motion of the planets

• Science
• Secondary Education

Motion of the planets

Grade -9

Science

may 17, 2020

What did you see in the video?

Objectives 

1. Differentiate between rotation and revolution of planets

2. discuss the planetary orbits and speeds

CHALLENGE 

What causes planets to orbit the Sun?

ROTATION 

The time planets take to complete one rotation is its period of rotation 

REVOLUTION 

The time taken by the object to travel once around the sun is its period of revolution 

Do you think all planets have same period of rotation and revolution?

Interpret

Which planet do you think will move faster? (on the right or left)

What is Earth's one year travel around the Sun called?

1. period of revolution
2. period of rotation
3. the four seasons
4. gravitational pull

This figure shows the effects of the gravitational pull of the Sun on planets. What is represented by the red arrow?

1. the orbit of the planet around the Sun
2. the path a planet would float into space if there were no gravitational pull
3. the rotation of the planet
4. the path of light from the Sun

What does the rotation of Earth cause?

1. Change in color
2. change in speed
3. change in day and night
4. change in seasons

Which of the picture shows a correct arrangement of solars ystem?

1. a
2. b
3. c
4. d

Name any two words learnt today