Contents are appropriate for IGCSE Physics

2. Revision
1. Define:
1. Distance
2. Displacement
3. Speed
4. Velocity
5. Acceleration
6. Deceleration
2. List the equations of motion

3. Distance – time graph
On a distance time graph, distance is on the y-axis and
time on the x-axis
The gradient of a distance-time graph is numerically
equal to the speed.
p.28 comp. phy

4. Speed – time graph
Speed is on the y-axis and time on the x-axis.
The gradient is numerically equal to the acceleration.
The area under the graph is equal to the distance
covered.
p.29 comp. phy.

5. Graphs of acceleration p.34

6. Free fall
When a stone and a feather are dropped from the same
height, the stone reaches the ground first. This is
because of air resistance.
However, when there is no air resistance, the stone and
the feather hit the ground at the same time. The stone
and feather have the same acceleration.
This acceleration is called acceleration due to
gravity (g).

7. LOCATION ACCELERATION DUE TO GRAVITY
Earth 9.8m/s2
Mars 3.7m/s2
The Moon 1.6m/s2
Venus 9.5m/s2
Jupiter 24.5m/s2
The Sun 275m/s2

8. Qns.

9. Terminal Velocity
When an object is falling freely, it accelerates. Its speed
increases as well.
Considering air resistance the object will reach a point
when it stops accelerating. Its speed remains constant.
This constant speed is called Terminal Velocity.
Terminal velocity is defined as: a constant speed that
a free falling object acquires when air resistance
is equal to the weight of the object.
Draw diagram*