Physics Ch 3.1 Pushes and Pulls

Question 1

What causes motion? What is the definition of that answer?

Answer 1

Forces cause motion. A force is that which changes or tends to change an objects state of rest or uniform motíon in a straight line.

Question 2

What are the characteristic effects of forces

Answer 2

• Forces can change the shape or size of an object
• Forces can alter the speed of an object. That is, it can make things go faster or slower
• Forces can change the direction of moving objects

Question 3

What are the types of forces?

Answer 3

NON - CONTACT
- gravity, magnetic, electromagnetic
CONTACT
- friction, tension

Question 4

Explain gravity.

Answer 4

This is a type of non contact force. It is the force which pulls us towards the centre of the Earth.
Weight is the pull of gravity acting on an object. Weight changes as gravity changes.

Question 4

Explain non contact forces

Answer 4

These forces can act over large surfaces of air or empty space without two objects touching.

Question 5

What is the difference between the gravity on the moon and earth?

Answer 5

The moon has less gravity than that of Earth’s gravity. The moon’s gravity is 1/6th than that of Earth’s gravity. An astronaut will weigh six times more on Earth than on the moon.

Question 6

What is “weightless”?

Answer 6

Weightless mean there is no pull of gravity