Chapter - 5

Work is the product of

• force and distance moved

• force and mass

• mass and velocity

• force and area

1 J is equivalent to

• 10⁴ ergs

• 10⁵ ergs

• 10⁶ ergs

• 10⁷ ergs

The SI unit of work is --------.

(a)  

Work is a ---- quantity.

(a)  

When an angle makes between force and motion , work formula is

• W = F s

• W = F s cos θ

• W = 0

• W = - F s

When the direction of the force and the motion are the same, work is

• W = 0

• W = - F s

• W = F s

Mechanical energy is divided into ---- types .

• 2

• 3

• 4

The potential energy due to configuration is called

• potential energy

• kinetic energy

• elastic potential energy

• gravitational potential energy

Flying bird has

• gravitational potential energy

• kinetic energy

• potential energy

• elastic potential energy

Kinetic energy formula is

• m g h