# Work, Power And Machines Trivia Quiz!

20 Questions | Total Attempts: 138  Settings  .

• 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.

• 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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