Ch. 2 & 3 Vocab Terms

Question 1

occurs when an object changes in position

Answer 1

motion

Question 2

speed of an object with direction

Answer 2

velocity

Question 3

distance and direction of an objects final position from its initial position

Answer 3

displacement

Question 4

speed

Answer 4

the distance and object travels per unit of time

Question 5

total distance an object moves over total time

Answer 5

average speed

Question 6

speed at a single instance of time

Answer 6

instantaneous speed

Question 7

speed at a single instance of time

Answer 7

instantaneous speed

Question 8

property of a moving object that depends on the object’s mass and velocity

Answer 8

momentum

Question 9

acceleration

Answer 9

change of velocity of an object over time

Question 10

any object moving through the air

Answer 10

projectile

Question 11

force

Answer 11

any push or pull on an object

Question 12

forces that are equal in size but opposite in direction and do not cause a change in motion

Answer 12

balanced force

Question 13

forces that are not equal in size, not opposite in direction and do cause a change in motion

Answer 13

unbalanced force

Question 14

the sum of all forces acting on an object

Answer 14

net force

Question 15

friction

Answer 15

force that opposes the motion between 2 surfaces in contact

Question 16

is an attractive force between any 2 objects that depends on the mass of the objects and distance between them

Answer 16

gravity

Question 17

freefall

Answer 17

when an object falls due to gravity free air resistance

Question 18

weight

Answer 18

measurement of gravitational force exerted on an objects mass

Question 19

amount of matter in an object

Answer 19

mass

Question 20

inertia

Answer 20

tendency of an object to resist any change in motion

Question 21

centripetal force

Answer 21

force that causes an object to move in a curved path

Question 22

force that opposes the motion of objects moving through air

Answer 22

air resistence

Question 23

highest velocity an object will reach as the object falls due to gravity

Answer 23

terminal velocity

Question 24

g is

Answer 24

universal gravatational constant
on earth its always 9.8 m/s²

Question 25

microwelds

Answer 25

are created when tiny ridges and bumps on surfaces come in contact

Question 26

physical science

Answer 26

study of matter and energy