9-3: Newton's Third Law

Front

What are the three Laws of Motion proposed by Newton?

Back

1. Newton's First Law: An object at rest stays at rest, and an object in motion stays in motion unless acted upon by a net external force. 2. Newton's Second Law: The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass (F=ma). 3. Newton's Third Law: For every action, there is an equal and opposite reaction.

Front

What does Newton's Third Law state?

Back

For every action, there is an equal and opposite reaction.

Front

Can you exert a force on an object without it exerting a force back on you?

Back

No, according to Newton's Third Law, you cannot exert a force on anything unless it also exerts a force on you.

Front

If you sit in a chair, what forces are acting on you?

Back

When you sit in a chair, both the force of gravity acting downwards and the normal force from the chair acting upwards are present.

Front

What happens when one object exerts a force on another object?

Back

The second object exerts a force of the same magnitude but in the opposite direction to that of the first object.

Front

Is it true that forces always come in pairs?

Back

Yes, according to Newton's Third Law, forces always come in pairs.

Front

What is an example of Newton's Third Law in everyday life?

Back

When you jump off a small boat, you push the boat backward as you move forward.

Front

What is the relationship between action and reaction forces?

Back

Action and reaction forces are equal in size but opposite in direction.

Front

How does Newton's Third Law apply to walking?

Back

When you walk, your foot pushes backward against the ground, and the ground pushes your foot forward with an equal and opposite force.

Front

What is the significance of Newton's Third Law in sports?

Back

In sports, understanding action-reaction pairs can help athletes optimize their movements, such as in jumping or throwing.