Energy, Work and Simple Machines

Which of the following is a type of simple machine?

• Pulley

• Battery

• Magnet

• Light bulb

Which of the following is NOT a simple machine?

• Screw

• Lever

• Gear

• Wedge

What is the law of conservation of energy?

• Energy can be created but not destroyed

• Energy can be destroyed but not created

• Energy cannot be created or destroyed, only transformed

• Energy is always lost as heat

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which of the following is an example of energy transformation?

• A book sitting on a table

• A battery powering a flashlight

• A ruler measuring length

• A magnet attracting iron

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A wind-up toy car moves after being wound up. What type of energy transformation is this?

• Chemical to electrical

• Elastic potential to kinetic

• Thermal to mechanical

• Gravitational to sound

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

Which energy transformation occurs when you rub your hands together and they become warm?

• Electrical to chemical

• Mechanical to thermal

• Chemical to light

• Sound to mechanical

Tags

NGSS.MS-PS3-5

Tags

NGSS.MS-PS3-5

A person uses a ramp to load a box into a truck. Which simple machine is being used?

• Pulley

• Inclined plane

• Lever

• Wedge

Tags

NGSS.MS-PS2-1

Which of the following best demonstrates the conservation of energy?

• A ball rolling to a stop due to friction

• A light bulb converting electrical energy to light and heat

• A battery running out of charge

• A car using gasoline

Tags

NGSS.MS-PS3-5

If you use a lever to lift a heavy rock, what advantage does the lever provide?

• Increases the weight of the rock

• Reduces the amount of work needed

• Changes the direction of the force and makes lifting easier

• Increases the distance the rock moves

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2