Chapter 4

Question 1

an objects change in position relative to a reference point

Answer 1

motion

Question 2

the distance traveled divided by the time interval during which the motion occured

Answer 2

speed

Question 3

the speed of an object in a particular direction

Answer 3

velocity

Question 4

the rate at which velocity changes over time; an object accelerates, if its speed, direction, or both change

Answer 4

acceleration

Question 5

a push or pull exerted on an object in order to change the motion of the object; force has size and direction

Answer 5

force

Question 6

the SI unit of force (symbol N)

Answer 6

Newton

Question 7

the combination of all of the forces acting on an object

Answer 7

net force

Question 8

a force that opposes motion between two surfaces that are in contact

Answer 8

friction

Question 9

a force of attraction between objects that is due to their masses

Answer 9

gravity

Question 10

a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe

Answer 10

weight

Question 11

a measure of the amount of matter in an object

Answer 11

mass