Force,Types of force with an Example

Topic :- Force

In physics, a force is a push or pull that can cause an object with mass to change in velocity.

Types of Force :-

---

electromotive force

the force that, by reason of differences in potential, causes a flow of electricity from one place to another, giving rise to an electric current.

moment of force

the effect of a force exerted on a lever and about a fixed point.

reserve force

energy above that required for normal functioning. In the heart it is the power that will take care of the additional circulatory burden imposed by bodily exertion.

shearing force

a force exerted perpendicularly to a horizontal surface.

Here is a problem which shows,how to find force

1. 10 kg lawn mower is pushed along by a force applied at a 20° angle to the horizontal. If the mower accelerates at 3.4 m/s^2. what is the force?

ANSWER: 107.33N

Mass=10kg

Angle=20 °

Acceleration =3.4m/sec^2

F sin (theta) =mg

        mg
F=   ---------
     sin θ

       10*9.8
=     ---------
     sin (20)
      98
=   -------
     sin (20)

F =107.33N (Answer)

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