Mechanical Energy and Work

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

if you push a cart with a force of 60 N for 2 m... how much work have you done

• 120 J

• 30 J

• 120 N 

• 30 N

Tags

NGSS.MS-PS3-4

NGSS.MS-PS2-2

A 5000N block is lifted 10 m. How much work was done?

• 50000 J

• 5000 J

• 500 J

• 50 J

Tags

NGSS.MS-PS3-5

How much work is produced when 350 N is used to move a car 5 m?

• 70 J

• 1750 J

• 355 J

• 175 J

A 8.6 kg box is pushed across a floor 3.2 m with a force of 5.5 N. How much work is done on the box?

• 17.6 J

• 8.7 J

• 1.72 J

• No work is done.

Tags

NGSS.MS-PS3-4

A student carries a 10.5 kg book bag 15.3 m. How much work is done on the book bag by the student?

• No work is done.

• 160.65 J

• 1.46 J

• 25.8 J

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

If the direction an object is displaced is the same as the direction of a force applied to it:

• Positive work is done.

• Negative work is done.

• No work is done.

If the direction of an applied force is anti-parallel (opposite) to the direction an object is moving:

• Negative work is done.

• Positive work is done.

• No work is done.

If the direction an object is displaced is perpendicular to the direction of a force applied to it:

• No work is done.

• Positive work is done.

• Negative work is done.

How much power is required to do 40.2 J of work in 3.3 s?

• 12.18 W

• 132.66 W

• 43.5 W

• 0.08 W