force

What does Newton’s First Law of Motion state?

• An object will remain at rest or in uniform motion unless acted upon by an external force.
• An object will accelerate indefinitely without any force.
• An object will only move if a force is applied continuously.
• An object will change direction only when a force is applied.

Which of the following is an example of Newton’s First Law?

• A ball thrown upwards eventually falls back down due to gravity.
• A car accelerating on a flat road without any friction.
• A hockey puck sliding on ice continues to move until a force acts on it.
• A person pushing a stationary box that starts to move immediately.

What is Newton’s Second Law of Motion?

• The acceleration of an object is constant regardless of the net force applied.
• The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
• The force acting on an object is equal to its mass times its velocity.
• An object in motion will stay in motion unless acted upon by an equal force.

If you push a lighter cart and a heavier cart with the same force, what will happen?

• The lighter cart will accelerate more and move faster than the heavier cart.
• The lighter cart will not move at all while the heavier cart moves faster.
• Both carts will accelerate at the same rate and move together.
• The heavier cart will accelerate more and move faster than the lighter cart.

A soccer ball is at rest until a player kicks it. This demonstrates

• Newton's First Law of Motion
• Law of Conservation of Energy
• Newton's Third Law of Motion
• Newton's Second Law of Motion

What happens when you apply more force to an object with the same mass?

• The object remains stationary.
• The object loses mass.
• The object accelerates more.
• The object moves in the opposite direction.

A swimmer pushes against the water and moves forward. Which law does this demonstrate?

• Newton's Third Law of Motion
• Law of Conservation of Energy
• Newton's Second Law of Motion
• Newton's First Law of Motion

Which of these best describes Newton’s Third Law?

• For every action, there is a proportional reaction.
• Every action has no effect on the opposite direction.
• An object at rest will remain at rest unless acted upon by a force.
• For every action, there is an equal and opposite reaction.

A bird flaps its wings downward, and it moves upward. What law is this?

• Newton's First Law of Motion
• Newton's Second Law of Motion
• Newton's Third Law of Motion
• Law of Conservation of Energy

What happens to an object’s acceleration if you double the force applied to it?

• The acceleration quadruples.
• The acceleration decreases by half.
• The acceleration doubles.
• The acceleration remains the same.