Physics Work Energy Power

Mr. B's and Mr. P's classes competed in a game of tug of war. Mr. B's class pulled to the right with a force of 4,000 N. Mr. P's class pulled to the left with a force of 5,000 N. As a result the rope moved 5.1 m to the left. How much work was done by the net force?

• 4100 J

• 3100 J

• 5100 J

• 45900 J

Tags

NGSS.MS-PS2-2

How are work and energy related? 

• The work done by an external force acting on an object causes a change in the mechanical energy of the object.

• Work is the same thing as energy.  They are equal. 

• Energy is m*g*h, and work is 1/2*m*v²

Tags

NGSS.MS-PS3-5

If you pull the trolley along a flat floor horizontally. Which force do you use to calculate the work done.

• Weight

• Pulling force

Tags

NGSS.MS-PS3-5

If the net work done on an object is negative, then the object’s kinetic energy:

• decreases

• remains the same

• increases

• is zero

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A 10 kg mass is lifted to 3 m. What is its weight? What is its potential energy? How much work is being done?

• Weight = 30 N

  PE = 30 J

  Work = 294 J

• Weight = 10 kg

  PE = 10 J

  Work = 30 J

• Weight = 98 N

  PE = 294 J

  Work = 294 J

• Weight = 98 N

  PE = 294 J

  Work = 30 J

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-4

A 16 N force is applied to an object and 96 J of work is done. How far was the object moved?

• 6 m

• 16 m 

• 80 m 

• 1536 m 

What is the definition of power?

• Power is the product of force and velocity.

• Power is the product of force and work done per unit time.

• Power is the product of force per unit time and velocity.

• Power is the rate at which work is done.

A 5000N block is lifted 10 m. Calculate the work done.

• 50000 J

• 5000 J

• 500 J

• 50 J

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

How much work is produced when 350 N is used to move a car 5 m (W=Fd)?

• 70 J

• 1750 J

• 355 J

• 175 J

A man carries a box across a room at constant velocity. Is work being done on the box by the man?

• Yes

• No

• Half of the time

• Not enough information