Science : Laws of Motion: Solved Problems

**SOLVED PROBLEMS**

**Problem-1: **Calculate the velocity
of a moving** **body of mass 5 kg whose linear momentum is 2.5 *kg* *m*
*s*â€“1.

**Solution: **Linear momentum = mass Ã—
velocity

Velocity = linear
momentum / mass. Vâ€‰= 2.5 / 5 = 0.5 *m s*â€“1

**Problem 2: **A door is pushed, at a
point whose** **distance from the hinges is 90â€‰cm, with a force of 40â€‰N.
Calculate the moment of the force about the hinges.

**Solution:**

**Formula**: The moment of a force
M = F Ã— d

Given: F = 40â€‰N and d =
90 cm = 0.9 m.

Hence, moment of the
force = 40 Ã— 0.9 = 36 Nâ€‰m.

**Problem 3 : **At what height from the
centre of** **the Earth the acceleration due to gravity will be 1/4^{th}
of its value as at the Earth.

**Solution:**

**Data: **Height from the centre
of the Earth,** **RÍ´ = Râ€‰+ h

The acceleration due to
gravity at that height, gÍ´ = g/4

From the centre of the
Earth, the object is placed at twice the radius of the earth.

Tags : Science , 10th Science : Chapter 1 : Laws of Motion

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