Name: __________________________ Period: _______________ Date: _______________
Review Sheet for
Physics Finals (Fall 2021)
A. Projectile Motion
Questions 1 & 2 refer to the situation and diagram below:
Sphere A is projected off the edge of a 1.0 m high bench with a
horizontal velocity of 2.0 m/s. Sphere B is dropped from the
same height as Sphere A. Both spheres have the same size and
mass.
1. Which ball will be in the air for the greater amount of time?
A. Ball A
B. Ball B.
C. They will be in the air for the same amount of time.
D. There is not enough information to decide.
2. Which ball will have the greater vertical speed at the point of impact?
A. Ball A
B. Ball B.
C. They will both have the same vertical speed at impact.
D. There is not enough information to decide.
3.
A soccer ball is kicked from the ground and lands on the ground 2.2 seconds later.
a. What is the initial vertical component of the ball's velocity?
b. How high does the ball get above the ground?
c. If the ball was kicked at an angle of 55 degrees above horizontal, what was the ball's total initial speed?
4. . An athlete throws the shotput with an initial velocity of 14 m/s at a 40° angle from the horizontal. The
shotput leaves his hand at a height of 2.2 m above the ground.
a. Determine the horizontal component of the initial velocity.
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Name: __________________________ Period: _______________ Date: _______________
b. Determine the vertical component of the initial velocity.
c. Determine how long the shotput is in the air. (Hint: the quadratic formula may be needed.)
d. Calculate the horizontal distance the shotput traveled.
B. Circular Motion
5. In each of the pairs of diagrams below, a sphere attached to a string is swung in a horizontal circle.
Examine each diagram carefully to note which variable has been changed. “T” stands for period.
a. Compare the speed of A and B. Show your work.
b. Compare the centripetal force on A and on B. Show your work.
c. Compare the centripetal acceleration of A and B. Show your work.
6. Which of the following is true for an object traveling in a circular path at constant speed?
A. its speed is constant, so its acceleration is zero.
B. its speed is constant, but its velocity is changing.
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Name: __________________________ Period: _______________ Date: _______________
C. both its speed and velocity are constant.
D. both its velocity and acceleration are constant.
7. What is the direction of the net force of an object traveling in a circular path at constant speed?
8. Noah Formula is in an airplane which is flying at constant speed in a circular course of radius 5000
meters, circling O'Hare Airport prior to landing. Noah observes that the plane completes each round trip in
400 seconds. (a) What is the speed of the airplane? (b) What is its centripetal acceleration?
9. Tommy, who has a mass of 30 kg, sits 4.0 meters from the center of a merry-go-round that is rotating
with a period of 10 seconds. What is the centripetal force acting on Tommy?
10. Find the gravitational force of attraction between the moon and the Earth if the mass of the moon is 1/81
times the mass of Earth. (Mass of Earth = 6 x1024 kg; radius of moon’s orbit is 3.58x105 km)
C. Energy
For questions 11-13, consider the diagram representing a portion of an amusement park ride. A 100. kg car
has a total of 30,000. J of gravitational energy at point A. It moves down a frictionless track and comes to a
stop as it compresses a spring at point D.
A
30
Height (m)
D
20
10
0
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B
C
Name: __________________________ Period: _______________ Date: _______________
11. On the axes below, quantitatively sketch the energy bar graphs when the car is at the indicated points.
Ek Eg
0
0
Position A
Eel
Ek Eg
Eel
Energy (J)
Eel
Energy (J)
Ek Eg
Energy (J)
Eel
Energy (J)
Ek Eg
0
Position B
0
Position C
Position D
12. How many Joules of kinetic energy does the car have at point C? Justify your answer.
13. How fast is the car moving at point B? Show work.
14. Hulky and Bulky challenge each other to a race up a flight of stairs (∆h = 4.0 m). Hulky, whose mass is 120
kg, makes the climb in 3.0 s; while Bulky, 150 kg, took 4.0 s to make the climb.
a. Who has more Eg at the top? Explain.
b. Who was more powerful?
15. In the final situation below, the 8.0 kg box has been launched with a speed of 10.0 m/s across a frictionless
surface.
a. Draw the bar graphs and energy flow diagram for the situation.
Energy (J)
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Eel
System/Flow
Ek Eg
Energy (J)
Ek Eg
0
0
Initial
Final
Eel
Eth
Name: __________________________ Period: _______________ Date: _______________
b. Find the energy stored in the spring.
d. In the initial situation, the spring was compressed 4.0 m. Find the spring constant.
D. Momentum and Impulse
16. How much momentum does a 1850 kg pick up truck have when is it is parked? Why? How much
momentum does it have when it is moving at 30 m/s?
17. A 2.0 kg egg drop package falls toward the ground with a speed of 10.0 m/s. When it hits the ground it
stops in 0.0070 s. What is the average force on the package while it is stopping?
18. A force of 800 N is used to stop an object with a mass of 50 kg moving with a velocity of 35 m/s. How long
will it take to stop this object?
19. A 1250 kg car is moving down the highway with a velocity of 32.0 m/s when it bumps into the car ahead of
it which has a mass of 875 kg and a velocity of 25.0 m/s. After the collision, the two cars stick together. What
will be the resulting velocity of the two cars together?
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Name: __________________________ Period: _______________ Date: _______________
20. An astronaut at rest in space with mass 84 kg fires a thruster that expels 35 g of hot gas at 875 m/s. What is
the velocity of the astronaut after firing the thruster?
E. Waves (see notes to review)
21. Label the parts of the wave.
22. A harp string supports a wave with a 2.3 m wavelength and a frequency of 220 Hz. What is the wave
speed?
23. What is the period of oscillation?
24. Differentiate reflection and refraction.
25. Describe the two kinds of interference: constructive and destructive.
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