Understanding Newton's Third Law of Motion

What is the fundamental principle of Newton's Third Law of Motion?

• The force of gravity acts between all masses.

• An object in motion stays in motion unless acted upon by an external force.

• Energy cannot be created or destroyed.

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

When a cannonball is fired, why is the cannon's backward movement less noticeable?

• The cannon is fixed to the ground.

• The cannonball moves faster than the cannon.

• The cannon is much heavier than the cannonball.

• The cannon is lighter than the cannonball.

How does Newton's Third Law help birds to fly?

• Birds use the wind to glide.

• Birds push the air forward, and the air pushes them backward.

• Birds exert a downward force on the air, and the air pushes them upward.

• Birds flap their wings to create lift.

In swimming, how does Newton's Third Law enable forward movement?

• The swimmer floats due to buoyancy.

• The swimmer pushes the water backward, and the water pushes them forward.

• The swimmer pulls the water forward, and the water pulls them backward.

• The swimmer kicks the water downward, and the water pushes them upward.

Why doesn't the Earth move when a bike exerts force on it?

• The Earth's mass is too large compared to the bike.

• The bike's tires absorb the force.

• The bike's force is too weak.

• The Earth is fixed in space.