Physics-definition and formulae

Question 0

Centre of gravity

Answer 0

The point where whole weight of the object may be considered to act.

Question 1

The torque of a couple

Answer 1

The product of one of the two forces and the perpendicular distance between them which is known as couple arm.

Question 2

The principle of moments

Answer 2

For any object that is in equilibrium,the sum of the clockwise moments about any point equals the sum of the anti clockwise moments about the same point.

Question 3

Time of flight

Answer 3

t=(2·u·sin x)/g

Question 4

Range of projectile

Answer 4

x=[(u^2)·sin2x]/g

Question 5

Height of projectile

Answer 5

y=[(u^2)·(sin^2)x]/2g

Question 6

To form a couple, the two forces must be:

Answer 6

Equal in magnitude
Parallel, but opposite in direction
Separated by a distance d.

Question 7

Young modulus

Answer 7

The ratio of stress to strain.

Question 8

Known three of v, u, a, t.

Answer 8

v=u+at

Question 9

Known three of s, u, v, t.

Answer 9

s=[(u+v)t]/2

Question 10

Known three of s, u, a, t.

Answer 10

s =ut+1/2 at^2

Question 11

Known three of s, u, v, a.

Answer 11

v^2=u^2 +2as

Question 12

Moment of a force

Answer 12

The moment of a force = force x perpendicular distance of the pivot from the line of action of the force.