book 2. chapter 1

Question 1

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

Answer 1

gravity

Question 2

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

Answer 2

weight

Question 3

a measure of the amount of matter in an object

Answer 3

mass

Question 4

an object’s change in position relative to a reference point

Answer 4

motion

Question 5

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

Answer 5

speed

Question 6

the speed of an object in a particular direction

Answer 6

velocity

Question 7

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

Answer 7

acceleration

Question 8

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

Answer 8

force

Question 9

the SI unit for force

Answer 9

newton

Question 10

the combination of all of the forces acting on an object

Answer 10

net force

Question 11

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

Answer 11

friction