Review Quiz

What simple machine can be used to split things apart and also it can hold open a door?

• Lever
• Pulley
• Wedge
• Screw

A _____ is a fixed bar that is free to move around a fixed point known as a fulcrum.

• pulley
• inclined plane
• lever

Work is done when .....

• a force is exerted on an object.

• an object exerts force onto another object.

• a force is exerted on an object causing the object to move.

• an object does not move.

A boy uses this simple machine to lift a load. How does this machine help the boy to do work?

• by changing the direction

• by reducing total work

• by decreasing distance

• by reducing effort force

Which ramp will require the least amount of force?

• A

• B

• C

• D

A lever used to lift a heavy box has an input arm of 4 meters and an output arm of 0.8 meters. What is the mechanical advantage of the lever?

• 1

• 2.5

• 5

• 10

This 2000 N weight is raised 1 meter by pulling 4 meters of rope. What force was required to pull the rope?

• 500 N
• 1000 N
• 2000 N
• 8000 N

Jeff is a landscaping contractor and lifts a rock weighing 600 Newtons by wedging a board under the rock. Jeff weighs 150 Newtons and puts all of his weight on the lever. How much mechanical advantage did the lever provide to Jeff in lifting the rock?

• 0

• 2

• 4

• 0.25

If two gear wheels are mounted on a common shaft then it's a ________ Gear Train.

• Common

• Compound

• Complying

• Shafting

True or False: Two meshed gears always rotate in opposite directions

• True

• False