When a heavy truck collides with a car, the occupants of car are more likely to be hurt than the truck driver. Why?
If the earth is struck by meteorites, the earth will slow down slightly. Why?
If a cork is released from the bottom of a jar filled with water, what will happen and why?
If the sun somehow collapsed to form a black hole, what effect would this event have on the orbit of the earth?
Can a body be regarded in a state of rest as well as in motion at the same time? Give an example.
Does a ship sink more in river water or in sea water? Explain.
Why is easier to lift a body in a liquid than in air?
A cork is floating in water. What is the apparent weight of the cork?
How will you make difference between density and specific gravity of a body?
A man carrying a bucket of water on his hand always leans to the opposite side. Explain.
Is it possible for a solid body to have no matter at it centre of gravity?
How does ‘g’ at a point vary with distance from the centre of the earth? Where is the highest value of ‘g’? Explain.
2. If action and reaction are always equal and opposite, why don’t they always cancel each other?
Steel balls sink in water but they don’t sink in mercury. Why?
The earth moving round the sun actes upon by a force, the work on earth by this force. Do you agree with this statement?
Why is the kinetic friction less than the limiting friction?
A pendulum clock is taken to moon. Will it gain or lose time?
The weight of a body is less inside the earth than on the surface. Explain.
Distinguish between conservative and non-conservative force.
Explain why a coin placed on a cardboard covering a glass falls into the glass when the cardboard is pulled to one side?
What do you mean by geo-stationary satellite? Explain?
Why an astronaut in a space capsule orbiting the earth experiences a feeling of weightlessness?
What is the difference between centre of gravity and centre of mass of a system?
Can a body be in equilibrium if it is in motion? Explain.