Newton's Laws and Friction

What is Newton's First Law of Motion?

• An object at rest will start moving, and an object in motion will change its direction, unless acted upon by an external force.

• An object at rest will stay at rest, and an object in motion will stop immediately, unless acted upon by an external force.

• An object at rest will stay at rest, and an object in motion will stay in motion with a different speed and in a different direction, unless acted upon by an external force.

• An object at rest will stay at rest, and an object in motion will stay in motion with the same speed and in the same direction, unless acted upon by an external force.

According to Newton's Second Law of Motion, what is the relationship between force, mass, and acceleration?

• Force is directly proportional to mass and acceleration.

• Force is inversely proportional to mass and acceleration.

• Force is directly proportional to mass but not acceleration.

• Force is directly proportional to acceleration but not mass.

What is Newton's Third Law of Motion?

• Every action has a greater reaction.

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

• For every action, there is a smaller and opposite reaction.

• Newton's Third Law of Motion states that there is no reaction to an action.

What are the two types of friction?

• static friction and kinetic friction

• magnetic friction and gravitational friction

• thermal friction and electrical friction

• rolling friction and fluid friction

Which type of friction occurs when an object moves through a fluid, such as air or water?

• Surface friction

• Fluid friction

• Static friction

• Rolling friction

Which type of friction occurs when two solid surfaces slide against each other?

• kinetic friction

• fluid friction

• rolling friction

• static friction

True or False: According to Newton's First Law, an object at rest will remain at rest unless acted upon by an external force.

• An object at rest will accelerate without any external force

• An object at rest will move on its own

• True

• False

True or False: According to Newton's Second Law, the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass.

• True

• False

• Partially true

• Not applicable

True or False: According to Newton's Third Law, for every action, there is an equal and opposite reaction.

• False

• Sometimes true, sometimes false

• There is no reaction

• True

True or False: Friction always opposes the motion of an object.

• Friction has no effect on motion

• False

• Friction can sometimes assist the motion of an object

• True