Page 99 - text book form physics kssm 2020

Chapter 3
Gravitation
Mass of the Earth and the Sun
Formula for the mass of the Earth and the Sun can be derived by using the formula of Newton’s
Universal Law of Gravitation and the formula for centripetal force.

Activity 3.10 Algorithms CPS

Aim: To determine the mass of the Earth and the Sun
SMART
Instructions: SMART INFO
1. Observe Figure 3.20.
2. Figure 3.20 shows the orbit of the Moon around the Earth. Circumference of a circle
with radius r, is 2πr.

Orbit of the Moon v

Earth
Moon
r
m

M

Figure 3.20

M = mass of the Earth
m = mass of the Moon
r = radius of the Moon’s orbit
T = period of revolution of the
Moon around the Earth
v = linear speed of the Moon

3. Discuss and complete the boxes below.

Distance travelled by the Moon when making =
one complete orbit around the Earth

Distance
Linear speed of the Moon, v =
Time

v =

93
3.1.6
3.1.6 93