Read About It: Newton's First Law of Motion

What is the main principle behind the trick of yanking a tablecloth away quickly without disturbing the objects on the table?

• Inertia of the objects

• Friction with the table

• Gravity acting on the objects

• Balanced forces

According to Newton's First Law of Motion, what happens to a body at rest if no unbalanced force acts on it?

• It stays at rest

• It starts moving

• It accelerates

• It changes direction

What is required to change the motion of an object already in motion?

• An unbalanced force

• A balanced force

• Inertia

• Gravity

Why does a piano eventually stop moving after being pushed across a stage?

• Friction with the floor

• Inertia

• Gravity

• Balanced forces

What happens when you apply a force to a tennis ball that is greater than the force of gravity?

• The ball flies upward

• The ball stays in place

• The ball moves downward

• The ball changes direction

What is the result of balanced forces acting on an object?

• The object does not move

• The object accelerates

• The object changes direction

• The object increases speed

In the context of forces, what does the term 'magnitude' refer to?

• Size or importance of a force

• Direction of a force

• Type of force

• Duration of a force