Simple Machines and Mechanical Advantage

How does a single fixed puled, like the one seen here, 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

The amount by which a machine multiplies input force is known as the 

• work.
• power.
• output force.
• mechanical advantage.

What is the primary mechanical advantage of using the simple machine seen in the image?

• You can apply a large force and have it penetrate over a very long distance.
• You can apply a long distance and have it convert into a very short distance.
• You can apply a short distance and have it multiplied to penetrate a large distance.
• You can apply a small force to penetrate something that normally requires a large force.

Jeff is a landscaping contractor and lifts a rock weighing 600 pounds by wedging a board under the rock. Jeff weighs 150 pounds 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
• 8

What is the mechanical advantage of the block and tackle used to lift the bale of cotton?

• 1
• 2
• 3
• 4

What is the primary mechanical advantage of using the simple machine seen in the image?

• You can apply a small input force and have it multiplied into a large output force.
• You can apply a large input force and have it multiplied into a small output force.
• You can apply a small input distance and have it multiplied into a large output distance.
• You can apply a large input distance and have it multiplied into a small output distance.

This pulley

• has a mechanical advantage of 1 and does not make work easier.
• has mechanical advantage of 2 and reduces the force needed to lift an object.
• has a mechanical advantage of 2 and changes the direction of the applied force.
• has a mechanical advantage of 1 and changes the direction of the force needed to lift an object.

A knife is an example of a (an)

• inclined plane
• wedge
• ramp
• pulley

All of these are examples of a wheel and axle except:

• pizza cutter
• doorknob
• windmill
• lever

A simple machine usually used to raise a flag is a (an)

• inclined plane

• pulley

• lever

• wheel and axle