## Conceptual Questions, Forces and Motion

See here answers to the conceptual questions included in the new course of Physics grade 11.

S.NoDescription of question
Question 1If you are riding on a train that speeds past another train moving in the same direction on an adjacent track, it appears that the other train is moving backward. Why?
Question 2Can the velocity of a body reverse the direction when the acceleration is constant? If you think so, give an example.
Question 3When you stand still on the ground, how large a force does the earth exert on you? Why doesn’t this force make you rise up into the air?
Question 4A man standing on the top of a tower throws a ball vertically up with a certain velocity. He also throws another ball vertically down with the same speed. Neglecting air resistance, which ball will hit the ground with higher speed?
Question 5The cricket coach explains that the follow through with the shot will make the ball travel a greater distance. Explain the reasoning in terms of impulse-momentum theorem.
Question 6When you release an inflated (پھولا ہوا ۔۔۔ پڑسیدلے) but untied balloon, why does it fly across the room?
Question 7Modern cars are not rigid but are designed to have crumpled zones that collapse upon impact. What is the advantage of this new design?
Question 8Why we can hit a long sixer in a cricket match rather than if we toss a ball ourselves?