What is the definition of work?

• doing homework
• the use of force to move an object over a distance
• sweeping the floor

This is an example of work:

• lifting a box
• pushing on a door that isn't moving
• riding a lawn mower

Tags

NGSS.HS-PS2-1

A ____________ is a machine with no or few moving parts.

• complex machine
• fast machine
• simple machine

A ___________ is a bar that pivots on a fixed point. 

• wheel and axle
• pulley
• lever
• wheel

What is the fulcrum on a lever?

• the point that doesn't move
• the bar
• the part that is moving

Here is an example of a lever:

• riding lawn mower
• wheel on a car
• scissors
• dishwasher

Which of these below are levers?

• pry bar, scissors, mop
• toy car, spring scale
• kleenex, box, eraser

Is a baseball bat a lever?

• yes
• no

How would a screwdriver be used as a lever?

• to screw in a screw on a board
• to lift the lid off a can of paint
• to hit a nail

Is a broom a lever?

• yes
• no