Newton's Third Law of Motion Quiz

What causes a bird to fly?

• The bird flaps its wings rapidly

• The bird pushes the air downward

• The air pushes the bird downward

• The shape of its wings deflects air downward

Which action-reaction pair causes an airplane to move upward?

• The engine pushes air backward and the air pushes the wings upward

• The wings deflect air downward and the air pushes the wings upward

• The engine pushes air backward and the air pushes the plane forward

• The wings deflect air downward and the air pushes the plane forward

Why don't action and reaction forces cancel to zero?

• Because the forces are internal to the system being considered

• Because the forces are equal in strength

• Because the forces are external to the system being considered

• Because the forces act on different objects

Do the interatomic forces that hold a baseball together play a role in accelerating the ball?

• False

• True

If the action-reaction forces are internal to a system, do the forces cancel and the system does not accelerate?

• False

• True

Why does a ball accelerate even though the forces exerted on it are equal and opposite?

• Because the forces are external to the system being considered

• Because the forces are internal to the system being considered

• Because the forces are equal in strength

• Because the forces act on different objects

From which points of view can the horse-cart problem be considered?

• The farmer, the horse, and the horse and cart together

• Only the horse and cart together

• Only the farmer

• Only the horse

According to the farmer, what will produce acceleration in the cart?

• The mass of the cart divided by the net force on the cart

• The net force on the cart divided by the mass of the cart

• The mass of the cart divided by the acceleration of the cart

• The acceleration of the cart divided by the mass of the cart

Which interaction is responsible for moving the horse-cart system?

• The interaction between the horse and cart

• The interaction between the horse and the ground

• The interaction between the horse and the farmer

• The interaction between the cart and the ground

What is the role of friction in the acceleration of a car?

• Friction between the tires and the road surface hinders the car's acceleration

• Friction between the tires and the road surface has no effect on the car's acceleration

• Friction between the tires and the road surface helps the car to accelerate

• Friction between the car's engine parts is the only factor in acceleration