Physics Work and Power

What is the difference between calculating power and work?

• Power takes into account the time it takes to complete a task

• Work takes into account the time it takes to complete a task

• Power is force/area

• Work is force/area

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

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.HS-PS2-1

NGSS.HS-PS3-1

NGSS.HS-PS3-2

Rank the scenarios from least to greatest kinetic energy right before they hit the ground

• 2<3<1<4

• 2<1<3=4

• 2<1<3<4

• 1=2=3=4

Tags

NGSS.MS-PS3-1

In which of the following situations do your arms do work on books?

• holding a heavy stack of books while standing

• carrying a heavy stack of books

• dropping a stack of books onto a table

• picking up a pile of books from the floor

Tags

NGSS.MS-PS3-5

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

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

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.

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 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 

Tags

NGSS.MS-PS2-2

A bulldozer does 30,000 J of work over a distance of 20 meters. How much force did it apply?

• 1500 N

• 2000 N

• 1000 N

• 2500 N

Answer explanation

To calculate force, use the formula: Force = Work / Distance. Therefore, Force = 30,000 J / 20 m = 1500 N. The correct answer is 1500 N.