Work And Simple Machines Review Question Preview (ID: 39106)


Unit 3 Review - Work, Power And Simple Machines. TEACHERS: click here for quick copy question ID numbers.

If you exert a force of 20 N to push a box 30 m in 25 s, how much work did you do?
a) 600 J
b) 1.5 J
c) 500 J
d) 0.67 J

In order to do work on an object, the force you exert must be
a) the maximum amount of force you are able to exert
b) in the same direction as the object's motion
c) in the direction opposite to Earth's gravitational force
d) quick

Simple machines can do all of the following except
a) decrease the amount of force you exert
b) increase the amount of work you do
c) increase the distance over which you exert a force
d) change direction

Pulleys function as simple machines
a) to reduce the amount of input force needed
b) to decrease the height that the object will be raised
c) to increase the distance over which the input force is applied
d) to change the direction of the input force

Which of these is an example of work being done on an object?
a) A crane holding a heavy piece of metal at a construction site.
b) Pushing a car that doesn't move in the snow.
c) Pushing a child on a swing.
d) A heavy iron doorstop holding a door closed on a windy day.

Why is easier to use a lever to move a large rock?
a) The action of the fulcrum decreases the amount of work to be done.
b) A lever and fulcrum don't make the work any easier.
c) The lever and fulcrum decrease the amount of force needed to move the rock.
d) Using the lever allows the wind to help in moving the rock.

In which scenario is the most work performed?
a) A boy carries a 5 N package 50 m across the street to her neighbor.
b) A lady pushes her golf cart with a force of 250 N but it doesn't move.
c) A man pulls a wagon with 1 N of force for 50 m.
d) The same amount of work is being done in all scenarios.

Ms. Gibby uses a crowbar to remove a large nail embedded in her deck. She pushes the bar down .5 m with a force of 25 N. The nail moves vertically upward 10 cm. What is the MA of the bar? (pay attention to your units!)
a) 0.1
b) 1
c) 2.5
d) 5

How much work do you do if you exert a force of 50 N over 2 m?
a) 25 J
b) 100 W
c) 25 W
d) 100 J

If it takes 500 J of work to move an object 25 m, how much force was exerted?
a) 20 N
b) 20J
c) 12,500 N
d) 12,500 J

Play Games with the Questions above at ReviewGameZone.com
To play games using the questions from above, visit ReviewGameZone.com and enter game ID number: 39106 in the upper right hand corner or click here.

TEACHERS / EDUCATORS
Log In | Sign Up / Register

Help / Support / FAQ




Gaming Links