Momentum (Exercise)

Exercise: Inertia

Based on the principle of inertia, 1. Explain why passengers in a moving car lurch forward when car stops

suddenly.2. State two safety features in a car. Explain how this feature can lessen

the injuries which the driver would sustain if an accident occur.

3. A and B are two spheres with weights of 1kg and 2kg respectively. Sphere A is suspended from the ceiling by string X which is similar to

string Y. Bothe strings are able to withstand a tensile force of 20N. Sphere B is lifted to the same height as sphere A and sphere B is then released, Explain what will happen to the system. Provide reasons in your explanation

4. The figure above shows a customer shopping in a supermarket. Initially he pushes an empty trolley and later a full trolley. The shopper finds it is more difficult to push a full trolley than an empty trolley. He also find that it is more difficult to stop the full trolley. Explain the factors which cause the shopper to experience these difficulties while pushing his trolley and then with the help of apparatus such as jigsaw blade, plasticine and other instrument, plan an experiment to investigate the factors stated. i) aim of the experiment ii) variables in the experiment iii) list of apparatus and materials iv) arrangement of the apparatus v) the procedures of the experiment, which includes the method of controlling the manipulated variable and the method of measuring the responding variable. vi) the way you would tabulate the data vii) the way you would analyse the data

5. On arriving at a station, passengers in a train are reminded not to jump off the train while it is still moving. Why this reminder is important?