11.1 Motion

Question 1

What is speed

Answer 1

The distance travelled by obj per unit time

Question 2

How do we calculate average speed

Answer 2

Distance
————
Time

*show working of converting km to m, min to s etc

Question 3

What can we draw to represent the motion of an object

Answer 3

Distance-time graph

Question 4

2 advantages of distance time graph

Answer 4

Find distance travelled at diff times easily
Can see if its moving longer/shorter distances w respect to diff lengths of time

Question 5

3 disadvantages of distance time graph

Answer 5

Hard to visualise motion
Hard to find whether its moving or not / fast or slow
Need to read graph in more details to find distance travelled

Question 6

What does distance-time graph show

Answer 6

Distance object travelled at different times

Question 7

When object is at rest, the graph is a ______ line

Answer 7

Horizontal

Question 8

The higher the speed, the ________ the slope

Answer 8

Steeper
(越快越斜）

Question 9

What is uniform motion

Answer 9

Constant speed in fixed direction
Eg escalator

Question 10

What is non-uniform motion

Answer 10

Changing speed or changing direction