Question

6.4 KJ of energy causes a displacement of 64m in a body in the direction of force in 2.5 seconds calculate (i) the force applied . (ii) the power in horse power.

Answer 1

1) Force = energy by displacement = 6400 by 64 = 100 N

2) Power = work done by time = 6400 J by 2.5 S

= 64 × 100 by 25 = 2560 W

=2560 by 746 HP = 3.43 HP

Answer 2

i.) Force = 6400/64 = 100 N

As, force= energy/body displaced.

ii.) Power = work done = 6400/2.5 = 2560 W

Converting to horsepower we get,

(2560/746) H.P = 3.431 Watt.

Force is a physical phenomenon that occurs when it is not opposed, will change the motion of an object and by which a work is done. A force can cause an object with mass to change it to accelerate.