Question

3. Give reasons for the following statements-
(a) 'Snow shoes' are more effective than ordinary shoes for walking on
snow.
(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.
Chapter ( Force and pressure)
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Answer 1

Snow shoes with spikes are more effective for walking on snow than ordinary shoes because they create more friction as compared to ordinary one which is necessary for walking on a slippery surface as snow

Answer 2

Snow shoes with spikes are more effective for walking on snow than ordinary shoes because they create more friction as compared to ordinary one which is necessary for walking on a slippery surface as snow