Year 9 Forces & motion revision

Front

What does Newton's First Law state about an object in motion?

Back

An object in motion will tend to stay in motion unless acted upon by an external force.

Front

What happens when the forces acting on an object are balanced?

Back

The object will either remain at rest or move at a constant velocity.

Front

How do you calculate acceleration?

Back

Acceleration = (Final Velocity - Initial Velocity) / Time.

Front

What does it mean for an object to have a constant velocity?

Back

It means the object is moving at the same speed and in the same direction.

Front

What is the formula for calculating frictional force?

Back

Frictional Force (F_f) = Coefficient of Friction (μ) x Normal Force (F_N).

Front

What is the coefficient of friction (μ)?

Back

It is a measure of how much frictional force exists between two surfaces.

Front

If a skydiver is moving at constant velocity, what can be said about the forces acting on them?

Back

The air resistance and weight are balanced.

Front

What is the acceleration of an object that changes its velocity from 5 m/s to 12 m/s in 2 seconds?

Back

3.5 m/s².

Front

According to Newton's First Law, what will an object at rest tend to do?

Back

An object at rest will tend to stay at rest unless acted upon by an external force.

Front

What is the relationship between force, mass, and acceleration?

Back

According to Newton's Second Law, Force = Mass x Acceleration (F = m x a).