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- 1. Multiple Choice
What is the kinetic energy of a soccer ball with a mass of 0.8 kg that has a velocity of 10 m/s?
40 J
4 J
8 J
80 J
- 2. Multiple Choice
There is a clock at the top of a tower that is 45 m high. The clock has a mass of 20 kg. Calculate the clock's gravitational potential energy.
8100 J
9000 J
900 J
8820 J
- 3. Multiple Choice
A polar bear has an average mass of 500 kg. If its maximum kinetic energy is 60,500 J, what is its top speed?
121 m/s
15.56 m/s
242 m/s
15,125 m/s
- 4. Multiple Choice
An airplane designed to carry a space shuttle has a top speed of 236 m/s and at that speed its kinetic energy is 9,760,000,000 J. What is its mass?
350,474 kg
87618.5 kg
175,237 kg
41,355,932 kg
- 5. Multiple ChoiceAs a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy?Both the potential energy and kinetic energy decreaseThe potential energy decreases while the kinetic energy increasesThe kinetic energy decreases while the potential energy increasesBothe the potential energy and kinetic energy increase
- 6. Multiple Choice
The kinetic and potential energies of an object both always depend on which property?
mass of the object
volume of the object
relative position of the object
gravitational force on the object
- 7. Multiple Choice
Which of the following is true about a ball that is thrown straight up in the air and then caught on its return to the ground?
Its total mechanical energy varies throughout its flight.
Its initial kinetic energy is greater than its final kinetic energy.
Its initial potential energy is less than its final potential energy.
Its total mechanical energy is constant throughout its flight.
- 8. Multiple Choice
20 J, because the energy in the system cannot change form but can be created and destroyed
80 J, because the energy in the system can change form but cannot be created or destroyed
30 J, because the potential energy is the only energy at the bottom of the ramp
50 J, because the kinetic energy is the only energy at the bottom of the ramp
- 9. Multiple Choice
An arrow that is pulled back by a bow has which type of energy?
gravitational potential energy
kinetic energy
chemical potential energy
elastic potential energy
- 10. Multiple Choice
People get energy from the food that they eat and transform that energy as they move. Which energy transformations occur as a student rapidly rubs the palms of his hands together?
mechanical to electrical
mechanical to thermal
chemical to sound
- 11. Multiple Choice
Which object shows an energy transformation from electrical to mechanical?
- 12. Multiple Choice
A light plastic cart and a heavy steel cart are both pushed with the same force for a distance of 1.0 m, starting from rest. After the force is removed, the kinetic energy of the light plastic cart is ________ that of the heavy steel cart.
greater than
equal to
less than
can't say unless we know how big the force is
- 13. Multiple Choice
Each of the boxes shown is pulled for 10 m across a level, frictionless floor by the force given. Which box experiences the greatest change in its kinetic energy?
A
B
C
D
E
- 14. Multiple Choice
Rank in order, from largest to smallest, the gravitational potential energies of the balls.
1 > 2 = 4 > 3
1 > 2 > 3 > 4
3 > 2 = 4 > 1
3 > 2 > 4 > 1
- 15. Multiple Choice
Starting from rest, a marble first rolls down a steeper hill, then down a less steep hill of the same height. Ignoring friction, for which is it going faster at the bottom?
Faster at the bottom of the steeper hill
Faster at the bottom of the less steep hill
Same speed at the bottom of both hills
Can’t say without knowing the mass of the marble
- 16. Multiple Choice
A small child slides down the four frictionless slides A–D. Rank in order, from largest to smallest, her speeds at the bottom.
vD > vA > vB > vC
vD > vA = vB > vC
vC > vA > vB > vD
vA = vB = vC = vD
- 17. Multiple Choice
A major league pitcher can throw a baseball with a kinetic energy of 150 J. How much work must the pitcher do to the ball to give it that much KE?
150 J
0
Can’t tell without knowing the mass of the ball
- 18. Multiple Choice
A rock has 10 J of potential energy on top of a roof. If it is dropped and lands with only 8 joules of kinetic energy, how much work did air resistance do on the rock?
-18 J
-10 J
-8 J
-2 J
- 19. Multiple Choice
A basketball that is dropped bounces back up to its original height. Pick the correct energy transformation from the point when it was dropped until it returns to the original height.
KE --> PE --> Elastic
PE --> KE --> Elastic --> KE --> PE
KE --> PE --> Elastic --> PE --> KE
Elastic --> PE --> KE --> Elastic
- 20. Multiple Choice
A cat is chasing a mouse down a hill. Select all that apply
The cat has potential and kinetic energy.
The mouse has potential and kinetic energy
Neither has potential energy
If they run at the same speed the cat has more potential energy than the mouse
- 21. Multiple ChoiceA force of F=500 N is applied to extend a spring. What is the displacement x of the spring if its spring constant is k= 540 N/m?0.96 m0.93 M1.3 m1.1 m
- 22. Multiple ChoiceA net force of 430 N acts to stretch an extension spring. How far will the spring stretch if its spring constant is 700 N/m?43.90.307 m1.63 m0.614 m
- 23. Multiple ChoiceA cylinder hangs motionless 40 cm below its equilibrium position from a spring with a constant of 50 N/m. What is the mass of the cylinder?.8 kg1.25 kg2 kg6 kg
- 24. Multiple Choice
Sam, the butcher, puts 3 kg of chopped beef on the 1 kg pan and places on top of his scale. The scale has a spring constant of 400 N/m.
What would happen to the force on the scale if Mrs. Wantsmore tells Sam to put more chopped beef on the scale? What type of relationship would this be between mass and force?
Increase mass = increase force, Direct
Increase mass = decrease force, Direct
Increase mass = increase force, Inverse
Nothing because mass has nothing to do with pendulums or springs.
- 25. Multiple ChoiceWhat force should be applied to compress a spring by 0.013 m if its spring constant is k = 1900 N/m?1880 N24.7 N1900 N0.127 N
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