Friction Questions and Answers

6. A wooden pallet carrying a load of 600.0 kg rests on a wooden floor. Static mu-0.280 Kinetic mu-0.170 a. A forklift driver decides to push it without lifting it. What force must be applied to just get the pallet moving? b. After a bit of time, the pallet begins to slide. How fast is the pallet moving after sliding under the same force you calculated in part a. for half a second? Hint: Find kinetic force first, determine net force then acceleration. c. If the forklift stops pushing, how far does the pallet slide before coming to a stop? Hint: Use the velocity from (b), kinetic force as net force.

A 10-kg object starts from rest from the top of 2-meter-tall ramp that is inclined at 40⁰ above the x axis. It slides along the rough surface of the incline with the coefficient of kinetic friction 0.20. Using Energy conservati vation a) Find the speed of the object at point B. Then it continues to move along a rough horizontal surface until coming to rest at point C. b) Find the coefficient of kinetic friction for the horizontal surface between B and C if the object stops at C after moving 5 m.

If the object in the diagram has a mass of 14.2 kg, and the applied force has a value of 54.0 N at an angle of 33.0°, and if the value for the coefficient of friction is μ = 0.25, give the net force, acceleration, and direction of motion of the object.

A block is sliding in a straight line along a rough table. The coefficient of friction be- tween the block and the table is mk while it is sliding. The direction of the frictional force points 1. in the direction of the normal force. 2. in the direction of motion. 3. None of these 4. into the table. 5. against the direction of motion.

What can be said about the forces acting on an object that is moving with a constant velocity? The forces acting on the object are unbalanced and the net acceleration is not 0 m/s/s. The forces acting on the object must be in equilibrium and the net acceleration is 0 m/s/s..

A 21 kg block is being dragged over a rough surface with a 190 N force. The block is moving at a constant speed. What is the coefficient of kinetic friction between the block and the rough surface?

Lucy holds a football in place while Charlie Brown attempts to kick it. The mass of the. football is 1 kg and the coefficient of static friction between the football and the ground is 0.70. Assuming Lucy does not pull the ball away, what minimum horizontal force must Charlie Brown apply to the football in order to move it?

A force of 20 N is applied horizontally to a 4.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.30. If the mass is moved a distance of 15 m, what is the change in its kinetic energy? 20 J 61J 46J 124J

The coefficient of friction represents how strong the normal force is. how strong the frictional force is. what direction the frictional force is. Ohow rough the two surfaces are.

A car is parked on a hill. What type of friction is preventing the car from rolling? A car slams on its brakes and skids to a stop. What type of friction is slowing the car down? If the car was parked on snow instead of pavement, the coefficient of friction would be If the mass of the car was increased, the coefficient of friction would be

You are driving at the speed of 29.3 m/s (65.5562 mph) when suddenly the car in front of you (previously traveling at the same speed) brakes and begins to slow down with the largest deceleration possible without skid- ding. Considering an average human reaction, you press your brakes 0.403 s later. You also brake and decelerate as rapidly as possible without skidding. Assume that the coefficient of static friction is 0.774 between both cars' wheels and the road. The acceleration of gravity is 9.8 m/s². Calculate the acceleration of the car in front of you when it brakes. 1.-7.2128 2. -7.0462 3.-8.771 4.-7.8792 5. -8.085 6.-9.0944 7.-8.8592

A block of mass 59.1 kg rests on a slope having an angle of elevation of 26.3°. If pushing downhill on the block with a force just exceeding 182 N and parallel to the slope is sufficient to cause the block to start moving, find the coefficient of static friction.

A 320-g mass and a 400-g mass are attached to the two ends of a string that goes over a pulley with a radius of 8.70 cm. Because of friction, the pulley does not begin to rotate. What is the magnitude of the frictional torque on the bearing of the pulley if the system is in static equilibrium? 0.00683 Nm 0.614 Nm 0.0787 Nm 0.000696 Nm 0.0626 Nm

42.0-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 225 N. For the first 11.0 m the floor is frictionless, and for the next 10.0 m the coefficient of friction is 0.20. What is the final speed of the crate after being pulled these 21.0 m?

A 300 g object is pushed through a length of 80 cm on a tabletop. Coefficient of kinetic friction between the object and tabletop is 0.2. What is the work done by the force of friction during this 80-cm displacement of the object? 0.47 J 0.78 J 0.38 J 0.65 J

You are pushing a shopping cart at Target, fully loaded, with a mass of 46kg. The coefficient of friction between the cart's wheels and the floor is 0.23. How much force do you need to push the cart at constant velocity? Round your answer to the nearest whole number, and do not type in any units.

A large rock has collapsed into a tunnel, barring the group's path forward. Havard, the largest of the adventurers, steps forward and pushes 227 kg rock forward at a constant velocity. Havard pushes forwards with a force of 1000 N. What is the coefficient of friction between the rock and the ground?

