Work and Machines

The use of force to move an object over distance is ______

• work

• efficiency

• speed

• power

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

What formula is used to calculate work?

• force divided by time

• force multiplied by distance

• force divided by distance

• power divided by time

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

What is the SI unit for measuring work?

• Watt

• Joule

• Pascal

• Newton

What is power?

• The amount of work done in a certain amount of time.

• The ability to do work.

• Force applied over distance

• A push or a pull on an object with mass that results in a change of velocity

Anything that makes work easier is a ______

• force

• machine

• watt

• bad idea

How many types of simple machines are there?

• 3

• 4

• 5

• 6

Pulleys are a type of simple machine.

• True

• False

The three types of pulleys are... (choose 3)

• moveable

• fixed

• floating

• compound

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

How do you calculate the mechanical advantage of a pulley?

• Counting the number of rope segments pulling up on the load

• Multiplying the distance the load is lifted by the time it took to lift it.

• Dividing the mass of the load by the force it took to lift it.

• Multiplying the mass of the load by the work applied to the pulley.

A machine will always do ___ work on an object than the user does on the machine

• more

• less

• the same amount