Page 181 - Physics

Linear motion

2. Constant negative slope Acti vity 8.3
A constant negative slope represents
uniform acceleration in the reverse Aim: Creating a velocity-time
direction. The object is slowing down graph
(Figure 8.13) as time increases.
Materials Stopwatch and long stretch
of track

70 Procedure
1. Set up a long track and mark it at
60 regular intervals.
Velocity (m/s) 50 2. Allow a cart or object to roll down

the track.
40
3. Use a stopwatch to measure the
30
time it takes for the cart to travel
20
between each pair of markings.
10
4. Calculate the velocity for each
interval and plot a velocity-time
0 1 2 3 4 5 6 7
Time (s) graph.
Interpreting Velocity-Time Graphs
Figure 8.13: Graph for a body moving with
constant negative slope

3. Horizontal line 30
A horizontal line signifi es constant
velocity, where the object’s speed remains Speed (m/s) 20
the same as shown in Figure 8.14. 10
A B C D

0 1 2 Time (s) 4 5
3
Velocity (m/s) 60 Figure 8.15
80

40 1. Determine the acceleration of
the object using the slope of the
velocity-time graph.
20
2. Identify the time intervals when
the object experiences positive,
0 1 2 3 4 5
Time (s) negative, and zero acceleration.
Figure 8.14: Graph for a body moving with 3. Calculate the total distance
constant uniform velocity covered by the object during
specifi c time intervals.

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Physics Form 1 Final.indd 175 16/10/2024 20:58