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JAMB Physics 2014 Paper

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Question : 7

Total: 41

An object of weight 8kg on earth is taken to a planet where acceleration due to gravity is one-third of its value on earth. The weight of the object on the planet is

48N
12N
27N
36N

Solution:

Concept:

Weight is the force of gravity, given by

W = mg

. If gravity becomes one-third, weight becomes one-third.

Explanation:

Take the acceleration due to gravity on earth as

g \approx 10 \, \text{m/s}^2

.

The object's mass is

m = 8 \, \text{kg}

.

On earth:

W_{\text{earth}} = mg = 8 \times 10 = 80 \, \text{N}

.

On the planet:

g_{\text{planet}} = \frac{g}{3}

.

So,

W_{\text{planet}} = m \times \frac{g}{3} = \frac{80}{3} \approx 26.7 \, \text{N}

.

This is approximately

27 \, \text{N}

.

Answer:

C. 27N

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