What is gravity?

• A mythical creature that only comes out at night.
• A force that pulls all objects off the Earth.
• A force that pulls all objects down to the earth.
• The energy needed to make an object move.

Tags

NGSS.HS-PS2-4

Name this simple machine.

• Lever
• Wedge
• Pulley
• Inclined Plane

Which choice is an example of a pulley?

• Axe
• Seesaw
• Crane 
• Tunnel

Which choice is an example of an inclined plane?

• A ramp
• Seesaw
• Bottle Cap
• Ferris Wheel 

What is the center point of a lever called?

• Fulcrum

• A Thingy

• Cheese

• A Brick

A flat sloping surface that connects lower and higher elevations. It makes raising objects easier.  

• wedge
• screw
• lever
• inclined plane 

How could I reduce the effort force needed to lift the load?

• move the fulcrum away from the load
• move the fulcrum closer to the load
• place the fulcrum in the middle

Tags

NGSS.MS-ETS1-1

Flagpole

• wedge
• pulley
• incline plane
• wheel and axle

Tags

NGSS.MS-PS2-1

What force opposes motion motion and decreases the efficiency of a machine?

• gravity
• friction
• pressure

A door is an example of this class of lever.

• 1st class

• 2nd class

• 3rd class