Question 1

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 2

Which of the following best describes the difference between static and kinetic friction?

Accepted Answer

Static friction acts to prevent motion, while kinetic friction acts during motion.

Question 3

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 4

Which equation correctly relates displacement ($$\Delta x$$), initial velocity ($$v_0$$), time ($$t$$), and acceleration ($$a) $$for constant acceleration?

Accepted Answer

$$\Delta x = v_0$ t + \frac{1}{2} a t^2$

Question 5

A $$3\ \mathrm{kg}$$ block is pulled across a horizontal surface with a force of $$15\ \mathrm{N}. If $$the coefficient of kinetic friction is $$0.2$$, what is the acceleration of the block? ($$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$3.0\ \mathrm{m/s^2$}$$

Question 6

Which of the following is the correct expression for centripetal acceleration for an object moving in a circle of radius $$r at $$speed $$v$$?

Accepted Answer

$$a_c = \frac{v^2$}{r}$$

Question 7

A ball is thrown straight up with an initial velocity of $$12\ \mathrm{m/s}. $$What is the maximum height it reaches? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$7.35\ \mathrm{m}$$

Question 8

Which statement about Newton's Third Law is correct?

Accepted Answer

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

Question 9

A $$0.5\ \mathrm{kg}$$ object moves in a circle of radius $$2\ \mathrm{m} at a $$speed of $$4\ \mathrm{m/s}. $$What is the magnitude of the centripetal force?

Accepted Answer

$$4\ \mathrm{N}$$

Question 10

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

Accepted Answer

$$v = \sqrt{2gh}$$

Question 11

A $$10\ \mathrm{kg}$$ box is at rest on a horizontal surface. The coefficient of static friction is $$0.4. $$What is the minimum force required to start moving the box? ($$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$39.2\ \mathrm{N}$$

Question 12

Which of the following is NOT a valid kinematic equation for constant acceleration?

Accepted Answer

$$\Delta x = v_0$ t + a t$$

Question 13

A $$2\ \mathrm{kg}$$ object is attached to a string and swung in a horizontal circle of radius $$1.5\ \mathrm{m} at$$ $$3\ \mathrm{m/s}. $$What is the tension in the string?

Accepted Answer

$$12\ \mathrm{N}$$

Question 14

A person pushes a $$5\ \mathrm{kg}$$ box across a floor with a force of $$30\ \mathrm{N} at an $$angle of $$30^\circ$$ below the horizontal. What is the horizontal component of the force?

Accepted Answer

$$25.98\ \mathrm{N}$$

Question 15

A $$1\ \mathrm{kg}$$ object is dropped from a height of $$10\ \mathrm{m}. $$What is its velocity just before hitting the ground? (Ignore air resistance, $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

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

Question 16

Which of the following best describes the net force acting on an object moving at constant velocity?

Accepted Answer

The net force is zero.

Question 17

A $$0.2\ \mathrm{kg}$$ ball moves in a circle of radius $$0.5\ \mathrm{m} at$$ $$2\ \mathrm{m/s}. $$What is the centripetal acceleration?

Accepted Answer

$$8\ \mathrm{m/s^2$}$$

Question 18

A $$4\ \mathrm{kg}$$ object is acted on by a net force of $$20\ \mathrm{N}. $$What is its acceleration?

Accepted Answer

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

Question 19

A $$6\ \mathrm{kg}$$ block slides down a $$30^\circ$$ incline. What is the component of its weight parallel to the incline? ($$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$29.4\ \mathrm{N}$$

Fundamentals of Mechanics: Kinematics, Dynamics, and Circular Motion

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