Mechanical Advantage and Efficiency

Open Ended

What kind of work do you do?

Multiple Choice

You do work when you mannequin pose with an object in your hand.

• True

• False

Multiple Select

Two factors that determine work are...

• Force

• Mass

• Velocity

• Distance

Multiple Choice

Units of force are...

• Newtons

• Grams

• Joules

• Meters

Multiple Choice

Units of work are...

• Newtons

• Grams

• Joules

• Meters

Multiple Choice

What is the formula for work?

• Force = work × distance

• Distance = force × work

• Work = force × distance

• Work = force × mass

Multiple Choice

If 40N of force is applied to Rollo Koster's 10 kg cart over a distance of 50 meters, how much work is done?

• 8000 J

• 8000 N

• 4000 J

• 2000 J

Multiple Choice

A simple machine that consists a rigid bar that pivot about a fixed point

• lever
• pulley
• wheel and axle
• fulcrum 

Multiple Choice

An inclined plane wrapped around a rod forms this simple machine 

• lever
• pulley
• screw
• wedge 

Multiple Choice

A flat sloping surface that connects lower and higher elevations. It makes raising objects easier.  

• wedge
• screw
• lever
• inclined plane 

Multiple Choice

An axe is an example of a

• pulley
• inclined plane
• screw
• wedge 

Multiple Choice

A seesaw is an example of a  

• wedge
• lever 
• inclined plane 
• pulley 

Multiple Choice

A device that has two or more simple machines working together 

• fulcrum 
• pulley
• compound (complex) machine 
• motor 

Multiple Choice

What is a Ratio?

• It's a comparison of two things
• Multiplying two fractions 
• A number over another number
• Two decimals that can be multiplied

Multiple Choice

The _____ of a machine compares the output work to the input work and expressed as a percent.

• mechanical advantage

• efficiency

• output force

• effectiveness

Multiple Choice

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

Multiple Choice

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

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

Multiple Choice

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