Question

Explain primary concept of force.​

Answer 1

Explanation:

Given:u=−10cm               f=20cm        (convex lens)

To find: v and image's nature.

Solution: From lens formula

v1−u1=f1

v1+101=201

v1=20−1

v=−20cm

And magnification = uv=2

Hence image formed is virtual, erect and magnified two times.

Example 3 Solve the equation x2 – 7x = 0 Factorising , x ( x – 7 ) = 0 either r = 0 orx - 7 = 0 x = 7 The solutions are x = 0 and x = 7 . ( a ) Solution by ...

Answer 2

Answer:

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A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. ... Forces only exist as a result of an interaction.

Frictional Force: Gravitational Force

Tension Force: Electrical Force

Normal Force: Magnetic Force

Contact Forces: Action-at-a-Distance Forces