Page 63 - text book form physics kssm 2020

Chapter 2 Daya dan Gerakan Iorce and Motion I
Bab 2
F
Situation 5 Situation 6

Riders on a roller coaster in a recreation park are Driver and passengers of a car are advised
assigned to seats through a specialised safety system. to wear seat belts.
The roller coaster carriage moves at sudden changes of
speed and direction.

When the carriage of the roller coaster changes
its direction of motion suddenly, the inertia of
the riders keeps them in their original state of When a car stops abruptly, the driver and
motion. The safety system ensures the riders passengers in the car are thrown forward because
remain in their seats and are not thrown out of inertia. Seat belts prevent them from being
during the motion.
thrown forward and hurting themselves.

Formative Practice 2.4
2.4

1. Explain the concept of inertia.

2. Brian wishes to pull a table cloth without toppling the things on top of the table cloth.
How can Brian do it? Explain your answer.

3. Study the following statements:

Statement 1: Objects can continue moving only if a force acts on them.
Statement 2: Rockets in outer space can move without any engine thrust.
Statement 3: Force is required to change the state of motion of objects.

(a) Which of the statements can be explained correctly using Newton’s First Law
of Motion?
(b) Give reasons of your choice.

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2.4.3 57
2.4.3