Question 1

A car travels 120 km in 2.5 hours. What is its average speed in meters per second ($$\mathrm{m/s}$$)?

Accepted Answer

$$13.3\ \mathrm{m/s}$$

Question 2

Which of the following quantities is a vector?

Accepted Answer

Displacement

Question 3

A ball is thrown horizontally from a $$20\ \mathrm{m}$$ high cliff with an initial speed of $$5\ \mathrm{m/s}. $$How far from the base of the cliff does the ball land? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$10.1\ \mathrm{m}$$

Question 4

The area under a velocity vs. time graph represents:

Accepted Answer

Displacement

Question 5

A box is pulled across a horizontal surface with a force of $$30\ \mathrm{N} to $$the right. The frictional force is $$10\ \mathrm{N} to $$the left. If the box has a mass of $$5\ \mathrm{kg}$$, what is its acceleration?

Accepted Answer

$$4\ \mathrm{m/s^2$}$$

Question 6

Which of Newton’s Laws explains why passengers lurch forward in a car when it suddenly stops?

Accepted Answer

Newton's First Law

Question 7

A $$10\ \mathrm{kg}$$ box rests on a ramp inclined at $$30^\circ to $$the horizontal. What is the component of the gravitational force acting down the ramp? ($$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$49\ \mathrm{N}$$

Question 8

Which statement about static and kinetic friction is correct?

Accepted Answer

The coefficient of static friction is always greater than kinetic friction.

Question 9

A $$60\ \mathrm{kg}$$ skydiver reaches terminal speed during free fall. Which statement is true at terminal speed?

Accepted Answer

The upward force of air resistance equals the downward force of gravity.

Question 10

A $$5\ \mathrm{kg}$$ block is suspended by a rope. What is the tension in the rope if the block is at rest? ($$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$49\ \mathrm{N}$$

Question 11

A $$2\ \mathrm{kg}$$ object is in contact with a $$3\ \mathrm{kg}$$ object on a frictionless surface. A $$10\ \mathrm{N}$$ force is applied to the $$2\ \mathrm{kg}$$ object. What is the force exerted by the $$3\ \mathrm{kg}$$ object on the $$2\ \mathrm{kg}$$ object?

Accepted Answer

$$6\ \mathrm{N}$$

Question 12

A $$70\ \mathrm{kg}$$ person stands on a scale in an elevator accelerating upward at $$2\ \mathrm{m/s^2$}. $$What does the scale read?

Accepted Answer

$$840\ \mathrm{N}$$

Question 13

A projectile is launched at $$20\ \mathrm{m/s} at an $$angle of $$30^\circ$$ above the horizontal. What is the initial vertical component of its velocity?

Accepted Answer

$$10\ \mathrm{m/s}$$

Question 14

Which of the following best describes Newton’s Third Law?

Accepted Answer

For every action, there is an equal and opposite reaction.

Question 15

A $$4\ \mathrm{kg}$$ block is pulled up a $$30^\circ$$ incline with a force parallel to the incline. If the coefficient of kinetic friction is $$0.2$$, what is the frictional force?

Accepted Answer

$$6.8\ \mathrm{N}$$

Question 16

A velocity vs. time graph has a constant positive slope. What does this indicate about the object's motion?

Accepted Answer

The object is accelerating at a constant rate.

Question 17

A $$10\ \mathrm{kg}$$ box is at rest on a horizontal surface. The coefficient of static friction is $$0.5. $$What is the minimum force required to start moving the box? ($$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$49\ \mathrm{N}$$

Question 18

A $$2\ \mathrm{kg}$$ mass is attached to a string and swung in a horizontal circle at constant speed. If the string breaks, what path does the mass follow?

Accepted Answer

It moves in a straight line tangent to the circle.

Question 19

A person pushes a $$15\ \mathrm{kg}$$ box across a floor with a force of $$60\ \mathrm{N}. $$The box moves at constant velocity. What is the coefficient of kinetic friction?

Accepted Answer

$$0.41$$

Question 20

A $$3\ \mathrm{kg}$$ and a $$7\ \mathrm{kg}$$ block are connected by a light string over a frictionless pulley. If the system is released from rest, what is the acceleration of the blocks? ($$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$4.9\ \mathrm{m/s^2$}$$

College Physics I Midterm I Review: Motion, Forces, and Applications

Study Guide - Practice Questions

Study Guide - Flashcards