Motion

Question 1

Define speed

Answer 1

Measure of how much distance is travelled in a set amount of time. Speed= distance/time

Question 2

Define velocity

Answer 2

A measure of speed with a direction- e.g. of a vector.

Question 3

Formula to find distance

Answer 3

distance= time X speed

Question 4

Formula to find time

Answer 4

time= distance/speed

Question 5

1 kilojoules (KJ)= ? J

Answer 5

1000 joules (J)

Question 6

Prefix table

Answer 6

centi (c)= 1/100
milli (m)= 1/1000
kilo (k)= X 1000
mega (M)= X 1000000
giga (G)= X 1000000000

Question 7

Name the device used to measure very small distances

Answer 7

Micrometer screw gauge

Question 8

Name the standard units for speed, distance and time

Answer 8

speed= m/s
distance= meters (m)
time= seconds (s)

Question 9

If you walk 50m front and then 100m backwards, what is your -
1. total displacement?
2. total distance?

Answer 9

displacement= 50m front= +50
100m back= -100
= +50-100= -50m

Distance= 50+100= 150m

Question 10

formula for average speed and velocity

Answer 10

avg. speed= total distance/total time (in any direction)

avg. velocity= total distance/total time (in any direction)

Question 11

Define acceleration

Answer 11

Acceleration is when the speed of an object increases.
How quickly the speed changes in a given time.

Question 12

Define deceleration

Answer 12

When the speed of an object decreases

Question 13

Formula for acceleration

Answer 13

acceleration= change in velocity/time taken

Question 14

Rocket orange takes 4 seconds to go from 0-12m/s and rocket pink takes 2 seconds to go from 0-8m/s. Which rocket accelerates faster?

Answer 14

Rocket orange= a=v/t
= 12-0/4= 12/4= 3m/s
Rocket pink= a=v/t
= 8-0/2= 8/2= 4m/s
Hence, rocket pink accelerates faster.