Unit 3: Forces

What happened to the pieces of matter after the supernova explosion?

• They were pulled by gravity

• They were pushed by gravity

What is a nebula?

What's the direction of weight force?

• Away from the center of the Earth.

• Towards the center of the Earth.

What's the mass of a car with a weight of 20,000N?

Why does Jupiter have the greatest gravitational strength of all the planets?

Mass changes according to your location.

• Yes

• No

All planets orbit the Sun in .............................

• the same direction

• different direction

All planets except ......................... and ...................... spin on their axes in the same direction.

• Mercury

• Venus

• Earth

• Uranus

How do stars and planets form out of dust and gas?

Orbits of the planets are ................

• Circular

• squared

• almost circular