Question 1

Which of the following statements is TRUE regarding inertia?

Accepted Answer

An object's inertia depends on its mass.

Question 2

A block of mass $$0.30\ \mathrm{kg}$$ slides on a horizontal table and is connected by a string over a frictionless pulley to another block of the same mass hanging vertically, as shown in the first image. If the hanging block falls $$0.80\ \mathrm{m} in$$ $$2.5\ \mathrm{s}$$, what is the coefficient of kinetic friction $$\mu_k$$ between the table and the sliding block?

Accepted Answer

$$\mu_k = 0.13$$

Question 3

Which of the following is correct about the acceleration of an object according to Newton's Second Law?

Accepted Answer

The acceleration of an object is inversely proportional to its mass.

Question 4

A block of mass $$m = 11.0\ \mathrm{kg}$$ rests on a frictionless surface. Two forces act on it: $$F_1 = 11.5$$\ \mathrm{N}$$ to the left and F_2$ = 10.0\ \mathrm{N} at$$ $$	heta = 11.0^\circ$$ above the horizontal to the left (see second image). What is the net force in the $$x-$$direction?

Accepted Answer

$$-1.8\ \mathrm{N}$$

Question 5

Which of the following statements about friction is TRUE?

Accepted Answer

Kinetic friction depends on both the type of surfaces in contact and the normal force.

Question 6

A 28-kg traffic light is suspended by two cables as shown in the third image. What is the tension in cable 1 (making a $$30^\circ$$ angle with the horizontal)?

Accepted Answer

$$T_1 = 274$$\ \mathrm{N}$$

Question 7

Which of the following is TRUE about an object in free fall near Earth's surface?

Accepted Answer

It experiences a constant gravitational force directed downward.

Question 8

A crate of mass $$m = 2.0\ \mathrm{kg} is on a $$frictionless incline at $$	heta = 22^\circ ($$see fourth image). If a force $$F is $$applied parallel to the incline to accelerate the crate upward at $$1.2\ \mathrm{m/s^2$}$$, what is the normal force on the crate?

Accepted Answer

$$N = 18.2\ \mathrm{N}$$

Question 9

Which of the following best describes the effect of changing the direction of an object's velocity?

Accepted Answer

It affects both the velocity and the acceleration.

Question 10

A hockey puck is hit on a perfectly frictionless ice surface and loses contact with the stick. What happens to the puck after it leaves the stick (ignore air resistance)?

Accepted Answer

It moves at constant velocity.

Question 11

Which of the following statements about tension force is correct?

Accepted Answer

Tension force can be affected by the angle of the rope relative to the horizontal.

Question 12

A block of mass $$m is on a $$frictionless surface. Two forces act on it: $$F_1 to $$the left and $$F_2 at an $$angle $$	heta$$ above the horizontal to the left. What is the normal force $$N$$ acting on the block?

Accepted Answer

$$N = mg - F_2$ \sin 	heta$$

Question 13

Which of the following is TRUE about static friction?

Accepted Answer

Static friction ceases to exist once the object starts moving.

Question 14

A car is being towed at constant velocity on a horizontal road using a horizontal chain. Which of the following is TRUE?

Accepted Answer

The tension in the chain must be equal to the frictional force opposing the motion.

Question 15

Which of the following best describes the relationship between the force you apply to an object and the force it applies back on you?

Accepted Answer

The forces are always equal in magnitude and opposite in direction.

Question 16

A crate of mass $$m = 2.0\ \mathrm{kg} is on a $$frictionless incline at $$	heta = 22^\circ. If $$the crate accelerates up the incline at $$1.2\ \mathrm{m/s^2$}$$, what is the magnitude of the applied force $$F$$ parallel to the incline?

Accepted Answer

$$F = 13.2\ \mathrm{N}$$

Physics with Calculus: Forces, Friction, and Dynamics Study Guide

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