Newton's Laws

Question 1

Weight (Fg)

Answer 1

• gravitational force the Earth exerts on an object on or near its surface

Question 2

Normal force (FN)

Answer 2

• the perpendicular force exerted by a surface on an object in contact with it

Question 3

Frictional force (Ff)

Answer 3

• the force that opposed the motion of an object and acts parallel to the surface with which the object is in contact with

Question 4

newton’s first

Answer 4

• an object continues in a state of rest or uniform (moving with constant) velocity unless it is acted upon by a net or resultant force

Question 5

inertia

Answer 5

• the property of an object that causes it to resist a change in its state of rest or uniform motion

Question 6

newton’s second

Answer 6

• when a net force, Fnet, is applied to an object of mass, m, it accelerates in the direction of the net force. The acceleration, a, is directly proportional to the net force and inversely proportional to the mass

Question 7

newton’s third

Answer 7

• when an object A exerts a force on object B, object B simultaneously exerts an oppositely directed force of equal magnitude on object A

Question 8

force

Answer 8

• a vector quantity

Question 9

gravitational force

Answer 9

• the force Earth exerts on an object on the surface or near its surface. When the object is at rest, it is referred to as weight.

Question 10

mass vs. weight

Answer 10

• matter vs. attraction
• scalar vs. vector
• constant vs. changing

Question 11

static friction (Us) 
rubber on dry concrete
rubber on wet concrete
shoes on wood
shoes on ice
bone lubricated by synovial fluid

Answer 11

• 1.0
• 0.7
• 0.9
• 0.1
• 0.016