Question 1

A car accelerates from rest along a straight road. If its acceleration is constant at $$2\ \mathrm{m/s^2$}$$, what is the car's velocity after $$5\ \mathrm{s}$$?

Accepted Answer

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

Question 2

A projectile is launched at an angle of $$30^\circ$$ above the horizontal with an initial speed of $$20\ \mathrm{m/s}. $$What is the maximum height it reaches? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$10.2\ \mathrm{m}$$

Question 3

A $$5\ \mathrm{kg}$$ box is pulled across a horizontal surface with a force of $$20\ \mathrm{N}$$, and the coefficient of kinetic friction is $$0.2. $$What is the acceleration of the box?

Accepted Answer

$$1.2\ \mathrm{m/s^2$}$$

Question 4

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

Accepted Answer

The net force on an object is equal to the mass times its acceleration: $$F_{	ext{net}} = m a$$

Question 5

A $$2\ \mathrm{kg}$$ object is moving at $$3\ \mathrm{m/s}$$ and collides with a stationary $$1\ \mathrm{kg}$$ object. If the collision is perfectly elastic, what is the velocity of the $$1\ \mathrm{kg}$$ object after the collision?

Accepted Answer

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

Question 6

A student pushes a $$10\ \mathrm{kg}$$ box up a $$30^\circ$$ incline with a force parallel to the incline. If the box moves at constant speed and the coefficient of friction is $$0.1$$, what is the magnitude of the force required?

Accepted Answer

$$58\ \mathrm{N}$$

Question 7

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

Accepted Answer

$$8\ \mathrm{N}$$

Question 8

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

Accepted Answer

$$W = F d \cos 	heta$$

Question 9

A $$1\ \mathrm{kg}$$ object is dropped from a height of $$5\ \mathrm{m}. $$What is its velocity just before hitting the ground? (Ignore air resistance, $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

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

Question 10

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 11

A satellite orbits Earth at a distance where the gravitational force is $$F. If $$the satellite's distance from Earth's center is doubled, what is the new gravitational force?

Accepted Answer

$$F/4$$

Question 12

Which of the following is the correct expression for the torque $$	au$$ produced by a force $$F$$ applied at a distance $$r$$ from the axis, at an angle $$	heta$$?

Accepted Answer

$$	au = r F \sin 	heta$$

Question 13

A spinning disk has a moment of inertia $$I$$ and angular velocity $$\omega. $$What is its rotational kinetic energy?

Accepted Answer

$$\frac{1}{2} I \$$omega^2$$

Question 14

A $$0.2\ \mathrm{kg}$$ ball is attached to a string and swung in a vertical circle of radius $$0.5\ \mathrm{m}. $$What is the minimum speed at the top of the circle to keep the string taut? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$2.2\ \mathrm{m/s}$$

Question 15

Which of the following statements about friction is correct?

Accepted Answer

Kinetic friction acts when objects are moving relative to each other.

Question 16

A $$0.5\ \mathrm{kg}$$ object is moving in a circle of radius $$1\ \mathrm{m} at$$ $$2\ \mathrm{rad/s}. $$What is its angular momentum?

Accepted Answer

$$2\ \mathrm{kg\cdot m^2$/s}$$

Question 17

A planet has twice the mass of Earth and the same radius. What is the acceleration due to gravity on its surface?

Accepted Answer

$$19.6\ \mathrm{m/s^2$}$$

Question 18

A $$2\ \mathrm{kg}$$ object is attached to a $$0.5\ \mathrm{m}$$ radius wheel and rotates at $$3\ \mathrm{rad/s}. $$What is its rotational kinetic energy?

Accepted Answer

$$4.5\ \mathrm{J}$$

Question 19

A $$1\ \mathrm{kg}$$ object is moving at $$5\ \mathrm{m/s} in a $$straight line. What is its momentum?

Accepted Answer

$$5\ \mathrm{kg\cdot m/s}$$

PHY 221: Lecture and Lab Schedule Overview (Spring 2026)

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드