Question

1. If a balloon filled with air and it’s mouth untied, is released with its

mouth in downward direction, it moves upwards. Why?

2. The persons equipped to be dropped by parachutes from an aircraft

are called paratroopers. Why do paratroopers roll on landing?

3. Explain why it is possible for a small animal to fall from a

considerable height without any injury being caused when it reaches

the ground.

4.Explain why, when a fireman directs a powerful stream of water on

the fire from the hose pipe, the hose pipe tends to go backward.

5.Do action and reaction act on the same body or different bodies?

How are they related in magnitude and direction? Are they

simultaneous or not?

6. If the mass of the body and the force acting on it are both doubled,

what happened to the acceleration

7.Write the SI units for the following

* velocity *acceleration *force

*momentum *impulse

8. Complete the following

a) force = ——-x———- b) 1 N= ——-x——-

c) 1N= ———-dyne d) 1kgf = ———

e)momentum=——-x——-

9 A high jumping athlete is provided either a cushion or a heap of

sand on the ground to fall upon. Why?

10. A hanging carpet is beaten with a stick, the dust particles start

coming out of it, Explain why?

11. Why road accidents at high speeds are much dangerous than the

road accidents at low speeds?

12. Why force will change the shape of an object, balanced or unbalanced? Explain your answer.

ANSWER THIS QUESTION PLS ....​

Answer 1

Answer:

7.)

velocity =m/s

acceleration =m/s²

force =N

momentum =kg m/s

impulse =Ns

8.)

a)force = mass × acceleration

b.)1N=kg m/ s²

c.)1N=10⁵ dyne

e) momentum =mass ×velocity