HESI A2 test Physic - Friction
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20 Terms
Which of the following forces is depicted in the image below?
Normal force
Which of the following forces is a type of contact force that opposes the motion of a body when it comes in contact with another surface?
Frictional force
Arrange the following frictional forces in decreasing order of their strength: static, sliding, rolling.
Static friction > Sliding friction > Rolling friction
A block of mass 22 kg is placed on a table with a coefficient of friction equal to 0.3. What is the frictional force on the block?
64.68 N
An object of mass 53 kg is on the ground. If the coefficient of friction between the object and the ground is 0.7, what is the frictional force on the object?
363.58 N
A box of mass 72 kg is moving across an uneven surface. If the frictional force experienced by the block is 565 N, what is the coefficient of friction between the box and the surface?
μ = 0.8
An object of mass 552 g is moving across a surface and experiences a frictional force of 1.6 N. What is the coefficient of friction between the object and the surface it is moving across?
μ = 0.3
A car is moving on a road and experiences a frictional force of 7,644 N. If the coefficient of friction between the car and the road is 0.6, what is the car’s mass?
1,300 kg
A box is being dragged on the ground and experiences a friction force of 420 N. If the coefficient of friction between the box and the ground is 0.4, what is the mass of the box?
107.14 kg
A block of mass 5 kg rests on top of a table. An external force of 12 N is applied to the box towards the right. If the coefficient of friction between the block and the table is 0.5, find the net force acting on the block.
12.5 N towards the left
A refrigerator of mass 130 kg is pushed to the right with a force of 540 N when it is on the ground. If the coefficient of friction between the ground and the refrigerator is 0.5, what is the net force on the refrigerator?
97 N towards the left
An object of mass 20 kg is kept on a highly irregular and rough surface. A force of 35 N is applied to the body towards the left. If the coefficient of friction between the surface and the object is 0.91, what is the net force on the object?
143.36 N towards the right
A box of mass 62 kg is being pulled with a force of 120 N along the ground. If the coefficient of friction between the box and the ground is 0.6, what is the magnitude of the net force on the box, and will the box move?
Fnet= – 244.56 N, the box will not move.
A book of mass 2 kg lies on a table. It is pushed with a force of 63 N. If the coefficient of friction between the book and table is 0.3, what is the net force on the book? Will the book move against the frictional force?
Fnet = 57.12 N, the book will move against the frictional force.
A car of mass 1,350 kg is moving with a uniform acceleration of 18 m/s2 when it encounters a rocky road. If the coefficient of friction on this road is 0.8, what is the net force on the car? Will it continue to move on this road?
F = 13,716 N, the car will continue to move on the rocky road.
An object of mass 24 kg is moving with a uniform acceleration of 25 m/s2 when it suddenly starts moving on an irregular surface. If the coefficient of friction between the surface and the object is 0.6, what is the net force on the object? Will it continue to move on the irregular surface?
F = 458.88 N, the object will continue to move on the irregular surface.
A cyclist of mass 56 kg is riding a bicycle of mass 2 kg. The cyclist is traveling at a uniform acceleration of 8 m/s2 on a smooth, frictionless road. After some time, the cyclist encounters a rough road with a coefficient of friction of 0.7. Will the cyclist be able to continue riding on this road with the same acceleration? What is the net force on the cyclist?
F = 66.12 N, the cyclist will continue to move on the rough road.
A block of mass 5 kg is moving on a surface with a coefficient of friction equal to 0.5. If the initial acceleration of the body before it starts moving on this surface is 10 m/s2, what is the deceleration of the block due to frictional forces?
-5 m/s2
A biker of mass 58 kg is traveling with a uniform acceleration of 25 m/s2 when he suddenly encounters a rocky street. If the coefficient due to friction of this surface is 0.7, what is the declaration of the biker due to frictional forces?
-18.14 m/s2
A 160-g coin moves with an acceleration of 8 m/s2 when it starts moving on a rough patch on a wooden board. If the coefficient of friction of this rough patch is 0.4, what is the deceleration of the coin due to frictional forces?
-4 m/s2