A 2 kg book is held against a vertical wall. The coefficient of friction is 0.45. What is the minimum force that must be applied on the book, perpendicular to the wall, to prevent the book from slipping down the wall? Round your answer to the nearest tenth (1 place after the decimal point), and do not type in any units.

John starts pushing on a 100 kg bench with a force of 380 Newtons because he wants to move it down the road. What is the size of the friction force acting on the bench if the coefficient of kinetic friction is 0.2? Round your answer to the nearest whole number.

A 56 kilogram cart is pulled along a horizontal road at constant speed of 2 m/s by a horizontal rope. The coefficient of friction between card and road is 0.69. Find the tension in the rope (the force the rope is applying). Round your answer to the nearest whole number. Do not type in any units.

A coin placed 30.8 cm from the center of a rotating, horizontal turntable slips when its speed is 49.6 cm/s. (a) What force causes the centripetal acceleration when the coin is stationary relative to the turntable? static friction inertia kinetic friction centrifugal force (b) What is the coefficient of static friction between coin and turntable?

Fill in the missing words and values. A child with a weight of 178 N (40 lbs) clings to a steel "fire pole" slide on a playground. What static frictional force is need to support the child? Static friction requires a kinetic N force be present, so the child must squeeze the pole to generate this frictional If the coefficient of friction between skin and steel is 0.800, with what minimum force must the child squeeze the pole in order to remain in place?

An accident victim with a broken leg is being placed in traction. The patient wears a special boot with a pulley attached to the sole. The foot and boot together have a mass of 4.0 kg, and the doctor has decided to hang a m = 6.4 kg mass from the rope. The boot is held suspended by the ropes and does not touch the bed. (Figure 1) ▸ Part A ▸ Part B ▾ Part C What is the net traction force pulling on the leg?

The choice of materials for an exciting playground slide should (1 point) O have a large coefficient of kinetic friction between cloth and the slide material O have a small coefficient of kinetic friction between cloth and the slide material O have a large coefficient of static friction between cloth and the slide material O have a small coefficient of static friction between cloth and the slide material

Sam, whose mass is 71 kg, takes off across level snow on his jet-powered skis. The skis have a thrust of 250 N and a coefficient of kinetic friction on snow of 0.1. Unfortunately, the skis run out of fuel after only 11 s. ▸ Part A Y Part B How far has Sam traveled when he finally coasts to a stop? Express your answer with the appropriate units.

A football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction force on the sled is 1300 N and the angle between the two ropes is 30°. Assume both players pull with the same force. Part A How hard must each player pull to drag the coach at a steady 2.0 m/s? Express your answer with the appropriate units.

Bonnie and Clyde are sliding a 295 kg bank safe across the floor to their getaway car. The safe slides with a constant speed if Clyde pushes from behind with 373 N of force while Bonnie pulls forward on a rope with 363 N of force. Y Part A What is the safe's coefficient of kinetic friction on the bank floor?

A 0.43-kilogram soccer ball sits on the grass. The coefficient of static friction between the soccer ball and the grass is 0.4. A players kicks the ball horizontally, resulting in an initial acceleration of 65 m/s² horizontally. What was the force of static friction applied to the ball at the time of the kick? .4(.43) 10 1.73 f=1.72 N What was the force of the kick? F=m.a/ (43)(65m²²) = 27.950 F=27.95N Imagine the situation was on a different surface like artificial turf, and the coefficient of static friction changed to 0.45. To get the same acceleration, how much more force would the kick need?

The 2.1 kg. 35-cm-diameter disk in (Eigure 1) is spinning at 340 rpm. Part A How much friction force must the brake apply to the rim to bring the disk to a halt in 2.2 s? Express your answer using two significant figures. f = Submit VAX 3 Provide Feedback Request Answer C ? N

A 1500 kg car traveling at a speed of 34 m/s skids to a halt on wet concrete where μ = 0.60. For the steps and strategies involved in solving a similar problem, you may view a Video Tutor Solution. ♥ Part A How long are the skid marks? Express your answer in meters. L = 197

A ski starts from rest and slides down a 28° incline 95 m long. If the coefficient of friction is 0.090, what is the ski's speed at the base of the incline? Express your answer to two significant figures and include the appropriate units.

A 50,000 kg locomotive is traveling at 15 m/s when its engine and brakes both fail. How far will the locomotive roll before it comes to a stop? Assume the track is level. Consult your textbook for any data values you may need.

A 4400 kg truck is parked on a 15 slope. How big is the friction force on the truck? The coefficient of static friction between the tires and the road is 0.90.

Jason works for a moving company. A 45 kg wooden crate is sitting on the wooden ramp of his truck, the ramp is angled at 11°. What is the magnitude of the force, directed parallel to the ramp, that he needs to exert on the crate to get it to start moving up the ramp?

