Professor Dave Explains: Newton's Laws of Motion Quiz

What is Newton's third law of motion most famously stated as?

• For every action there is an unequal and opposite reaction.

• For every action there is no reaction.

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

• For every action there is a random reaction.

According to Newton's third law, what happens when two objects interact?

• The forces they impart on each other will be unequal in magnitude and same in direction.

• The forces they impart on each other will be unequal in magnitude and opposite in direction.

• The forces they impart on each other will be equal in magnitude and opposite in direction.

• The forces they impart on each other will be equal in magnitude and same in direction.

What is the force that points straight up with the same magnitude as the force of gravity pulling you down?

• Normal force

• Frictional force

• Tension force

• Applied force

Why can an object move even though any force accelerating it must be paired with another in the opposite direction?

• Because the forces acting upon the object are considered, not the forces that it applies on other objects.

• Because the forces acting upon the object are not considered, only the forces that it applies on other objects.

• Because the forces acting upon the object are not paired with another in the opposite direction.

• Because the forces acting upon the object are always in the same direction.

When hammering a nail into a piece of wood, what force drives the nail into the wood?

• Net force acting upon the hammer from the motion of the wood

• Net force acting upon the nail from the motion of the wood

• Net force acting upon the hammer from the motion of the nail

• Net force acting upon the nail from the motion of the hammer

When a rock falls to the ground, what causes the object to accelerate towards the Earth?

• Gravitational force from the earth

• Gravitational force from the stars

• Gravitational force from the moon

• Gravitational force from the sun

Why don't we notice the earth's acceleration towards a falling rock in everyday experience?

• The acceleration of each object is the same regardless of its mass.

• The acceleration of each object is directly proportional to its mass.

• The acceleration of each object is not related to its mass.

• The acceleration of each object is inversely proportional to its mass.

What is the equation for Newton's second law of motion?

• F = ma

• F = mv

• F = m

• F = a

What is the force that brings a car to a quick stop when it hits a brick wall?

• Tension force from the brakes

• Reaction force from the wall

• Applied force from the engine

• Frictional force from the road

What is the context in which Newton's third law is best understood?

• When assessing the motion of an object by considering only the forces that it applies on other objects.

• When assessing the motion of an object by considering only the forces acting upon that object and not the forces that it applies on other objects.

• When assessing the motion of an object by considering the forces that it applies on other objects.

• When assessing the motion of an object by considering only the forces acting upon that object and the forces that it applies on other objects.