7.1 Speed and velocity

Question 1

displacement

Answer 1

distance in a given direction.

Question 2

speed

Answer 2

change of distance per unit of time

Question 3

velocity

Answer 3

change of displacement per unit time

velocity is the speed in a given direction

Question 4

speed =

Answer 4

v = s/t

Question 5

distance travelled =

Answer 5

s= vt

Question 6

object moving at a constant speed on a circle

Answer 6

v= 2piR/t

t is the time moved around once

2pi r is the circumference of the circle

Question 7

average speed

Answer 7

change in distance / change in time

Question 8

what does a distance time graph look like when an object is travelling at constant speed

Answer 8

straight line with constant gradient

Question 9

gradient of distance time graph =

Answer 9

speed of the object

Question 10

how do you measure gradient of an object at changing speed

Answer 10

draw a tangent

Question 11

what does it mean when something travels at a constant velocity

Answer 11

moves at the same speed without changing direction

Question 12

when does velocity change

Answer 12

if the object changes direction