Two roommates are trying to get an armchair into their apartment. They found the armchair did not fit through the front door, so they decide to take it below their patio. One of them is pulling straight upwards with 250 N of force. The other has pressed the armchair against a vertical wall with a force directed upwards at an angle of 30° with respect to the horizontal, as shown. That pushing force has a total magnitude of 300 N. If the armchair is 34 kg, and it is sliding up the wall with an acceleration of 0.5 m/s², what is the coefficient of kinetic friction between the chair and the wall?

During an exam, Rihanna must demonstrate her understanding of fluid friction forces. She is asked to develop an experiment involving a marshmallow and the force of fluid friction. In this experiment, the fluid friction acting on the marshmallow must only act in the upward direction. Which experiment below shows that Rihanna correctly understands the concept of fluid friction forces? A. She throws the marshmallow vertically upward, and allows it to fall back down. B. She stands on a step ladder and drops the marshmallow to the floor. C. She launches the marshmallow horizontally off the edge of a table. D. She launches the marshmallow using a catapult at an angle of 30°.

A block is kept on a truck which has finite coefficient of friction with block. Acceleration of truck is continuously increased. Mark the correct statement. If block starts slipping first, it will never topple. Slipping and toppling must occur simultaneously. Slipping and toppling must not occur simultaneously. Slipping will always happen before toppling

You are moving into a new place, and you rented a U-Haul cargo van to transport your home furniture and different boxes. Moving the boxes from the house to the van is done through a dolly you are using. However, the dolly has broken during a move. There are still several boxes which must now be carried manually from the home to the van. The ramp leading into the mover's van is at a 30° angle to the ground. You are carrying a box weighing 200 N from the house. You are placing the box on the ramp, planning to push it the rest of the way into the van. a) Given the diagram below, use arrows to indicate the directions of the frictional force, the gravitational force and the normal force (perpendicular to the incline) of a box sitting on a ramp. b) You can push the box with a force of 200 N parallel to the ramp, but the box does not move. Determine: i) the components of the weight parallel to and normal to the direction of the ramp. ii) the frictional force.

1. A sled of mass 62.0 kg is pulled along snow-covered flat ground. The static friction coefficient is 0.300 and the kinetic friction coefficient is 0.100, a) What minimum force will be needed to start the sled moving? b) What force is needed to keep the sled moving at a constant speed? c) Once moving, what force will be needed to accelerate the sled at a rate of 2.50 m/s²?

Three blocks of mass m, 2m, and 3m are being pushed to the right at a constant speed with a force of 12N. The force of kinetic friction on m is 2.0N, the force of kinetic friction on 2m is 4.0N, and the force of kinetic friction on 3m is 6.ON.

A rightward force of 302 N is applied to a 28 6-kg crate to accelerate it across the floor. The coefficient of friction between the crate and the floor is 0.750. Determine the acceleration of the crate

A rightward force of 302 N is applied to a 25 6-kg crate to accelerate it across the floor. The coefficient of friction between the crate and the floor is 750. Determine the acceleration of the crate

The children had been splashing in the pool all day. Their father was surprised that he could drag the plastic wading pool over, the wet grass if he gave it a jerk to get it started. Assume the coefficient of sliding friction is now 0.08. How much force must he apply to the 4,050 N pool (and water) once it is moving?

A 4-kg object is moved along a rough surface inclined at 15° downward at a constant speed as the result of the applied horizontal force. The coefficient of kinetic friction between the surface and the object is 0.25. Find a) the magnitude of the applied force. b) What is the magnitude of the applied force F for the object to move up with acceleration 2 m/s^2.

Suction cup hooks are placed against a smooth surface such as glass. The hooks remain in place and can hold up light objects. a) What force holds the hooks up? b) Why is it important that they are placed on a smooth surface.

When two objects slide against one another, which of the following statements about the force of friction between them is true? The magnitude of the frictional force is always equal to µkn. The magnitude of the frictional force is always less than µkn. The magnitude of the frictional force is determined by other forces on the objects so it can be either equal to or less than µkn.

A child goes down a playground slide with an acceleration of 1.34 m/s². Find the coefficient of kinetic friction between the child and the slide if the slide is inclined at an angle of 30.0° below the horizontal.

Which of these is an example of sliding friction? A. a flying kite pushed by a gentle breeze B. a badminton shuttlecock flying over the net C. a basketball rolling across a wooden floor D. a hockey puck moving across the ice

A 3 kg block is being pushed on a rough floor by a 2 N force acting to the right. It has an acceleration of 0.25 m/s2 to the left. How large is the force of friction acting on the block?

A marble, a hoop bracelet, a tube of lip balm, and a rectangular jewelry box are released from the top of a steeply inclined piece of wood. Which object would NOT experience a rolling friction force as it moved down the incline? A. tube of lip balm B. hoop bracelet C. rectangular jewelry box D. marble