Physics Spring Final Study Guide - …thecubscientist.com/Physics/Objectives/SpringFinalReview.pdfPhysics Spring Final Review Guide Physics Spring Final Study Guide 1. The gravitational

Physics Spring Final Review Guide

Physics Spring Final Study Guide

1. The gravitational potential energy that is possessed by an object is

dependent on the object’s:

a. acceleration

b. momentum

c. position

d. speed

e. elastic potential energy

2. As a ball falls freely toward the ground, the sum of its kinetic and

gravitational potential energy:

a. decreases

b. increases

c. remains the same

3. A spring with a spring constant of 4.0 N/m is compressed by a force of

1.2 N. What is the elastic potential energy stored in this compressed

spring?

a. 0.18 J

b. 0.36 J

c. 0.60 J

d. 4.8 J

e. 5.9J

4. The work done in lifting a 1 kg apple one meter near the Earth’s surface

is approximately:

a. 0.01 J

b. 1 J

c. 10 J

d. 100 J

e. 1000 J


5. A railroad car of mass m is moving with speed v when it collides with

and connects to a second railroad car of mass 3m, initially at rest, as

shown below. How do the speed and kinetic energy of the connected

cars compare to those of the single car of mass m before the collision?

Speed Kinetic Energy

a. Less Less

b. Less The same

c. The same Less

d. The same The same

e. Greater The same

6. Which of the following is true of the conservation of momentum and

kinetic energy?

a. Momentum is conserved only in inelastic collisions

b. Momentum is conserved only in elastic collisions

c. Kinetic energy is conserved only in inelastic collisions

d. Kinetic energy is conserved only in elastic collisions

e. Both require the same conditions in order to be conserved


7. A block of mass 3 kg slides along a horizontal surface that has negligible

friction except for one section, as shown below. The block arrives at the

rough section with a speed of 5 m/s and leaves it 0.5 s later with a speed

of 3 m/s. What is the magnitude of the work done by the frictional force

exerted on the block by the rough section of the surface?

a. 24 J

b. 16 J

c. 8 J

d. 6 J

e. 3 J

8. In problem #7 above, what is the magnitude of the frictional force

exerted on the block by the rough section of the surface?

a. 30 N

b. 12 N

c. 4.5 N

d. 4 N

e. 3 N


9. A block released from rest at position A slides with negligible friction

down an inclined track, around a vertical loop, and then along a

horizontal portion of the track as shown below. The block never leaves

the track. After the block is released, in which of the following

sequences of positions is the speed of the block ordered from fastest to

slowest?

a. B C D E

b. B E C D

c. D C E B

d. E B C D

e. E D C B

10. Refer to the situation in problem #9 above. Which of the following is

true of the net force on the block when it is at position C?

a. It is directed vertically downward

b. It is directed vertically upward only

c. It is directed to the left only

d. It is directed to the right only

e. It has components both to the left and vertically downward


11. A person throws a marble straight up into the air, releasing it a short

height above the ground and catching it at that same height. If air

resistance is negligible, which of the following graphs of position y

versus time t is correct for the motion of the marble as it goes up and

then comes down?


Sample Free Response Questions (FRQs)

Sample FRQ 1: Momentum and Kinematics Model (2D)


Sample FRQ 2: Momentum and Energy


Sample FRQ 3: Kinematics and Momentum


Sample FRQ 4: Energy and Momentum


Sample FRQ 5: Momentum / Kinematics


Study Guide Key

1. C Definition of Gravitational Potential Energy

2. C Conservation of Energy

3. A Spring potential energy

4. C Gravitational potential energy

5. A Conservation of Momentum / Definition of Kinetic Energy

6. D Conservation of Momentum & Elastic vs. Inelastic Collisions

7. A W = change in kinetic energy

8. B W=Fd, use kinematics to find d

9. B Conservation of Energy

10. E Centripetal Force

11. B Kinematics

FRQ 1 Solution

a. Impulse = 12 Ns

b. vhorizontal = 2.4 m/s

ci. vafter = 2 m/s

cii. To the right

d. Change in K = Kfinal – Kinitial = 154 J

e. Distance between two objects = 0.2 m (xblock = 1.2 m, xcube = 1m)

FRQ 2 Solution

a. PEspring = 50 J

b. vc = 4.58 m/s

c. vfinal = 3.05 m/s

d. d = 1.16 m

FRQ 3 Solution

a. ttotal = 3.6 s

bi. vAfinal = 1.2 m/s

bii. To the right

c. The collision is NOT elastic (Kinitial = 3125 J, Kfinal = 2484 J; loss of

kinetic energy)


FRQ 4 Solution

a. Mgh =1

2M 3.5v0( )

2, therefore, h =

3.52

2

v02

g

b. v = 0.5 v0

c. μ =2v0

2

Dg

d. The collision is inelastic; there is a loss of kinetic energy ( K = 3Mv02)

FRQ 5 Solution

a. v2after = 0.5 m/s, to the right

b. m = 3.1 kg

c. a = -0.73 m/s2

d. dtotal = 5.5 m

e. h = 0.12 m

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Physics Spring Final Study Guide - …thecubscientist.com/Physics/Objectives/SpringFinalReview.pdfPhysics Spring Final Review Guide Physics Spring Final Study Guide 1. The gravitational