontally with a speed of 25 m/s, and it bounces back with this same speed. The ball is in contact with the wall 0.050 s. What is the magnitude of the average force exerted on the wall by the ball? A) 800 N B) 400 N C) 55,000 N D) 27,500 N E) 13,750 N

A 72 kg person is standing on a bathroom scale (calibrated in newtons) in the middle of an elevator. What is the reading on the scale when the elevator is accelerating upward at a rate of 1.6 m/s²? 820 N 760 N 800 N 740 N

A dad is pulling his son and a load of groceries on two sleds that are connected by a rope. The mass of the boy and sled 1 is 46 kg, and the mass of the groceries and sled 2 is 51 kg. The dad is pulling so that the sleds accelerate at a rate of 0.56 m/s². If the coefficient of kinetic friction between the sleds and the ice is 0.18, what is the tension in the string between them, and with what force are the sleds pulled by dad? (1 Point) 61 N; 120 N 110 N; 120 N 90 N; 220 N 120 N; 220 N

An 8.5 kg block is attached to a weight. The coefficient of static friction between the block and the table is 0.71. What is the minimum mass required for the weight in order to start the block in motion? 4.0 kg 7.0 kg 5.0 kg 6.0 kg

Jennifer hits a stationary 0.20-kg ball, and it leaves her racket at 40 m/s. Time-lapse photography shows that the ball was in contact with the racket for 40 ms. (a) What average force did the ball exert on the racket? (b) What is the ratio of this force to the weight of the ball?

You drop a stone from a position of rest. How far will it fall vertically in the first 8 s? The acceleration of gravity is 9.8 m/s². Answer in units of m. If you instead toss it horizontally at 5 m/s, how far will it fall vertically in the first 8 s?

Two lifeguards pull on ropes attached to a raft. If they pull in the same direction, the raft experiences a net force of 334 N to the right. If they pull in opposite directions, the raft experiences a net force of 106 N to the left. a. Draw a free-body diagram representing the raft for each situation. b. Find the force exerted by each lifeguard on the raft for each situation. (Disregard any other forces acting on the raft.)

Assume: The system shown below starts from rest and there are no frictional forces opposing the motion of the system. The dolly and its wheels have negligible mass. The acceleration of gravity is 9.8 m/s². If a person pulls on the rope with a constant force what is the acceleration of the system? Answer in units of m/s². How far will it move in 3.48 s? Answer in units of m.

Two blocks are connected by a light string that passes over a frictionless pulley as in the figure below. The system is released from rest while m₂ is on the floor and m, is a distance h above the floor. (a) Assuming m, > m₂, find an expression for the speed of m, just as it reaches the floor. (Use any variable or symbol stated above along with the following as necessary: g.) V₁ = (b) Taking m₁ = 6.1 kg, m₂ = 4.4 kg, and h = 3.8 m, evaluate your answer to part (a). m/s (c) Find the speed of each block when m, has fallen a distance of 2.0 m. m/s

Calculate the period of a ball tied to a string of length 0.565 m making 3.6 revolutions every second. Answer in units of s. Your answer must be within +-2.0% Calculate the speed of the ball. Answer in units of m/s. Your answer must be within +-2.0%

Beth, a construction worker, attempts to pull a stake out of the ground by pulling on a rope that is attached to the stake. The rope makes an angle of 63.8° with the horizontal. If Beth exerts a force of 134.5 N on the rope, what is the magnitude of the upward component of the force acting on the stake? Answer in units of N.

2. A box is pulled at a constant speed of 0.40 m/s across a frictional surface. Perform an extensive analysis of the diagram below to determine the values for the blanks.

2. You give a shopping cart a shove down the isle. The cart is full of groceries and has a mass of 18 kg. The cart accelerates at a rate of 3 m/s². How much force did you exert on the cart?

A 0.900 kg ornament is hanging by a 1.50 m wire when the ornament is suddenly hit by a 0.400 kg missile traveling horizontally at 12.0 m/s. The missile embeds itself in the ornament during the collision. Part A What is the tension in the wire immediately after the collision? Express your answer with the appropriate units. T =

Find the x- and y-components of the average force on the ball. Suppose that the + axis is directed to the right, and the +y axis is directed upward. Express your answers in newtons using three significant figures separated by a comma.

A rocket is fired in deep space, where gravity is negligible. In the first second it ejects of its 1/160 mass as exhaust gas and has an acceleration of 14.1 m/s² Part A What is the speed Vgas of the exhaust gas relative to the rocket? Express your answer numerically in kilometers per second.

If a satellite was launched in space and there are NO forces that act on it, then the satellite would If a book is sitting on a table then the book will These examples are examples of Newton's first second third Law of Motion; an object in motion or at rest will then the book will movement or lack of movement until a force acts on it.

Think of a real-life application for Newton's Laws of Motion. Use your knowledge of Newton's Laws of Motion and explain how the laws apply to the real- life phenomena.