The force and pressure chapter is related to class 8th. What does one mean by force and pressure? What are different types of force?
Force and Pressure:
Meaning
- When we pull or push any item, then it is called force.
- Or, when there is any interaction between objects, it develops force.
- The force’s strength is always called magnitude.
Types
Contact force:
When we touch any item, then it moves. Well, it is known as contact force.
For example, Pulling, Lifting, Kicking and Pushing.
Muscular force:
When we apply force with the help of our muscles, it is called muscular force.
For example, Magnetic force gravitational force.
Nuclear forces:
- It is the force that will act between all the particles.
- The particles consist of protons, neutrons, and many others.
Non-contact forces:
- The force which does not make any contact.
- LIKE: Magnetic force, gravitational force, an electrostatic force.
Pressure
It is the per-unit force over an area.
- The formula for pressure: Force/Area.
- The unit of force is Pascal.
Distribution (Pressure):
- The force which acts on the smaller area has more pressure.
- Example: Porters, sharper knife
Force and Pressure Sample Questions for Class 8
Question 1
Friction can be increased by:
A. making the surfaces rough
B. using dry surfaces
C. increasing the weight
D. all of these
Question 2
A car accelerates on a horizontal road due to the force exerted by:
A. the engine of the ear
B. the driver of the car
C. the earth
D. the road
Question 3
A body floats in water because:
A. no force is acting on it
B. the net force acting on this body is zero
C. of gravitational pull
D. friction between body and the water
Question 4
Force and Pressure Worksheet-2
Force and Pressure Worksheet-2
The atmospheric pressure is due to the:
A. sky above our head
B. air mass surrounding earth
C. gravitational force of sun and other planets
D. mass of the earth
Question 5
In which of the following cases the net force is not equal to zero?
A. A kite skillfully held stationary in the sky
B. A ball falling freely from a height
C. A helicopter hovering above the ground
D. A cork floating on the surface of water