Question

E. Answer the following questions.
1. Define force. Is it necessary for the two bodies to be in direct contact for a
force to exist between them? Explain with examples.
2. State three effects of a force. Give suitable examples.
Give reasons for the following statements-
(a) 'Snow shoes' are more effective than ordinary shoes for walking on
Snow.
ct:
(b) Porters place a large round piece of cloth on their heads when they
carry heavy loads.
(c) A sharp knife cuts vegetables and fruits more effectively than a blunt
knife.
(d) School bags are provided with wide straps to carry them.
(e) It is much easier to burst an inflated balloon with a needle than
(directly) with the finger.
(f) Mountaineers may suffer from nose bleeding at high altitudes.
(g) Airplanes have pressurised cabins for passenger safety while flying high
in the atmosphere.
10
4.
ROD A
ROD B
Sand
5.
С
B
Two rods, 'A' and 'B', of the same weight and
equal length, have different thicknesses. A boy,
while playing with them on a beach, held them
vertically on the surface of sand as shown in the
figure. Which one of them will sink less? Explain.
Three holes, A, B and C, are made in an empty can
at different levels, one over the other, as shown in
the figure. They are (temporarily) closed with an
adhesive tape. The can is now filled with water.
What will you observe, when the tape (on all of
them) is pulled out? Justify your answer.
Make two tiny holes, of the same size, at equal
heights from the bottom in a plastic bottle. Cover
them and fill the bottle with water. Let the 'covers'
be now removed. State the 'observations, and the
resulting 'conclusions', based on this activity.
83
A
6.
B​

Answer 1

Answer:

plz ask the questions one by one