Work, Power, Machines

The fixed point on a lever is called the __________.

• Bar

• Wedge

• Fulcrum

• Screw

A ___________ is a wheel with a rope wrapped around it that can be used to lift or PULL heavy objects by changing the direction or amount of force.

• Lever

• Wedge

• Pulley

• Inclined Plane

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A __________ is a bar that moves around a fixed point in order to push, pull, or move things.

• Pulley

• Lever

• Wedge

• Screw

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

An __________________ is a flat surface that is raised higher at one end in order to move objects up or down.

• Lever

• Pulley

• Inclined Plane

• Wedge

The lever class in the picture is _?_.

• 1
• 2
• 3

The lever class in the picture is _?_.

• 1
• 2
• 3

Tags

NGSS.MS-PS2-2

The lever class in the picture is _?_.

• 1
• 2
• 3

Tags

NGSS.MS-PS2-1

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

If the weight of the block is 10N, how much force does one have to apply to lift it using this pulley (MA=2)?

• 2N
• 5N
• 10N
• 15N

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

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 (MA=Output Force/Input Force)?

• 1

• 10

• 100

• 1000

Tags

NGSS.MS-PS2-2