- Within elastic limit ….. is directly proportional to the strain.
- The strain produced is proportional to the ………. .
- The force applied to an elastic body is called ………. .
- The ratio of the load to ……. is defined as mechanical advantage.
- The ……… of a machine is always less than 100%.
- One ……… is equal to a rate of energy transfer of 1 joule per second.

35.The SI unit of power is ……… .
- The SI unit of the mechanical power is ……. .
- If the work done in 1 second is ……. the power is 1 watt.
- The strain produced is proportional to the ……… .
- The rate of doing work is defined as ………. .

There are ……….. fundamental forces.

(13) The gravitational force is a ……… range force .

(14) Weight has both magnitude and ………. .

(15) The SI unit of weight is ……… .

(16) Mass is a scalar quantity and its SI unit is ……… .

(17) The gravitational force interact between ………. .

(18) The weight of 50 kg mass is ……….. .

(19) The nuclear force is a ……. range force.

(20) The ratio of mass to volume is defined as ……… .

(21) The density of ice is ……….. than that of water.

(22) The symbol of density is ρ and it is a ……..