What is force? State the difference between contact and non contact force with an example.
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Answer:
Difference between Contact and Non-Contact Forces
Contact forcesNon-contact forceContact force occurs due to the contact between two different objects.Non-contact force occurs due to either attraction or repulsion between two objects such that there is no contact between these objects.
In physics, a force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity. Wikipedia
Other units: dyne, pound-force, poundal, kip, kilopond
In SI base units: kg·m/s2
Common symbols: F→, F, F
Derivations from other quantities: F = m a
SI unit: Newton
Difference between Contact and Non-Contact Forces
There is no field linked with the contact force. There is always a field linked with non-contact force. The frictional force is an example of a contact force. Gravitational force is an example of a non-contact force.