Newton's Third Law and Resultant Force Quiz

Which statement best captures the essence of Newton's Third Law of Motion?

• A) An object at rest will stay at rest unless acted upon by an unbalanced force.
• B) For every action, there is an equal and opposite reaction.
• C) The acceleration of an object is directly proportional to the net force acting on it.
• D) The force of gravity acts equally on all objects regardless of mass.

In the context of a swimmer pushing off a pool wall, what is the reaction force?

• A) The wall pushes back on the swimmer with equal force.
• B) The swimmer moves forward through the water.
• C) The water moves away from the swimmer.
• D) The wall remains stationary.

When a rocket expels gas downwards, which statement accurately describes the forces involved?

• A) The rocket experiences a greater force than the expelled gas.
• B) The expelled gas creates a reaction force that propels the rocket upward.
• C) The upward force on the rocket is independent of the gas expelled.
• D) The rocket's motion is only due to the force of gravity.

If two ice skaters push off each other, how does their mass affect their speed post-push?

• A) Skater A will move faster than skater B.
• B) Skater B will move faster than skater A.
• C) Both skaters will move at the same speed.
• D) It cannot be determined without additional information.

In a tug-of-war where both teams exert equal force, what is the resultant force?

• A) There is a net force in the direction of the stronger team.
• B) The resultant force is zero, and the rope remains stationary.
• C) The rope will accelerate towards the weaker team.
• D) The teams will eventually tire and stop pulling.

What can be inferred about the resultant force when an object is in equilibrium?

• A) The resultant force is zero.
• B) The resultant force is equal to the weight of the object.
• C) The resultant force is equal to the applied force.
• D) The resultant force is always directed upwards.

How does Newton's Third Law apply to a bird flying through the air?

• A) The bird pushes the air down, and the air pushes the bird up.
• B) The bird has no effect on the air.
• C) The air pushes the bird down while the bird moves up.
• D) The bird and air interact with equal and opposite forces that cancel out.

Which scenario best illustrates the concept of resultant force in action?

• A) A car moving at a constant speed on a straight road.
• B) A ball rolling down a hill.
• C) A person standing still.
• D) A bicycle coasting to a stop.

If an object is subjected to three forces: 10 N east, 5 N west, and 3 N north, what is the resultant force?

• A) 5 N east.
• B) 8 N east.
• C) 3 N north.
• D) 8 N northeast.

What principle ensures that the total momentum before a collision equals the total momentum after?

• A) Newton's Second Law.
• B) Newton's Third Law.
• C) Conservation of momentum.
• D) Conservation of energy.