Energy, Work and Power

How do you calculate power?

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

How do we calculate work?

• W = F * d
• w = f * D
• W = F * D
• w = f * d

How much work is being done with 200 N of force over 426 meters?

• 85,200 J
• 45,620 J
• 90,480 J
• 62,329 J

Tags

NGSS.HS-PS3-1

The SI unit of work is?

• Joules
• Watts
• Newtons
• meters

Gravitational potential energy depends on the ________ and ________ of the object. 

• Height and mass
• Friction and movement
• Mass and Movement
• Height and Friction 

Tags

NGSS.MS-PS3-2

NGSS.MS-PS2-4

Elastic potential energy is energy stored in object that are compressed or __________. 

• movement
• stored
• harnessed
• pulled 

Tags

NGSS.MS-PS3-2

Why does the total amount of mechanical energy stay constant in a system?

• energy is not created or destroyed
• energy leaves
• energy enters
• energy is not converted from one form into another

Tags

NGSS.MS-PS3-5

What is the formula for calculating the total amount of mechanical energy?

• ME = KE + PE
• KE = ME + PE
• PE = KE + ME
• ME = 1/2 mv²

Tags

NGSS.MS-PS3-5

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

Which situation is work not done?

• lifting a 20 pound box off the floor
• holding a 20 pound box above the floor
• sliding a 20 pound box across the floor
• sliding a 20 pound box up an inclined plane