Question 1

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

Accepted Answer

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

Question 2

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

Accepted Answer

An object in motion will remain in motion unless acted upon by an external force.

Question 3

A ball is thrown vertically upward with an initial velocity of $$15 \ \mathrm{m/s}. $$Ignoring air resistance, what is the maximum height reached by the ball? (Use $$g = 9.8 \ \mathrm{m/s^2$})$$

Accepted Answer

$$11.5 \ \mathrm{m}$$

Question 4

Which of the following scenarios best illustrates Newton's Third Law?

Accepted Answer

A swimmer pushes water backward and moves forward.

Question 5

A $$5 \ \mathrm{kg}$$ object is acted upon by a net force of $$20 \ \mathrm{N}. $$What is its acceleration?

Accepted Answer

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

Question 6

A satellite orbits Earth in a circular path. Which force is responsible for keeping it in orbit?

Accepted Answer

Gravitational force

Question 7

A $$2 \ \mathrm{kg}$$ block slides down a frictionless incline of height $$3 \ \mathrm{m}. $$What is its speed at the bottom?

Accepted Answer

$$7.7 \ \mathrm{m/s}$$

Question 8

Which equation represents the work done by a constant force $$F$$ acting over a displacement $$d at an $$angle $$	heta to $$the direction of the force?

Accepted Answer

$$W = F d \cos 	heta$$

Question 9

A $$0.5 \ \mathrm{kg}$$ ball moving at $$4 \ \mathrm{m/s}$$ collides elastically with a stationary $$0.5 \ \mathrm{kg}$$ ball. What is the velocity of the first ball after the collision?

Accepted Answer

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

Question 10

Which of the following is a correct statement about conservation of energy in a closed system?

Accepted Answer

The total energy remains constant over time.

Question 11

A $$3 \ \mathrm{kg}$$ object moving at $$2 \ \mathrm{m/s}$$ collides inelastically with a $$2 \ \mathrm{kg}$$ object at rest. What is the final velocity of the combined mass?

Accepted Answer

$$1.2 \ \mathrm{m/s}$$

Question 12

A $$10 \ \mathrm{kg}$$ box is pushed across a floor with a force of $$50 \ \mathrm{N} at an $$angle of $$30^\circ to $$the horizontal. What is the horizontal component of the force?

Accepted Answer

$$43.3 \ \mathrm{N}$$

Question 13

Which of the following best describes the difference between elastic and inelastic collisions?

Accepted Answer

Elastic collisions conserve both kinetic energy and momentum, while inelastic collisions conserve only momentum.

Question 14

A $$0.2 \ \mathrm{kg}$$ ball is swung in a circle of radius $$0.5 \ \mathrm{m} at a $$speed of $$3 \ \mathrm{m/s}. $$What is the centripetal force acting on the ball?

Accepted Answer

$$3.6 \ \mathrm{N}$$

Question 15

Which of the following equations gives the gravitational force between two masses $$m_1$$ and $$m_2$$ separated by distance $$r$$?

Accepted Answer

$$F = G \frac{m_1$ m_2$}{r^2$}$$

Question 16

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

Accepted Answer

$$19.8 \ \mathrm{m/s}$$

Question 17

Which of the following statements about friction is correct?

Accepted Answer

Friction always acts opposite to the direction of motion.

Question 18

A $$0.3 \ \mathrm{kg}$$ object moving at $$5 \ \mathrm{m/s}$$ has what kinetic energy?

Accepted Answer

$$3.75 \ \mathrm{J}$$

Question 19

A $$2 \ \mathrm{kg}$$ mass is attached to a spring with spring constant $$k = 50 \ \mathrm{N/m}. $$What is the period of oscillation?

Accepted Answer

$$1.26 \ \mathrm{s}$$

Phys 123X: College Physics I Syllabus – Course Structure and Topics Overview

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