Chapter 5: Work, Energy & Power

The work done is zero if

• The body shows displacement in the opposite direction of the force applied.

• The body shows a displacement in perpendicular direction to the force applied.

• The body shows displacement in the same direction as that of the force applied.

• The body masses obliquely to the direction of the force applied.

The unit of work is joule. The other physical quantity that has same unit is

• Power

• Velocity

• Energy

• Force

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NGSS.HS-PS3-2

A ball is dropped from a height of 10 m

• Its potential energy increases and kinetic energy decreases during the falls

• Its potential energy is equal to the kinetic energy during the fall.

• The potential energy decreases and the kinetic energy increases during the fall.

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NGSS.MS-PS3-1

NGSS.MS-PS3-5

"the work done by the net force on a body equals the change in the body’s kinetic energy" this is the statement for?

• Power

• Energy

• Work done

• Work Energy Theorem

Which of the following is the equation of power (can tick more than 1)

• $P\ =F\ \cdot s$

• $P\ =\ F\ \cdot v$

• $P\ =\frac{E}{t^2}$

• $P\ =\ \frac{E}{t\ }$

Area under the curve of force-displacement graph is equal to

• Displacement

• Work

• Power

• Energy

Work done will be maximum if the angle between the force F and displacement d is

• $45\degree$

• $90\degree$

• $180\degree$

• $0\degree$

When a force is parallel to the direction of motion of the body, then work done on the body is:

• Zero

• Minimum

• Infinity

• Maximum

Tags

NGSS.HS-PS3-1

The work done is said to be negative when force and displacement are

• Parallel

• Anti-parallel

• Perpendicular

• None

Work done on the body equals to the

• Change in its K.E always

• Change in its P.E always

• Change in it K.E and change in its P.E

• Neither change in K.E nor change in its P.E

Tags

NGSS.HS-PS3-1

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