Question

D. Answer the following questions in brief.
1.
1
In the following situations, identify the agent exerting the force. Also,
E. Ans
the effect of the force in each case.
(a) Squeezing a piece of lemon between the fingers to extract its juice,
(b) A person diving into a swimming pool.
2.
3
(c) A labourer moving a loaded cart.
(d) A car coming to rest once its engine is switched off.
(e) An athelete making a high jump to clear a bar kept at a certain height.
An object experiences a net non-zero force. Is it possible for the object
move with a constant speed along a straight line?
2.
3.
Distinguish between:
(a) balanced and unbalanced forces.
(b) contact and non-contact forces.
When we throw a ball upwards, what happens to its speed while it is goin
up? Give reason for your answer.
5. The figure shows a man with a parachute.
(a) Name the force which is responsible for his
downward motion. Is it a contact force or a
non-contact force?
(b) Will the man come down with the same speed
without the parachute? Explain.
6. How would the pressure (exerted by a force on an area) change if-
(a) the area is doubled keeping the thrust constant?
(b) thrust is doubled keeping the area constant?
7. When will a diver 'experience a greater pressure'--100 cm below the surface
of water or 200 cm below the surface of water? Justify your answer.​

Answer 1

Answer:

this is very long i cant give answer

Answer 2

Will the man come down with the same speed

without the parachute? Explain.

6. How would the pressure (exerted by a force on an area) change if-

(a) the area is doubled keeping the thrust constant?

(b) thrust is doubled keeping the area constant?

7. When will a diver 'experience a greater pressure'--100 cm below the surface

of water or 200 cm below the surface of water? Justify your answer.