Question 1

Which of the following is the correct SI unit for acceleration?

Accepted Answer

$$\mathrm{m/s^2$}$$

Question 2

A car travels 100 meters north in 5 seconds, then 100 meters south in 5 seconds. What is the car's average speed and average velocity over the 10 seconds?

Accepted Answer

Average speed: $$20\ \mathrm{m/s}$$, Average velocity: $$0\ \mathrm{m/s}$$

Question 3

Which of the following equations is dimensionally consistent for force?

Accepted Answer

$$F = m \cdot a$$

Question 4

A ball is thrown straight up with an initial velocity of $$10\ \mathrm{m/s}. $$Neglecting air resistance, what is the maximum height it reaches? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$5.1\ \mathrm{m}$$

Question 5

Which of the following best describes the difference between distance and displacement?

Accepted Answer

Distance is the total path length, displacement is the straight-line change in position.

Question 6

A 2 kg object is acted on by a net force of $$10\ \mathrm{N}. $$What is its acceleration?

Accepted Answer

$$5\ \mathrm{m/s^2$}$$

Question 7

Which of the following statements about Newton's Third Law is correct?

Accepted Answer

Action and reaction forces are always equal in magnitude and opposite in direction.

Question 8

A block slides down a frictionless incline of height $$h. $$What is its speed at the bottom?

Accepted Answer

$$\sqrt{2gh}$$

Question 9

A 5 kg box is pulled across a horizontal surface with a force of $$20\ \mathrm{N}$$, and the coefficient of kinetic friction is $$0.2. $$What is the acceleration of the box? (Use $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$2.0\ \mathrm{m/s^2$}$$

Question 10

Which of the following best describes the role of a free-body diagram in solving Newton's second law problems?

Accepted Answer

It helps identify and sum all forces acting on the object.

Question 11

A car accelerates uniformly from rest to $$20\ \mathrm{m/s} in$$ $$10\ \mathrm{s}. $$What is the car's acceleration?

Accepted Answer

$$0.5\ \mathrm{m/s^2$}$$

Question 12

Which of the following is the correct dimensional formula for energy?

Accepted Answer

$$ML^2T$$^{-2}$

Question 13

A 10 kg object is at rest on a horizontal surface. What is the normal force acting on it? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$98\ \mathrm{N}$$

Question 14

If the net force on an object is zero, which of the following must be true?

Accepted Answer

The object is moving at constant velocity or at rest.

Question 15

A 1 kg ball is dropped from a height of 20 m. Neglecting air resistance, what is its speed just before hitting the ground? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$14.0\ \mathrm{m/s}$$

Question 16

Which of the following is the correct relationship for static friction?

Accepted Answer

$$f_s \leq \mu_s N$$

Question 17

A velocity vs. time graph for an object is a straight line with a positive slope. What does this indicate about the object's motion?

Accepted Answer

The object is accelerating at a constant rate.

Question 18

Which of the following best describes the direction of the frictional force acting on a moving object?

Accepted Answer

Opposite to the direction of motion.

Question 19

Dimensional analysis can be used to:

Accepted Answer

Check the correctness of equations.

Question 20

A 3 kg object is moving with a velocity of $$4\ \mathrm{m/s}. $$What is its momentum?

Accepted Answer

$$12\ \mathrm{kg\cdot m/s}$$

Fundamental Concepts in College Physics: Math, Kinematics, and Forces

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