Mechanical Advantage

What is resistance (output) force?

• the force required by a machine in order to accomplish work (the force you put on the machine)
• the force which an effort force must overcome in order to do work on an object via a simple machine.
• the force the machine exerts on a object
• the output work times the input distance

What is the mechanical advantage of this pulley system?

• 2
• 3
• 4
• 5

Tags

NGSS.MS-ETS1-2

Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever?

• 1
• 10
• 100
• 1000

Tags

NGSS.MS-PS2-2

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

A machine is a device that____________.

• changes either the magnitude or direction of force
• always makes lifting objects require more effort
• changes only magnitude of the force
• Changes only direction of the force

Tags

NGSS.MS-ETS1-1

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

A lever and fulcrum are used to lift a fallen tree, which has a weight of 480 N. If the lever has a mechanical advantage of 5.5, what is the input force that will begin lifting the tree off the ground?

• 5.5 N
• 40.7 N
• 87.3 N
• 2640 N

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

When given input and output forces, you find mechanical advantage by:

• Output divided by input
• Input divided by output
• Output multiplied by input

An axle is 4 meters and the wheel is 8 meters.  What is the mechanical advantage?

• 2
• 32
• .5