Question 1

Which of the following best describes Newton's First Law of Motion?

Accepted Answer

An object will remain at rest or in uniform motion in a straight line unless acted upon by a net external force.

Question 2

A car accelerates from rest at a constant rate of $$2\ \mathrm{m/s^2$}$$ for $$5\ \mathrm{s}. $$What is its final velocity?

Accepted Answer

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

Question 3

Which of the following is a vector quantity?

Accepted Answer

Displacement

Question 4

A projectile is launched horizontally from a $$20\ \mathrm{m}$$ high cliff with a speed of $$5\ \mathrm{m/s}. $$How long does it take to hit the ground? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$2.02\ \mathrm{s}$$

Question 5

Which equation correctly expresses the work done by a constant force $$\vec{F}$$ acting over a displacement $$\vec{d}$$?

Accepted Answer

$$W = \vec{F} \cdot \vec{d}$$

Question 6

A $$3\ \mathrm{kg}$$ object moves in a circle of radius $$2\ \mathrm{m} at a $$constant speed of $$4\ \mathrm{m/s}. $$What is the magnitude of the centripetal force acting on it?

Accepted Answer

$$24\ \mathrm{N}$$

Question 7

Which of the following statements about momentum is correct?

Accepted Answer

Momentum is always conserved in an isolated system.

Question 8

A $$0.5\ \mathrm{kg}$$ ball is dropped from a height of $$10\ \mathrm{m}. $$What is its speed just before hitting the ground? (Neglect air resistance, $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$14\ \mathrm{m/s}$$

Question 9

Which of the following best describes the principle of conservation of mechanical energy?

Accepted Answer

The total mechanical energy (kinetic plus potential) of a system remains constant if only conservative forces act.

Question 10

A $$2\ \mathrm{kg}$$ block slides down a frictionless incline of height $$5\ \mathrm{m}. $$What is its speed at the bottom?

Accepted Answer

$$9.9\ \mathrm{m/s}$$

Question 11

Which of the following is NOT a requirement for static equilibrium?

Accepted Answer

The net torque on the object must be nonzero.

Question 12

A $$1\ \mathrm{kg}$$ object moving at $$3\ \mathrm{m/s}$$ collides elastically with a stationary $$2\ \mathrm{kg}$$ object. What is the velocity of the $$1\ \mathrm{kg}$$ object after the collision?

Accepted Answer

$$-1\ \mathrm{m/s}$$

Question 13

Which of the following equations gives the acceleration of an object sliding down an inclined plane of angle $$	heta ($$neglecting friction)?

Accepted Answer

$$a = g \sin 	heta$$

Question 14

A force of $$10\ \mathrm{N} is $$applied to a $$2\ \mathrm{kg}$$ object for $$4\ \mathrm{s}. $$What is the change in momentum of the object?

Accepted Answer

$$40\ \mathrm{kg \cdot m/s}$$

Question 15

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is a measure of the amount of matter in an object, while weight is the force of gravity acting on that mass.

Question 16

A rotating disk has an angular velocity of $$6\ \mathrm{rad/s}$$ and a moment of inertia of $$2\ \mathrm{kg \cdot m^2$}. $$What is its rotational kinetic energy?

Accepted Answer

$$36\ \mathrm{J}$$

Question 17

A student pushes a box across a rough floor at constant speed. Which statement is true about the forces acting on the box?

Accepted Answer

The applied force is equal in magnitude and opposite in direction to the frictional force.

Question 18

Which of the following is the correct expression for gravitational potential energy near Earth's surface?

Accepted Answer

$$U = mgh$$

Question 19

A $$5\ \mathrm{kg}$$ object is acted on by a net force of $$15\ \mathrm{N}. $$What is its acceleration?

Accepted Answer

$$3\ \mathrm{m/s^2$}$$

Question 20

A ball is thrown straight up with an initial velocity of $$20\ \mathrm{m/s}. $$What is the maximum height it reaches? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$20.4\ \mathrm{m}$$

Physics 1020 – Introductory Physics I: Course Overview and Structure

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