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- 1. Multiple Choice
Which of the following is defined as an energy transfer?
kinetic energy
work
potential energy
chemical energy
- 2. Multiple Choice
The unit of work is
watt
hertz
joule
pascal
- 3. 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
- 4. 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
- 5. Multiple Choice
Four students run up the stairs in the time shown. Which student has the largest power output?
A
B
C
D
- 6. 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
- 7. 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
- 8. Multiple Choice
What is the unit for power?
what
watt
joule
Jewel-Osco
- 9. Multiple Choice
Which requires more work – a person walking up stairs or a person running up stairs?
walking
running
they require equal work
no work is required for either because the movement is vertical
- 10. Multiple Choice
Which requires more power – a person walking up stairs or a person running up stairs?
walking
running
they require equal power output
no power is required at all
- 11. Multiple Choice
How much work is done on a 200-kg crate that is hoisted 2 m in a time of 4 s?
400 J
1000 J
1600 J
4000 J
- 12. Multiple Choice
How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s?
400 W
1000 W
1600 W
4000 W
- 13. Multiple Choice
An 8-kg object is raised by a crane to the top of a building 20-meters in height. If it takes 50 seconds for the object to get to the top of the building, then how much power was needed?
1600 watts
3.2 watts
32 watts
200 watts
- 14. Multiple ChoiceKinetic Energy is defined asEnergy stored due to its locationEnergy of motionEnergy stored in the bonds of moleculesHeat energy
- 15. Multiple ChoiceWhich of the following objects has the most kinetic energy?A 20 kg toddler running at 5 m/sA 50 kg toddler running at 30 m/sA 90 kg toddler running at 30 m/sA 100 kg toddler running at 2 m/s
- 16. Multiple ChoiceMr. B's and Mr. P's classes competed in a game of tug of war. Mr. B's class pulled to the right with a force of 4,000 N. Mr. P's class pulled to the left with a force of 5,000 N. As a result the rope moved 5.1 m to the left. How much work was done by the net force?4100 J3100 J5100 J8100 J
- 17. Multiple Choice
When my velocity triples, my kinetic energy increases by
9 times
2 times
5 times
0.5 times
- 18. Multiple ChoiceIn which of the following situations do your arms do work on books?holding a heavy stack of books while standingcarrying a heavy stack of booksdropping a stack of books onto a tablepicking up a pile of books from the floor
- 19. Multiple ChoiceWhat is the difference between calculating power and work?Power takes into account the time it takes to complete a taskWork takes into account the time it takes to complete a taskPower is force/areaWork is force/area
- 20. Multiple ChoiceWhenever work is done, energy changesLaw of Conservation of EnergyWork-Energy TheoremNewton's Fourth LawEfficiency
- 21. Multiple Choice
Winnie and Eeyore have the same mass and have just finished climbing the same tree, but Eeyore was 4 seconds faster then Winnie. Who used the most power?
Winnie as he took the longer time and did the same amount of work as Eeyore
Winnie as he is shorter and could grip more as so did more work overall
Eeyore as he did the same amount of work as Winnie but in a shorter time.
Eeyore as he did more work than Winnie but in a shorter time
- 22. Multiple Choice
On a force versus change in position graph, the area under the curve is a representation of:
force
position
KE
PE
Work
- 23. Multiple Choice
If the mass of the cart is 8.12kg, what is the kinetic energy of the cart?
0J
1.2J
6J
58.8J
- 24. Multiple Choice
Work is done only if
a force is applied.
the force applied causes the object's motion.
an object is in motion.
- 25. Multiple Choice
The equation for POWER is
power = mass x time
power = work / time
power = time / work
power = work x time
- 26. Multiple Choice
The equation for work is
work = power x mass
work = power / time
work = force x distance
work = distance x time
- 27. Multiple Choice
The equation for KINETIC ENERGY is
KE = mass x gravity
KE = 1/2 height x speed
KE = mass2
KE = 1/2 mass x speed2
- 28. Multiple Choice
Renatta Gass is out with her friends. Misfortune occurs and Renatta and her friends find themselves getting a workout. They apply a cumulative force of 1080 N to push the car 218 m to the nearest fuel station. Determine the work done on the car.
2.35 x 105 J
2.05 x 105 J
1.35 x 105 J
3.25 x 105 J
- 29. Multiple Choice
We would use _______ for a _______ graph to calculate power.
area under the curve / F vs d
area under the curve / W vs t
slope / W vs t
slope / F vs d
- 30. Multiple ChoiceA student weighing 700 N climbs at a constant speed to the top of an 8m verticle rope in 10 s. The average power expended by the student to overcome gravity is most nearly1.1 W87.5 W560W875 W
- 31. Multiple ChoiceIt takes work to lift a rock. How much work does it take to lift a rock 3 times higher?three times as muchtwo times as muchfour times as muchten times as much
- 32. Multiple ChoiceIf a person does the same amount of work as someone else in half the time, which of the following is true?they did twice the workthey did half the workthey have twice the powerthey have half the amount of power
- 33. Multiple ChoiceIf 150 Joules of work is needed to move a box 10 meters, what force was used?1500 N15 N1.5 N150 N
- 34. Multiple Choice
During the Powerhouse lab, Jerome runs up the stairs, elevating his 102 kg body a vertical distance of 2.29 meters in a time of 1.32 seconds at a constant speed. Determine the power generated by Jerome.
1.73 x 103 W
1.48 x 103 W
1.91 x 103 W
1.27 x 103 W
- 35. Multiple Choice
A new conveyor system at the local packaging plan will utilize a motor-powered mechanical arm to exert an average force of 890 N to push large crates a distance of 12 meters in 22 seconds. Determine the power output required of such a motor.
490 Watts
40. Watts
11 x 103 Watts
0.55 Watts
- Answer choicesTagsAnswer choicesTags