Question

What is the mass of a falling rock if it produces a force of 147 N

Answer 1

Concept:

• Free fall
• Any motion of a body in which gravity is the only force acting on it is referred to as free fall in Newtonian physics.
• A body in free fall experiences no force according to general relativity, which reduces gravitation to space-time curvature.
• Gravitational force

Given:

• Acceleration due to gravity g = 9.8 m/s²
• Force produced by the falling rock = 147 N
• Only gravity acts on the rock and no initial velocity is given to the rock.

Find:

• The mass of the falling rock

Solution:

Gravitational force = mass * acceleration due to gravity

F = mg

m = F/g

m = 147/ 9.8

m = 15 kg

The mass of the falling rock is 15 kg.  

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