Work, Energy and Power

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

Statement above refers to

• Work

• Energy

• Power

Which of the following is a unit for work?

• J

• Nm

• W

Tags

NGSS.MS-PS3-5

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

• 3J

• 30J

• 300J

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

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 type of energy posses by the spring?

• Gravitational potential energy

• Elastic potential energy

• Kinetic energy

Tags

NGSS.MS-PS3-2

8cm is an original length of the spring.

The spring is then compresses until 4cm long.

What is the compression of spring?

• 4 cm

• 6 cm

• 8 cm

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

What is the SI unit for power?

• J s-¹

• W

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

NGSS.MS-PS3-5

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