Lesson 1: Newton's 1st Law

Front

What are unbalanced forces?

Back

Forces acting on an object that cause the object to accelerate.

Front

What are balanced forces?

Back

Forces that are equal in size but opposite in direction.

Front

What happens if a net force acts on an object?

Back

The object may change speed, change direction, or do neither.

Front

In which direction does friction act?

Back

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

Front

What is net force?

Back

The overall force acting on an object after all the forces are combined.

Front

What is inertia?

Back

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.

Front

What is the relationship between force and acceleration?

Back

According to Newton's 2nd Law, force equals mass times acceleration (F=ma).

Front

What is an example of unbalanced forces?

Back

A soccer ball being kicked, where the force of the kick is greater than the friction.

Front

What is an example of balanced forces?

Back

A book resting on a table, where the weight of the book is balanced by the normal force of the table.