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Science - Solved Problems on Laws of Motion | 10th Science : Chapter 1 : Laws of Motion

Chapter: 10th Science : Chapter 1 : 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 s–1.

Solution: Linear momentum = mass × velocity

Velocity = linear momentum / mass. V = 2.5 / 5 = 0.5 m s–1

 

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

Solution:

Formula: The moment of a force M = F × d

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

Hence, moment of the force = 40 × 0.9 = 36 N 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, Rʹ = R + h

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


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

 

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