Work and Mechanical Advantage

What is the work equation?
W= 

• F * d * cos(θ)
• m * a
• d / V
• F/ d * cos(θ)

A 5000N block is lifted 10 m. All force is going in the direction of movement. How much work was done?

• 50000 J
• 5000 J
• 500 J
• 50 J

If 150 Joules of work is needed to move a box 10 meters, what force was used? Neglect friction.

• 1500 N
• 15 N
• 1.5 N
• 150 N

Mechanical advantage is a measure of how much a machine multiplies the input

• efficiency.
• force.
• power.
• work.

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?

• 1:1

• 10:1

• 100:1

• 1:10

• 1:100

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

How much work is produced when 350N is used to move a car 5m?

• 70 J
• 1750 J
• 355 J
• 175 J

What is effort (input) force?

• the force one exerts on a 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 equation for mechanical advantage?

• MA=input force*output force
• MA=output force/input force
• MA=input force/output force
• MA= output force - input force

What is the mechanical advantage if you lift a load of 300 newtons and you only push down with 50 newtons?

• 250
• 50
• 60
• 6