Work, Power, & Energy

How can simple machines make work easier?

• by decreasing the force needed to complete the task

• by increasing the friction between the machine and the object

• by adding more work on the object than originally applied

• by removing the force of gravity on the object

Tags

NGSS.MS-ETS1-1

Which simple machine would be the MOST efficient for lifting an object 30 meters off the ground?

• pulley

• screw

• wedge

• lever

Tags

NGSS.MS-ETS1-2

A car speaker is an example of this type of ENERGY

• Thermal

• Nuclear

• Elastic

• Sound

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

a ball on the top of a building has this type of ENERGY

• Electrical

• Sound

• Thermal

• Gravitational Potential Energy

Tags

NGSS.MS-PS3-2

NGSS.MS-PS2-4

A bow has this type of ENERGY

• electrical

• chemical

• sound

• elastic

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

gasoline has this type of ENERGY

• chemical

• nuclear

• gravitational potential

• electromagnetic

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

TRUE or FALSE. Potential energy is stored energy. It is relative to its position and location.

• True

• False: Potential energy is energy in motion.

Tags

NGSS.MS-PS3-2

When you consume food, is that a form of chemical potential energy?

• Yes, because the food chemically breaks down inside your body helping your body store energy to use when needed.

• No, because your body digests the food you eat and does not store the energy for future consumption.

Tags

NGSS.MS-LS1-7

A strongman exerts 1500 N on the side of a building. After 2 minutes, the building doesn't move. How much work did he do?

• 180,000 J

• 0 J

• 750 J

• 1500 J

A kid applies a force of 70 N to a ball over 1.1 meters. How much work did he do on the ball? 

• 77 J
• 7.7 J 
• 0.7 J 
• 770 J 

Tags

NGSS.HS-PS3-2