Forces, moments and momentum

Question 1

What is a force?

Answer 1

It is either a push or a pull and we can use the formula

F = m*a to calculate

Question 2

What can a force do to an object?

Answer 2

It can change the direction an object is moving in
It can change an objects size
It can change an objects shape
It can change an objects speed

Question 3

What are balanced and unbalanced forces

Answer 3

Balanced forces are when 2 or more forces acting on an object are equal meaning there is no resultant force and the object doesn’t move
Unbalanced forces are when 2 or more forces acting on ab object in any direction are unequal meaning the object moves in the direction with more net force (resultant force)

Question 4

What is Newtons first law of motion?

Answer 4

An object at rest will continue to be at rest unless an external unbalanced force acts on it
And an object in motion will continue to move at constant speed unless a net force acts upon it.

Question 5

What is inertia?

Answer 5

The resistance of an object to change velocity

Question 6

Using inertia explain why seatbelts are important?

Answer 6

Passengers move at the same speed as the car but when there is a sudden brake or stop the passengers bodies resist the change in velocity and continue moving forward a bit before stopping.