3.9-Understanding Newton's Laws of Motion

What does Newton's first law of motion state?

• The force acting on an object is equal to the mass of the object multiplied by its acceleration.

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

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

• The acceleration of an object is proportional to the force acting upon it and inversely proportional to its mass.

Which law is also known as the law of inertia?

• The law of universal gravitation

• Newton's third law of motion

• Newton's second law of motion

• Newton's first law of motion

According to Newton's second law of motion, what variables determine the force produced?

• Velocity and acceleration

• Mass and acceleration

• Force and mass

• Mass and velocity

What is the common name for Newton's third law of motion?

• Law of acceleration

• Law of equal forces

• Law of inertia

• Law of action and reaction

What happens according to Newton's third law when a force is exerted?

• An equal and opposite force is exerted back.

• The object's acceleration decreases.

• The object's mass increases.

• The object moves at constant velocity.

How is acceleration described in Newton's second law of motion?

• Constant regardless of force.

• Directly proportional to velocity.

• Inversely proportional to mass and proportional to force.

• Proportional to mass and inversely proportional to force.

What example is given to explain Newton's first law in a sports context?

• A tennis racquet hitting a basketball.

• A soccer ball continuing in motion unless acted upon by an external force.

• A golf ball being driven by a club.

• A high jumper applying force to the ground.

What is the formula expressed in Newton's second law of motion?

• F = m * a

• F = m + a

• F = m / a

• F = m - a

Which of the following is an example of Newton's third law?

• A ball rolling down a hill due to gravity.

• A leaf falling from a tree.

• A car accelerating when the gas pedal is pressed.

• A high jumper pushing off the ground and the ground pushing back.

What does Newton's first law imply about the motion of objects on Earth?

• Objects increase in mass when moving.

• Objects will eventually slow down or change direction due to external forces like friction.

• Objects will continue moving indefinitely at the same speed and direction.

• Objects in motion do not experience any forces.