Work, Power, and Energy-Remote 20/21

How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?

• 15 J
• 45 J
• 0 J
• 5 J

Bob (80 kg) uses 180 N of force to get him up the slope. The vertical distance is 2 m and the diagonal is 10 m. Calculate the work he does.

• 1600 J

• 160 J

• 3600 J

• 1800 J

Tags

NGSS.MS-PS3-5

Is this an example of work? 
A waiter carries a tray full of meals above his head by one arm straight across the room at constant speed. 

• True
• False

What type of energy is in this picture?

• Kinetic
• Potential
• Chemical
• Sound

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

The SI Unit for Energy is

• Joule

• Newton

• Calorie

• Watt

A weight-lifter raises a 2000N weight through a vertical height of 2.0m in 0.80s. What useful power does he develop in doing this?

• 800 W

• 700W

• 4000W

• 5000W

Tags

NGSS.HS-PS3-2

Kinetic energy is associated with ---.

• speed

• position

• direction

• temperature

Tags

NGSS.MS-PS3-1

If there is no friction on this track, at which point would the coaster have the most kinetic energy?

• A

• B

• C

• D

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Where is the roller coaster gaining potential energy?

• A to B

• B to C

• C to D

• The roller coaster is always losing potential energy

Tags

NGSS.MS-PS3-2

How do you calculate power?

• P = W/t
• P = E/t
• P = w * t
• P = bbq/chicken