Work, power and energy

For work to be performed, energy must be ….

• transferred from one place to another

• concentrated

• transformed from one type to another

• destroyed

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

NGSS.MS-PS3-3

Joule is the unit of …

• force

• work

• power

• energy

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

Which of the forces involved in dragging a heavy object on a smooth, horizontal surface, have the same magnitude?

• the horizontal applied force

• gravitational force

• reaction force in vertical direction

• force of friction

Power is a measure of the ...….

• the rapidity with which work is done

• amount of energy required to perform the work

• The slowness with which work is performed

• length of time

While dragging or lifting an object, negative work is done by

• the applied force

• gravitational force

• frictional force

• reaction force

Tags

NGSS.MS-PS3-5

The potential energy of your body is least when you are …..

• sitting on a chair

• sitting on the ground

• sleeping on the ground

• standing on the ground

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-2

The total energy of an object falling freely towards the ground …

• decreases

• remains unchanged

• increases

• increases in the beginning and then decreases

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

If we increase the velocity of a car moving on a flat surface to four times its original speed, its potential energy ….

• will be twice its original energy

• will not change

• will be 4 times its original energy

• will be 16 times its original energy.

Tags

NGSS.MS-PS3-1

The work done on an object does not depend on ….

• displacement

• applied force

• initial velocity of the object

• the angle between force and displacement

Tags

NGSS.MS-PS3-5