Work, Power, Machines Practice 14.1-4

What is the fixed point around which a lever is free to turn?

• fulcrum
• resistance
• effort
• lever

One or two inclined planes that move when used. Thick at one end and thin at the other.

• wedge
•   screw
• wheel and axle 
• pulley

A wheel attached to a shaft. A doorknob is an example.

• wedge
• screw
• wheel and axle 
• pulley

An inclined plane wrapped around a straight piece of metal.

• wedge
• screw
• wheel and axle
• pulley

Tags

NGSS.MS-PS2-2

Rope, chain, or belt wrapped around a wheel that changes the direction of an applied force. Movable or fixed types.

• wedge
• screw
• wheel and axle
• pulley

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A simple machine is a device that helps to reduce the amount of _____ required to do work.

• force
• energy
• work

Which statement correctly explains a compound machine?

• A compound machine is made up of one or more simple machines
• A compound machine is made up of two or more simple machines.
• A screw is a type of inclined plane.
• None of the above

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

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

What is a machine?

• an object that has Artificial Intelligence.

• an object that is designed to take over the earth in 2050.

• a device that changes force by reducing it over a larger distance.

• a mechanism that is used to decrease the amount of work done.

Tags

NGSS.MS-PS3-5