General Physics

Question 1

For constant motion

Answer 1

v = s / t
‘v’ is the velocity in m/s,
‘s’ is the distance or displacement in meters
‘t’ is the time in seconds

Question 2

For acceleration ‘a’

Answer 2

a = v-u /t

u is the initial velocity, v is the
final velocity and t is the time

Question 3

Graph

Answer 3

Area of a rectangular shaped graph
= base × height.
Area of triangular shaped graph =
½ × base × height

*note: In velocity-time graph the area
under the graph is the total
distance covered by an object.

Question 4

Weight and mass

Answer 4

w = m x g

w is the weight in newton (N),
m is the mass in kg
g is acceleration due to gravity = 10 m/s2

Question 5

Density ‘ρ’ in kg/m3

Answer 5

ρ = m/v
m is the mass
V is the volume

Question 6

Force ‘F’ in Newton (N)

Answer 6

F = m x a
m is the mass
a is the acceleration

Question 7

Terminal velocity

Answer 7

Weight of an object (downward) = air resistance (upwards)

Question 8

Hooke’s law

Answer 8

F = k × ݇x
F is the force,
x is the extension in meters
k is the spring constant.

Question 9

Moment of a force in N.m

Answer 9

moment of force = f x d
F is the force
d is the distance from the pivot

Question 10

Law of moment or equilibrium

Answer 10

Total clockwise moment = total anticlockwise moment

F1 x d1 = F2 x d2

Question 11

Work done W joules (J)

Answer 11

W = f x d
F is the force
d is the distance covered by an object

Question 12

Kinetic energy Ek in joules j

Answer 12

Ek = 1/2 x m x v2

m is the mass(kg)
v is the velocity (m/s)

Question 13

Potential energy Ep in joules (J)

Answer 13

Ep = m x g x h

m is the mass (kg)
g is the acceleration due to gravity
h is the height from the ground

Question 14

Law of conservation of energy

Answer 14

Loss of Ep = gain of Ek

m x g h = 1/2 x m v2

Question 15

Power in Watts (W)

Answer 15

P = Work done / time taken

P - Energy transfer / time taken

*Power is the rate of doing work

Question 16

Pressure in Pascal (Pa)

Answer 16

P = F / A
F is the force in newton(N)
 A is the area in m2

Question 17

Pressure p due to liquid

Answer 17

p = ρ x g x h
ρ is the density in kg/m3
g is the acceleration due to gravity
h is the height or depth of liquid in meters.

Question 18

Atmospheric Pressure

Answer 18

P=760mmHg = 76cm Hg =1.01 x 10*5 Pa