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Some examples from this set of practice questions
1.
What kind of force keeps a body moving in a circular path towards the centre of the path?
Answer: Centripetal force
2.
What force keeps a body(car) moving in a circular path from skidding off the course of it\'s motion?
Answer: Friction between the tyres of the car and the road.
3.
Name the two forces that act on a body moving in a circular path.
Answer: 1. Centripetal Force: directed towards the centre of the circular path 2. Centrifugal Force: directed towards the outside of the circular path
4.
State two factors that affect the viscosity of a fluid
Answer: 1. Temperature: It affects the viscosity of a fluid in an inverse relation i.e the higher the temperature, the less viscous the fluid becomes and vice versa. 2. The nature of the area of the fluid. Liquids tend to have higher viscosities than gases.
5.
What is impulse?
Answer: Impulse is a large force acting for a very short period of time. In other words, it is the product of force and time. Mathematically, Ft=m(v-u) F*t is the impulse. F is force t is time m is mass of the body v and u are the final and initial velocities respectively
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