Q: A $$1\ \mathrm{kg}$$ object is acted on by two forces: $$10\ \mathrm{N} to $$the right and $$4\ \mathrm{N} to $$the left. What is the acceleration?

$$6\ \mathrm{m/s^2$}$$\ \text{to the right}

Question 1

A car accelerates uniformly from rest to a velocity of $$20\ \mathrm{m/s} in$$ $$10\ \mathrm{s}. $$What is the magnitude of its acceleration?

Accepted Answer

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

Question 2

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

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 3

A $$5\ \mathrm{kg}$$ box is pushed with a force of $$25\ \mathrm{N} on a $$frictionless surface. What is its acceleration?

Accepted Answer

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

Question 4

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

Accepted Answer

$$11.5\ \mathrm{m}$$

Question 5

Which of the following is a scalar quantity?

Accepted Answer

Temperature

Question 6

A $$2\ \mathrm{kg}$$ 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

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

Question 7

Which law explains why passengers lurch forward in a car when it suddenly stops?

Accepted Answer

Newton's First Law

Question 8

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 9

Which of the following statements about energy is correct?

Accepted Answer

Energy can be transformed from one form to another but cannot be created or destroyed.

Question 10

A $$10\ \mathrm{kg}$$ block slides down a frictionless incline $$5\ \mathrm{m}$$ high. What is its speed at the bottom? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

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

Question 11

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

Accepted Answer

Mass is the amount of matter in an object; weight is the force of gravity acting on that mass.

Question 12

A $$3\ \mathrm{kg}$$ object moving at $$6\ \mathrm{m/s}$$ has what kinetic energy?

Accepted Answer

$$54\ \mathrm{J}$$

Question 13

A $$0.2\ \mathrm{kg}$$ apple falls from a tree $$2\ \mathrm{m}$$ above the ground. What is its potential energy relative to the ground? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$3.92\ \mathrm{J}$$

Question 14

Which of the following is NOT a vector quantity?

Accepted Answer

Speed

Question 15

A $$1\ \mathrm{kg}$$ object is acted on by two forces: $$10\ \mathrm{N} to $$the right and $$4\ \mathrm{N} to $$the left. What is the acceleration?

Accepted Answer

$$6\ \mathrm{m/s^2$}$$\ 	ext{to the right}

Question 16

A person pushes a $$50\ \mathrm{kg}$$ cart with a force of $$100\ \mathrm{N}$$ over a distance of $$10\ \mathrm{m}. $$How much work is done?

Accepted Answer

$$1000\ \mathrm{J}$$

Question 17

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

Accepted Answer

A swimmer pushes water backward and moves forward.

Question 18

A $$0.1\ \mathrm{kg}$$ bullet is fired at $$500\ \mathrm{m/s}$$ into a $$2\ \mathrm{kg}$$ block at rest. What is the final velocity of the bullet-block system if they stick together?

Accepted Answer

$$23.8\ \mathrm{m/s}$$

Question 19

Which of the following best describes the concept of inertia?

Accepted Answer

The tendency of an object to resist changes in its state of motion.

Question 20

A $$60\ \mathrm{kg}$$ astronaut floats in space and pushes off a $$120\ \mathrm{kg}$$ satellite with a force of $$30\ \mathrm{N}. $$What is the astronaut's acceleration?

Accepted Answer

$$0.5\ \mathrm{m/s^2$}$$

Syllabus and Course Structure: Introduction to Basic Physics (PHY 145)

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드