WORK AND ENERGY

In case of negative work the angle between the force and displacement is

• 0 degree

• 45 degree

• 90 degree

• 180 degree

An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are lo m above the ground, they have the same

• Acceleration

• Momentum

• Potential Energy

• Kinetic Energy

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g = 10 ms²)

• 6 × 10³ J

• 6 J

• 0.6 J

• Zero

Tags

NGSS.HS-PS3-1

Which one of the following is not the unit of energy?

• Joule

• Newton Meter

• Kilo Watt

• Kilowatt Hour

The work done on an object does not depend upon the

• Displacement

• Force applied

• Angle b/w force and displacement

• Initial velocity of the object

Tags

NGSS.HS-PS3-2

Water stored in a dam possesses

• No energy

• Electrical energy

• Kinetic Energy

• Potential Energy

Tags

NGSS.HS-PS3-2

A body is falling from a height h. After it has fallen a height h/2, it will possess

• Only potential energy

• Only kinetic energy

• Half potential and half kinetic energy

• More kinetic and less potential energy

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

If speed of a car becomes 2 times, its kinetic energy becomes

• 4 times

• 8 times

• 16 times

• 12 times

Work done by friction

• Increases kinetic energy of the body

• Decreases kinetic energy of the body

• Increase potential energy of the body

• Decreases potential energy of the body

Tags

NGSS.HS-PS3-1

One joule work is said to be done when

• a force on 1 N displaces a body by 1cm

• a force of 1N displaces a body by 1m

• a force of 1dyne displaces a body of 1cm

• a force of 1dyne displaces a body of 1m