Work Energy 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

The SI unit of work is?

• Joules

• Watts

• Newtons

• meters

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

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.HS-PS3-2

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

When an object is carried at a constant velocity by a force,

• no work is done on the

  object.

• the work done is maximum on the

  object.

• the work is done minimum on the

  object.

• the work done is 100 % on the

  object.

Tags

NGSS.HS-PS3-2

Which of these items is not part of the law of conservation of energy?

• energy cannot be created

• energy cannot be destroyed

• energy can be transferred between forms

• energy is destroyed by friction

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

NGSS.HS-PS3-4

NGSS.HS-PS3-5

In which of these cases is work being done? 

• A student sleeps

• A student pushes a locked door that does not move

• a student carries his chair into another room

• A student sits on the carpet