Question

PHYSICS ACTIVITY

Write a note on "Type of forces and examples "
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Answer 1

Answer:

Force is a physical cause that can change the state of motion or the dimensions of an object. There are two types of forces based on their applications:

1) Contact Force

2) Non-Contact Force

Forces that act on a body either directly or through a medium are called contact forces.

Examples of contact forces are:

a) Muscular Force

b) Mechanical Force

c) Frictional Force

Forces that act through spaces without making direct contact with the body are called non-contact forces.

Examples of non-contact forces are:

a) Gravitational Force

b) Electrostatic Force

c) Magnetic Force

Answer 2

Answer:

 

The friction force is the force exerted by a surface as an object moves across it or makes an effort to move across it. There are at least two types of friction force - sliding and static friction. Thought it is not always the case, the friction force often opposes the motion of an object. For example, if a book slides across the surface of a desk, then the desk exerts a friction force in the opposite direction of its motion. Friction results from the two surfaces being pressed together closely, causing intermolecular attractive forces between molecules of different surfaces. As such, friction depends upon the nature of the two surfaces and upon the degree to which they are pressed together. The maximum amount of friction force that a surface can exert upon an object can be calculated using the formula below:

Explanation: