AP®︎ Physics 1: Topic 2.7 Practice Test

Prepare for your quiz, test, or the AP exam with focused practice questions on Topic 2.7 of AP Physics 1 – Kinetic and Static Friction.

Questions List

Topic 2.7

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Question 1 Easy

A block slides to the right across a rough, level floor. Which of the following describes the frictional force exerted by the block on the floor?
ATo the right, smaller than the frictional force exerted by the floor on the block, because the floor is more massive.
BTo the right, equal in magnitude to the frictional force exerted by the floor on the block.
CTo the left, equal in magnitude to the frictional force exerted by the floor on the block.
DZero, because the floor does not move.

What You’re Being Tested On:

Explore the learning objectives taken directly from the College Board’s AP® Physics 1 Curriculum. Ensure you’re prepared for the exact topics covered on the AP® exam, in-class tests, and quizzes, and gain confidence in your mastery of the material.

Topic 2.7: Kinetic and Static Friction

Learning Objective: 2.7.A

Describe kinetic friction between two surfaces

Essential Knowledge: 2.7.A.1

Kinetic friction occurs when two surfaces in contact move relative to each other.

Essential Knowledge: 2.7.A.1.i

The kinetic friction force is exerted in a direction opposite to the motion of each surface relative to the other surface.

Essential Knowledge: 2.7.A.1.ii

The force of friction between two surfaces does not depend on the size of the surface area of contact.

Essential Knowledge: 2.7.A.2

The magnitude of the kinetic friction force exerted on an object is the product of the normal force the surface exerts on the object and the coefficient of kinetic friction. Relevant equation: ∣F⃗f,k∣=∣μkF⃗n∣\left|\vec{F}_{f,k}\right|=\left|\mu_k\vec{F}_n\right|

Essential Knowledge: 2.7.A.2.i

The coefficient of kinetic friction depends on the material properties of the surfaces that are in contact.

Essential Knowledge: 2.7.A.2.ii

Normal force is the perpendicular component of the force exerted on an object by the surface with which it is in contact; it is directed away from the surface.

Learning Objective: 2.7.B

Describe static friction between two surfaces.

Essential Knowledge: 2.7.B.1

Static friction may occur between the contacting surfaces of two objects that are not moving relative to each other.

Essential Knowledge: 2.7.B.2

Static friction adopts the value and direction required to prevent an object from slipping or sliding on a surface. Relevant equation: ∣F⃗f,s∣≤∣μsF⃗n∣\left|\vec{F}_{f,s}\right|\le\left|\mu_s\vec{F}_n\right|

Essential Knowledge: 2.7.B.2.i

Slipping and sliding refer to situations in which two surfaces are moving relative to each other.

Essential Knowledge: 2.7.B.2.ii

There exists a maximum value for which static friction will prevent an object from slipping on a given surface. Derived equation: Ff,s,max=μsFnF_{f,s,\mathrm{max}}=\mu_sF_n

Essential Knowledge: 2.7.B.3

The coefficient of static friction is typically greater than the coefficient of kinetic friction for a given pair of surfaces.

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