Work, Power And Machines Trivia Quiz!
20 Questions
| Total Attempts: 138
.
Questions and Answers
- 1.A leaf rake makes work easier by increasing the output force.
- A.
True
- B.
False
- 2.You push on an object for 5 seconds. During those 5 seconds, the object moves 0.87 m. After you stop pushing, the object moves another 0.30 m. The distance you should use to calculate work is ____________.
- 3.Kinetic and potential energy increase when you lift something in the air.
- A.
True
- B.
False
- 4.The formula to calculate power is work times distance.
- A.
True
- B.
False
- 5.Work can occur without motion.
- A.
True
- B.
False
- 6.A machine converts input work into output work.
- A.
True
- B.
False
- 7.One way a machine can make work easier is to change the direction of the force.
- A.
True
- B.
False
- 8.A machine that has an output force that is equal to the input force has a mechanical advantage of less than one.
- A.
True
- B.
False
- 9.What does a machine do to the amount of work that needs to be done?
- A.
Decreases it
- B.
Increases it
- C.
Keeps it the same
- D.
Eliminates it
- 10.According to scientists, which of the following are considered work?
- A.
Reading
- B.
Studying
- C.
Lifting weights
- D.
Moving a bookshelf
- 11.Work is done to lift an object off of the ground.
- A.
True
- B.
False
- 12.The efficiency of a machine is also a measure of
- A.
Friction
- B.
Accuracy
- C.
Work
- D.
Energy
- 13.Only the part of a force that acts in the direction of motion does work.
- A.
True
- B.
False
- 14.Moving something faster changes the amount of work done on the object in comparison to moving it in the same distance at a slower speed.
- A.
True
- B.
False
- 15.The work done to lift an object off the ground is equal to the mass of the object multiplied by the distance it is lifted.
- A.
True
- B.
False
- 16.Calculate the power used to move an object 3.0 m using 2 N of force over 2.5 seconds. (Hint: find work, then power) Work = Force x distance Power = Work/time
- A.
6 W
- B.
5 W
- C.
15 W
- D.
2.4 W
- 17.Pamela uses a nutcracker to break an walnut. She applies a force of 24 N on the nutcracker. The force exerted on the almond is 60 N. Calculate the mechanical advantage of the nutcracker.MA = output force/input force
- A.
2.5
- B.
0.4
- C.
1,440
- D.
6
- 18.You push on an object for 4 seconds with a force of 3 N. During those 4 seconds, the object moves 0.85 m. After you stop pushing, the object moves another 0.10 m. Calculate the work done on the object. Work = Force x distance
- A.
3.4 J
- B.
2.55 J
- C.
2.85 J
- D.
3.8 J
- 19.Ross does 30 J of work with a lever. The output work of the elver is 25 J. Calculate the efficiency of the lever.Efficiency = output work/input work x 100
- A.
12%
- B.
8.3%
- C.
83%
- D.
120%
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