Work, Energy, and Power

Which of these is a measure of force?

• 100 newtons

• 100 meters per second

• 100 joules

• 100 watts

Tags

NGSS.MS-PS2-2

It is a product of force and displacement in the direction of force.

Statement above refers to

• Work

• Energy

• Power

Amoy is rowing a boat with a force 50N. If the work done by her is 100J. Calculate the displacement of the boat.

• 2 m

• 20 m

• 200 m

Tags

NGSS.HS-PS2-1

What is the meaning of energy?

• Product of force with displacement

• Ability to do a work

• Rate of work done

Tags

NGSS.MS-PS3-5

A crane lift up a load with weight 2500 N to a 4m height.

Calculate the work done.

• 1000 J

• 10 000 J

• 100 000 J

Tags

NGSS.MS-PS3-4

If a work done by a crane is 1000 J to lift up a load in 2 minutes.

Calculate the power of the crane.

• 500 W

• 8.33 W

When a ball bearing mass 0.2 kg moves with a velocity 6ms-¹

Calculate the kinetic energy of the ball bearing.

• 3.6 J

• 36 J

• 360 J

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

Calculate kinetic energy of a toy with mass 9 kg if its velocity is 2 ms-¹

• 9J

• 18J

• 36 J

Tags

NGSS.MS-PS3-1

Which of the following is a unit for work?

• J

• Nm

• W

If Ali push a sack of rice with a force 15N along 2m distance. Calculate the work done.

• 3J

• 30J

• 300J