Lesson 1: Newton's 1st Law

Front

What is Newton's First Law of Motion?

Back

An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Front

What is an example of Newton's First Law of Motion?

Back

A skateboarder will continue to roll down a hill until a force stops them.

Front

What direction does friction act in relation to motion?

Back

Friction always acts in a direction opposite to the direction of motion.

Front

What type of forces cause a change in an object's motion?

Back

Unbalanced forces cause a change in an object's motion.

Front

What is the net force when multiple forces act on an object?

Back

The net force is the vector sum of all the forces acting on an object.

Front

If Lizzie pushes Alex on a scooter with 75N to the left and Alex helps with 20N to the left, what is the net force?

Back

95 N, to the left.

Front

What are balanced forces?

Back

Balanced forces are forces that are equal in size but opposite in direction, resulting in no change in motion.

Front

What happens to an object when unbalanced forces act on it?

Back

The object will accelerate in the direction of the net force.

Front

What is inertia?

Back

Inertia is the tendency of an object to resist changes in its state of motion.

Front

How does mass affect inertia?

Back

The greater the mass of an object, the greater its inertia.