P1 Motion

Question 1

what is a scalar?

Answer 1

magnitude

Question 2

what is a vector?

Answer 2

magnitude + direction

Question 3

examples of scalar?

Answer 3

distance, speed, time

Question 4

examples of vector?

Answer 4

displacement, velocity, acceleration, force

Question 5

how do you calculate speed?

Answer 5

distance/time

Question 6

how do you calculate average speed?

Answer 6

total distance/total time taken

Question 7

how do you calculate acceleration?

Answer 7

∆v/∆t
= (v-u)/t

Question 8

how do you calculate change in velocity?

Answer 8

∆v
= final - initial
= v-u

Question 9

dropping objects have … acceleration

Answer 9

constant acceleration (g = 9.81)

Question 10

how do you get velocity from a d-t graph?

Answer 10

gradient

Question 11

d-t graph:
what does a horizontal line represent?

Answer 11

stationary

Question 12

d-t graph:
what does a straight slope represent?

Answer 12

constant speed

Question 13

d-t graph:
what does a curved slope represent?

Answer 13

increasing gradient - acceleration
decreasing gradient - deceleration

Question 14

v-t graph:
what do horizontal lines represent?

Answer 14

on x-aixs - stationary
above x-axis - constant speed

Question 15

v-t graph:
what does a up straight line represent?

Answer 15

constant acceleration

Question 16

v-t graph:
what does a down straight line represent?

Answer 16

constant deceleration

Question 17

v-t graph:
what does a curved line represent?

Answer 17

increasing gradient - increasing acceleration/deceleration
decreasing gradient - decreasing acceleration/deceleration

Question 18

how do you get the distance travelled from a speed-time graph?

Answer 18

area under the line

Question 19

how do you get the acceleration from a speed-time graph?

Answer 19

gradient

Question 20

how do you get displacement from a v-t graph?

Answer 20

area between the line and the x-axis
•area below x-axis is (-)
•area above x-axis is (+)

Question 21

how do you get distance from a v-t graph?

Answer 21

modulus total area between the line and the x-axis

Question 22

define distance

Answer 22

scalar, total length of the path between 2 points

Question 23

define displacement

Answer 23

vector, the shortest path between two points.

Question 24

define velocity

Answer 24

speed in a given direction → s/t

Question 25

define acceleration

Answer 25

rate of change of velocity → ∆v / ∆t

Question 26

what is terminal velocity?

Answer 26

maximum velocity of an object as it falls through a fluid (eg. air)