Define force? Explain different kinds of forces with
Suitable example. please explain briefly
Answers
Answer:
Force:
- It is a push or pull on an object that produces acceleration in the body on which it acts.
- S.I. unit of force is Newton.
- A force can do three things on a body.
(a) It can change the speed of a body.
(b) It can change the direction of motion of a body.
(c) It can change the shape of a body.
Types of Forces:
Forces can be divided into primarily into two types of forces:
- Contact Forces
- Non-contact Forces
Contact Forces
Any types of forces that require being in contact with another object come under ‘Contact Force’. All mechanical forces are contact forces. Contact forces further divide into following types of forces:
- Muscular Forces
Muscles functions to produce a resulting force which is known as ‘muscular force’. Muscular force exists only when it is in contact with an object. We apply muscular force during the basic day to day work of our life such as breathing, digestion, lifting a bucket, pulling or pushing some object. Muscular force comes in handy to simply our work.
- Frictional Forces
When an object changes its state motion, ‘frictional force‘ acts upon. It can be defined as the resisting force that exists when an object is moved or tries to move a surface. The frictional force acts as a point of contact between two surfaces that is it arises due to contact between two surfaces. Examples lighting a matchstick or stopping a moving ball come under frictional force.
- Normal Force
When a book is lying on the table, even though it seems that it’s stationary, it’s not. An opposing force is still acting on the book wherein the force from gravity is pulling is towards the earth. This force is the ‘normal force’.
- Applied Force
When you push a table across the room, you apply a force that acts when it comes in contact with another object. This is ‘applied force’; i.e. a force that is applied to a person or object.
- Tension Force
Tension is the force applied by a fully stretched cable or wire anchored on to an object. This causes a ‘tension force‘ that pulls equally in both directions and exerts equal pressure.
- Spring Force
Force exerted by a compressed or stretched spring is ‘spring force’. The force created could be a push or pull depending on how the spring is attached.
- Air Resisting Force
Air resisting forces are types of forces wherein objects experience a frictional force when moving through the air. These forces are resistive in nature.
Non-Contact Forces
The types of forces that can be exerted without requiring any contact with any object are ‘non-contact forces’. They further divide into following types of forces:
- Gravitational Force
Gravitational force is an attractive force that can be defined by Newton’s law of gravity which states that ‘gravitational forces between two bodies are directly proportional to the product of their masses and inversely proportional to the square of the distance between them’. It is a force exerted by large bodies such as planets and stars.
Example: water droplets falling down
Mathematically, Fg ∝ m1m2 or Fg ∝ 1/r2
- Magnetic Force
The types of forces exerted by a magnet on magnetic objects are ‘magnetic forces’. They exist without any contact between two objects.
- Electrostatic Force
The types of forces exerted by all electrically charged bodies on another charged bodies in the universe are ‘electrostatic forces’. These forces can be both attractive and repulsive in nature based on the charge of the bodies.
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: Contact Force. Non-Contact Force.