Home | | Science 10th Std | Solved Problems on Laws of Motion

# Solved Problems on Laws of Motion

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 sâ€“1.

Solution: Linear momentum = mass Ă— velocity

Velocity = linear momentum / mass. Vâ€‰= 2.5 / 5 = 0.5 m sâ€“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 Ă— d

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

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

Problem 3 : At what height from the centre of the Earth the acceleration due to gravity will be 1/4th 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
Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail
10th Science : Chapter 1 : Laws of Motion : Solved Problems on Laws of Motion | Science