Question 1

A car starts from rest and accelerates uniformly along a straight road. After 8 seconds, it has traveled 128 meters. What is the magnitude of its acceleration?

Accepted Answer

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

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 kg object is moving in a circle of radius 2 m at a constant speed of 3 m/s. What is the magnitude of the net force acting on the object?

Accepted Answer

$$F = 22.5\ \mathrm{N}$$

Question 4

A ball is thrown vertically upward with an initial velocity of $$20\ \mathrm{m/s}. $$Neglecting air resistance, what is the maximum height it reaches? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$h = 20.4\ \mathrm{m}$$

Question 5

Which of the following is a correct statement of the work-energy theorem?

Accepted Answer

The net work done on an object is equal to its change in kinetic energy.

Question 6

A 2 kg block slides down a frictionless incline of height 5 m. What is its speed at the bottom of the incline?

Accepted Answer

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

Question 7

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 maximum height reached by the projectile? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$h_{max} = 20.4\ \mathrm{m}$$

Question 8

Which of the following best describes the concept of equilibrium in physics?

Accepted Answer

The net force and net torque on an object are both zero.

Question 9

A 3 kg object is attached to a string and swung in a horizontal circle of radius 1.5 m at a speed of 6 m/s. What is the tension in the string?

Accepted Answer

$$T = 72\ \mathrm{N}$$

Question 10

A 10 kg box is pulled across a horizontal surface with a constant velocity by a force of 30 N. What is the coefficient of kinetic friction between the box and the surface? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$\mu_k = 0.31$$

Question 11

A cyclist increases her speed from $$5\ \mathrm{m/s} to$$ $$15\ \mathrm{m/s} in$$ $$10\ \mathrm{s}. $$What is her average acceleration?

Accepted Answer

$$a = 1.0\ \mathrm{m/s^2$}$$

Question 12

A 0.2 kg ball is dropped from a height of 10 m. What is its velocity just before it hits the ground? (Neglect air resistance, $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

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

Question 13

Which of the following statements about free-fall motion is correct?

Accepted Answer

All objects in free fall near Earth's surface experience the same acceleration, regardless of mass.

Question 14

A 4 kg mass is attached to a spring and oscillates horizontally with a period of 2 seconds. What is the spring constant $$k$$?

Accepted Answer

$$k = 39.5\ \mathrm{N/m}$$

Question 15

A 1.5 kg object is moving at $$10\ \mathrm{m/s}. $$What is its kinetic energy?

Accepted Answer

$$KE = 75\ \mathrm{J}$$

Question 16

A 2 kg object is moving in a circle of radius 0.5 m at a speed of 4 m/s. What is the centripetal acceleration?

Accepted Answer

$$a_c = 32\ \mathrm{m/s^2$}$$

Question 17

A block of mass 3 kg is at rest on a frictionless surface. A force of 12 N is applied to it for 4 seconds. What is its final velocity?

Accepted Answer

$$v = 16\ \mathrm{m/s}$$

Question 18

A 0.5 kg ball is thrown horizontally from a 20 m high cliff. How long does it take to hit the ground? (Neglect air resistance, $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$t = 2.02\ \mathrm{s}$$

Question 19

A 10 kg mass is suspended from a rope. What is the tension in the rope if the mass is at rest? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$T = 98\ \mathrm{N}$$

Physics 141: Syllabus and Course Structure Overview

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드