This is a suggested solution to the question in GCE O Level Physics Paper 2, Section A, question 4a & b.

## Suggested Solution

**(a)Gravitational**** Field Strength** is defined as the gravitational force acting per unit mass on an object due to the earth’s gravitational pull.

(b) When the Gravitational Field strength was 9.7N/kg, his weight was:

Weight = 9.7N/kg x 80kg

When the Gravitational Field strength was 9.8N/kg, his weight was:

Weight = 9.8N/kg x 80kg

Hence the increase in weight was = 0.1 N/kg x 80 kg =8 N

## Explanation

In this question, it was stated that the skydiver jumped from the edge of space from his space ship and free-fall until he opened his parachute. During the free fall, the gravitational field strength increased from 9.7 N/kg to 9.8 N/kg. Candidates are required to calculate the increate in weight of the diver during his free-fall. As per the definition of gravitational field strength, it is the ** force** acted on the diver as a result of gravity. This

**is the weight of the diver and this force is given by the equation F=mg where g is the gravitational field strength and m is the mass.**

*force*