Understanding Newton's Third Law

What prevents a person from falling when they lean on a desk?

• The desk exerts an equal and opposite force.

• The desk is made of a special material.

• Gravity is weaker near the desk.

• The person is holding onto the desk.

How does a balloon accelerate when air is expelled from it?

• The expelled air creates a vacuum.

• The expelled air exerts a force on the balloon.

• The balloon becomes lighter.

• The air inside the balloon heats up.

What role does the expulsion of gas play in the spinning of a plastic bottle?

• It reduces the weight of the bottle.

• It creates a vacuum inside the bottle.

• It generates a reaction force that spins the bottle.

• It cools down the bottle.

In the fire extinguisher experiment, what causes the person to accelerate?

• The skateboard provides additional force.

• The gas pushes back on the cylinder and the person.

• The fire extinguisher is lightweight.

• The reduction valve increases pressure.

What is the main principle demonstrated by the liquid nitrogen experiment?

• The cooling effect of liquid nitrogen.

• The transformation of liquid to gas.

• The creation of a mini explosion.

• The application of Newton's Third Law.