force and pressure

Question 1

what are contact forces?

Answer 1

forces which act only when objects are in physical contact with each other and bring about changes

Question 2

types of contact force

Answer 2

1. muscular force
2. mechanical force
3. frictional force

Question 3

what is mechanical force?

Answer 3

the force exerted by a machine to do some work

Question 4

muscular force

Answer 4

the force exerted due to the action of the muscles is known as muscular force

Question 5

frictional force

Answer 5

the force acting along the 2 surfaces in contact which opposes the motion of one object over the other

Question 6

what is not-contact force

Answer 6

force which can act even when objects are not in physical contact which each other and bring about changes.

Question 7

types of non contact force

Answer 7

• magnetic force
• electrostatic force
• gravitational force

Question 8

electrostatic force

Answer 8

the force exerted by a charged body to another charged or uncharged body is called electrostatic force

Question 9

gravitational force

Answer 9

the force with which two objects attract each other is called gravitational force

Question 10

pressure

Answer 10

the physical quantity to measure force per unit area is called pressure

Question 11

what are the two factors that pressure depends on?

Answer 11

1. the greater the force the greater its effect

2. the smaller the area of contact the greater its effect

Question 12

formula to find pressure.

Answer 12

P= F/A

Question 13

what is lateral pressure

Answer 13

sideways pressure exerted by liquid on the walls of the containers is called lateral pressure

Question 14

atmospheric pressure

Answer 14

the pressure exerted by the air due to its own weight