Definitions

Question 1

kinematics

Answer 1

describes the study of how objects move

Question 2

motion

Answer 2

a change in the location of an object as measured by an observer

Question 3

distance

Answer 3

total length of the path travelled by an object in motion

Question 4

displacement

Answer 4

the change in an object’s position over time

Question 5

scalar quantities

Answer 5

-tells us the magnitude (size)

e.g.
distance (5km)
time (7 s)
speed (8m/s)

Question 6

vector quantities

Answer 6

-tells us the magnitude (size) and direction

e.g.
position (5 km east)
velocity (3 m/s west)
displacement
acceleration

Question 7

instantaneous speed or instantaneous velocity

Answer 7

the exact values of each in that INSTANT

Question 8

uniform motion

Answer 8

when velocity is constant in a straight line

Question 9

any change in speed or direction results in

Answer 9

non-uniform motion

Question 10

non-uniform motion is equal to

Answer 10

accelerated motion

Question 11

acceleration is the ______ of velocity

Answer 11

rate of change

Question 12

an object that’s slowing down is ________ (2m/s2 N) or ________- (-2m/s N)

Answer 12

decelerating; accelerating

Question 13

force of gravity on Earth

Answer 13

9.8 m/s2 (down)

Question 14

what is the slope on a pt graph

Answer 14

velocity

Question 15

curved segment on a pt graph means

Answer 15

objects speed is changing

Question 16

flatline pt graph

Answer 16

stopped

Question 17

sloping up pt graph

Answer 17

constant speed away

Question 18

sloping down pt graph

Answer 18

constant speed back towards start

Question 19

curved line pt graph

Answer 19

changing speed –> accelerating

Question 20

area under a velocity time graph

Answer 20

gives the displacement of the object

Question 21

terminal velocity

Answer 21

the velocity of an object when the force due to air resistance equals the force due to gravity on the object

Question 22

average speed

Answer 22

the total distance travelled divided by the total time to travel that distance

Question 23

average velocity

Answer 23

the slope of a secant on a pt graph

Question 24

instantaneous velocity

Answer 24

the slope of the tangent to a position-time graph

Question 25

instantaneous speed

Answer 25

the magnitude of the slope of the tangent to a pt graph

Question 26

free fall

Answer 26

the motion of a falling object where the only force acting on the object is gravity

Question 27

projectile

Answer 27

an object that is launched through the air along a parabolic trajectory and accelerates due to gravity

Question 28

range ( ΔDx)

Answer 28

hor. displacement of a projectile

Question 29

projectile motion

Answer 29

the motion of a projectile such that the hor. component of the velocity is constant and the vertical motion has a constant acceleration due to gravity

Question 30

frame of reference

Answer 30

a coordinate system relative to which motion is described or observed

Question 31

relative velocity

Answer 31

the velocity of an object relative to a specific frame of reference

Question 32

force

Answer 32

push or a pull

Question 33

newton

Answer 33

the SI unit of force (N)

Question 34

contact force

Answer 34

a force that acts b/w 2 objects when they touch each other

Question 35

non-contact force

Answer 35

a force that acts b/w 2 objects w/o the objects touching

Question 36

non-contact force also known as ...

Answer 36

action at a distance force

Question 37

force of gravity

Answer 37

the force of attraction b/w all objects due to mass

Question 38

normal force

Answer 38

a force perpendicular to the surface b/w objects in contact

Question 39

tension

Answer 39

a force exerted by objects that can be stretched