Work and Power and Simple Machines

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-ETS1-2

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-ETS1-2

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

A heavy object could be rolled up this simple machine, instead of lifting it straight up. Using this simple machine can save effort, although the object must usually cover more distance if this simple machine is used.

• Inclined plane

• Pulley

• Screw

• Wheel & Axle

Tags

NGSS.MS-PS2-2

This is necessary to get something moving.

• screw

• resistance

• force

• wedge

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A rod attached to the center of a wheel is called?

• a magnet

• a top

• a wedge

• an axle

Tags

NGSS.MS-ETS1-2

What should you do to reduce the amount of effort needed to lift something using a first class lever?

• move the fulcrum to the middle of the lever

• move the fulcrum closer to the effort

• Lift the item with your arms

• move the fulcrum closer to the load

The efficiency of a Simple Machine is

• is equal to 100%

• is always more than 100%

• Always less than 100%

• is always 50%

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%

Which of the following statements is true for the picture.

• B - is the fulcrum, A - is the effort, C - is the resistance

• B - is the resistance, A - is the fulcrum, C - is the effort

• B - is the resistance, C - is the fulcrum, A - is the effort

• B - is the fulcrum, A - is the resistance, C - is the effort