Question 1

A car accelerates uniformly from rest and travels a distance of $$100\ \mathrm{m} in$$ $$5\ \mathrm{s}. $$What is the magnitude of its acceleration?

Accepted Answer

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

Question 2

Given the equation $$v = v_0$ + at$$, which of the following best describes the physical meaning of $$a$$?

Accepted Answer

The rate of change of velocity with respect to time.

Question 3

A ball is thrown straight up with an initial velocity of $$20\ \mathrm{m/s}. $$Neglecting air resistance, how long does it take to reach its maximum height? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$2.04\ \mathrm{s}$$

Question 4

A vector has components $$A_x = 3$$ and $$A_y = 4. $$What is the magnitude of the vector?

Accepted Answer

$$5$$

Question 5

A projectile is launched at an angle of $$30^\circ$$ above the horizontal with an initial speed of $$40\ \mathrm{m/s}. $$What is the horizontal component of its velocity?

Accepted Answer

$$34.6\ \mathrm{m/s}$$

Question 6

A $$2\ \mathrm{kg}$$ object is moving with a velocity of $$5\ \mathrm{m/s}. $$What is its kinetic energy?

Accepted Answer

$$25\ \mathrm{J}$$

Question 7

A $$10\ \mathrm{kg}$$ box is pulled up a $$30^\circ$$ incline with a coefficient of kinetic friction $$\mu_k = 0.2. If $$the box moves at constant speed, what is the magnitude of the frictional force?

Accepted Answer

$$16.97\ \mathrm{N}$$

Question 8

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

Accepted Answer

An object at rest remains at rest and an object in motion remains in motion at constant velocity unless acted upon by a net external force.

Question 9

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

$$826\ \mathrm{N}$$

Question 10

A force of $$10\ \mathrm{N} is $$applied to push a box $$3\ \mathrm{m}$$ along a horizontal surface. How much work is done by the force?

Accepted Answer

$$30\ \mathrm{J}$$

Question 11

Given the equation $$s = ut + \frac{1}{2}at^2$, what is the dimension of a$?

Accepted Answer

$$\mathrm{L\ T$$^{-2}$$}$$

Question 12

A car travels $$60\ \mathrm{km}$$ north, then $$80\ \mathrm{km}$$ east. What is the magnitude of its displacement?

Accepted Answer

$$100\ \mathrm{km}$$

Question 13

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

Accepted Answer

The object moves with constant velocity or remains at rest.

Question 14

A $$5\ \mathrm{kg}$$ object 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 15

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

Accepted Answer

$$\sqrt{2gh}$$

Question 16

A $$3\ \mathrm{kg}$$ object is moving at $$4\ \mathrm{m/s} to $$the right. A $$2\ \mathrm{kg}$$ object is moving at $$6\ \mathrm{m/s} to $$the left. What is the total momentum of the system?

Accepted Answer

$$0\ \mathrm{kg\cdot m/s}$$

Question 17

A force $$F is $$applied at an angle $$	heta to $$the direction of displacement $$d. $$Which formula gives the work done by the force?

Accepted Answer

$$W = Fd\cos	heta$$

Question 18

A $$1\ \mathrm{kg}$$ object is attached to a spring and oscillates with a frequency of $$2\ \mathrm{Hz}. $$What is the period of oscillation?

Accepted Answer

$$0.5\ \mathrm{s}$$

Question 19

A car accelerates from $$10\ \mathrm{m/s} to$$ $$30\ \mathrm{m/s} in$$ $$5\ \mathrm{s}. $$What is its acceleration?

Accepted Answer

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

Question 20

A $$0.5\ \mathrm{kg}$$ ball is thrown horizontally at $$10\ \mathrm{m/s}$$ from a $$20\ \mathrm{m}$$ high cliff. How far from the base of the cliff does the ball land? (Neglect air resistance, $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$20.2\ \mathrm{m}$$

Fundamental Concepts in Physics: Motion, Forces, and Energy

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