P2.1 Motion

Question 1

Acceleration

Answer 1

Change in velocity / change in time
Force / mass
Measured in m/s²
IF SPEED AND/OR DIRECTION OF MOTION CHANGE, THE BODY IS ACCELERATING

Question 2

Average speed

Answer 2

Total distance / total time
Measured in m/s

Question 3

Eisplacement

Answer 3

Distance from a point in a particular direction

Question 4

Gradient

Answer 4

Degree of steepness of a graph at any point (slope)
Change in y / change in x
y2 - y1 / x2 - x1

Question 5

Kinetic energy

Answer 5

Energy associated with a kinetic store
KE=1/2mv²

KE = work
(Work = force x displacement)

Question 6

Kinetic store

Answer 6

Energy in a kinetic store is associated with a moving object
KE = 1/2mv²

Question 7

Scalar

Answer 7

Quantity that has magnitude (size) but no direction

Question 8

Vector

Answer 8

Quantity that has direction as well as a magnitude (size)

Question 9

Velocity

Answer 9

Speed in a particular direction
Vector quantity

Question 10

Speed

Answer 10

Speed = distance / time
Scalar quantity

Question 11

Uniform speed

Answer 11

Speed stays constant for the whole journey
Speed calculated from distance and time is a single value

Question 12

Non uniform speed

Answer 12

Speed changes and is not the same during the journey
Speed calculated from (total) distance and (total) time is the average speed

Question 13

How many metres in a mile

Answer 13

1609 meters

Question 14

How many seconds in an hour

Answer 14

3600 seconds

Question 15

Vectors vs Scalars

Answer 15

SCALARS ONLY HAVE MAGNITUDE

VECTORS HAVE BOTH A MAGNITUDE AND A DIRECTION

Question 16

Speed vs Velocity

Answer 16

SPEED HAS ONLY MAGNITUDE
VELOCITY HAS BOTH MAGNITUDE AND DIRECTION

Question 17

Distance vs Displacement

Answer 17

DISTANCE
Length of path travelled from A to B (size only = scalar)

DISPLACEMENT
Length of the shortest distance between 2 points
(size and direction = vector)

Question 18

Why temperature is scalar

Answer 18

Temperature only has a size, no direction

Question 19

Adding Vectors

Answer 19

If vectors act in the same direction, you add them
If vectors act in opposite directions, you subtract them

You can only add/subtract vectors that either…
… act up and down
OR
… act left and right

Question 20

How to calculate relative velocity of body A to body B?

Answer 20

Difference between the velocities

Question 21

Calculate speed on a distant time graph

Answer 21

Gradient of a line on a distance-time graph = speed

Question 22

Displacement-Time Graphs

Answer 22

Displacement-time graph shows how displacement of an object changes with time
Gradient of a displacement time graph = velocity (not speed)
Gradient of a displacement time graph can be zero, positive or negative (unlike distance-time graph)
Negative gradient would represent a negative velocity (so indicates a reverse in direction)

Question 23

Calculate acceleration from a velocity time graph

Answer 23

Gradient of a line on a velocity time graph = acceleration

Question 24

Calculate displacement or distance from a velocity time or speed time graph

Answer 24

Area under graph line

Question 25

SUVAT equation without any “s”

Answer 25

v=u+at

(Mnemonic: View Ugly AND Amazing Teapots)

Question 26

SUVAT equation without any “a”

Answer 26

2s= (u+v) x t

(Mnemonic: TO See Us AND View Teapots)

Question 27

SUVAT equation without any “v”

Answer 27

s=ut+(1/2)at²

(Mnemonic: See Ugly Teapots And HAVE A Tea TOO)

Question 28

SUVAT equation without any “t”

Answer 28

v² - u² = 2as

(Default SUVAT equation)