Work Power and Simple Machines

If the Actual Mechanical Advantage (AMA) of a simple machine is 4, and the Ideal Mechanical Advantage (IMA) is 4.87, what is the Efficiency of the machine?

Hint: AMA/IMA x 100 = Efficiency

• 82.1%

• 12.17%

• 121%

• 88.7%

These two parts act as one simple machine. They roll and are found on cars, bikes and wheelbarrows.

• Wheel & Axle

• Pulley

• Inclined Plane

• Lever

Tags

NGSS.MS-PS2-1

This simple machine can be used to lift a weight. It has a fulcrum, or pivot point, which can be located in the center, near the end or at the end.

• Screw

• Wedge

• Lever

• Inclined Plane

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Examples of this simple machine are used to hold things together. It is made up of an inclinded plane wrapped around a cylider.

• Wheel and Axle

• Pulley

• Inclined Plane

• Screw

What is the mechanical advantage of a machine?

• The ratio of the input work to the output work.

• The ratio of the output force to the input force.

• The ratio of the input force to the output work.

• The ratio of the output work to the input work.

How is power related to work?

• Power is the force that opposes motion.

• Power is the distance work can cause an object to move.

• Power is how quickly work is done.

• Power is the force applied by a machine.

Tags

NGSS.MS-PS3-5

What is mechanical advantage?

• The ratio of output force to input force

• The sum of input and output forces

• The difference between input and output forces

• The product of input and output forces

Tags

DOK Level 1: Recall

How much work is produced when 350 N is used to move a car 5 m (W=Fd)?

• 70 J

• 1750 J

• 355 J

• 175 J

What is the formula to calculate work done by a force?

• Work = Force + Distance

• Work = Force - Distance

What is the formula for calculating work?

• Work = Distance / Force

• Work = Force + Distance

• Work = Force x Distance

• Work = Force - Distance