2. FORCE AND MOTION
2.1 ANALYSING LINEAR MOTION
Distance and displacement
1. Types of physical quantity:
i) Scalar quantity: ………………………………………………………………….
(ii) Vector quantity: …………………………………………………………………
2. The difference between distance and displacement:
(i) Distance: …………………………………………………………………………
(ii) Displacement: ……………………………………………………………………
3. Distance always longer than displacement.
4. Example: The following diagram shows the location of Johor Bahru and Desaru.
You can travel by car using existing road via Kota Tinggi, or travel by a small plane along straight path.
Calculate how far it is from Johor Bahru to Desaru if you traveled by:
a. The car
b. The plane

Solution:

Hands-on Activity 2.2 pg 10 of the practical book.
Idea of distance and displacement, speed and velocity.
Speed and velocity

1. Speed is ..…………………………………………………………………………………
2. Velocity is: ..……………………………………………………………………………...
3. Average of speed: ………………………………………………………………………

4. Average of velocity: ……………………………………………………………………...
5. Example:
An aeroplane flies from A to B, which is located 300 km east of A. Upon reaching B, the aeroplane then flies to C, which is located 400 km north. The total time of flight is 4 hours. Calculate
i. The speed of the aeroplane
ii. The velocity of the aeroplane

Solution:

Acceleration and deceleration
1. Study the phenomenon below;

Observation: ………………………………………………………………………………
2. Acceleration is,   ……………………………………………………………………….
Then, a =
3.   Example of acceleration;

Calculate the acceleration of car;
i) from A to B

ii) From B to C

4. Deceleration happens ...…………………………………………………………………
………………………………………………………………………………………………
5. Example of deceleration;
A lorry is moving at 30 m s-1, when suddenly the driver steps on the brakes and it stop 5 seconds later. Calculate the deceleration... [continues]

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