Work, Power, Energy and Simple Machines Review

The board acts as a simple machine to help lift a heavy rock. The board would be classified as what type of simple machine?

• ramp
• lever
• pulley
• inclined plane

Tags

NGSS.MS-PS2-1

Which two simple machines are found in a pair of scissors?

• screw and lever
• lever and wedge
• screw and inclined plane
• wedge and inclined plane

Using a simple machine, the machine cannot decrease the amount of _____, but can increase the amount of _____.

• work, force
• force, work
• power, energy
• energy, power

Tags

NGSS.MS-PS3-5

How does a single fixed pulley, help you do work?

• changes the direction of the force
• increases the amount of applied force
• decreases the amount of applied force
• allows you to pull the rope a shorter distance

What is a device that makes work easier by changing the size or direction of the force?

• Power
• Watt
• Machine
• Force

What is the work done by a machine on an object?

• Power
• Work Output
• Work Input
• Lever

Tags

NGSS.MS-PS3-5

What is the work that you do on a machine?

• Work Output
• Work Input
• Lever
• Power

In which situation is a person doing work on an object?

• A school crossing guard raises a stop sign that weighs 10 N.
• A student walks while wearing a backpack that weighs 15 N.
• A man exerts 350 N of force on a rope attached to a house.
• A worker holds a box 1 m off the floor.

How does a ramp make lifting a heavy object easier?

• The object is moved over a shorter distance.
• The ramp increases the amount of work you do.
• Less force is needed to move the object over a longer distance.
• More force is needed to move the object over a longer distance.

Greg applies a force of 100 N to move a box 5 meters. How much work did he do?

• 100J
• 500J
• 5J
• 500N