Explain the following:
(a) When a train suddenly moves forward, the passenger standing in the compartment tends to fall backwards.
(b) When a Corridor train suddenly starts, the sliding doors of some compartment may open.
(c) Peope often shake branches of a tree for getting the fruits down.
(d) After alighting from a moving bus, one has to run for some distance in the direction of bus in order to avoid falling.
(e) Dust particles are removed from a carpet by beating it.
(f) It is advantageous to run before taking a long jump.
Explain the following:
(a) When a train suddenly moves forward, the passenger standing in the compartment tends to fall backwards.
(b) When a Corridor train suddenly starts, the sliding doors of some compartment may open.
(c) Peope often shake branches of a tree for getting the fruits down.
(d) After alighting from a moving bus, one has to run for some distance in the direction of bus in order to avoid falling.
(e) Dust particles are removed from a carpet by beating it.
(f) It is advantageous to run before taking a long jump.
(a) When a train suddenly starts, the passengers tend to fall backwards. This is because the lower part of the body, which is in contact with the train, begins to move while the upper part of the body tends to maintain its position of rest. As a result, the upper part tends to fall backwards.
(b) The frame of the sliding door being in contact with the floor of the train also comes in motion on start of the train, but the sliding door remains in its position due to inertia. Thus, the frame moves ahead with the train, while the door slides opposite to the direction of motion of the train. Thus, the door may shut or open accordingly.
(c) When the branches of the tree are shaken, they come in motion, while the fruits due to inertia remain in a state of rest. Thus, the larger and weakly attached fruits get detached from the branches and fall down due to the pull of gravity.
(d) When people alight from a moving bus, they continue to run alongside the bus to avoid falling. If they were to stop at once, the feet would come to rest suddenly but the upper part of the body would still be in motion and they would tend to fall forward.
(e) The part of the carpet where the stick strikes comes in motion at once, while the dust particles settled on it remain in the state of rest due to inertia of rest. Thus, a part of the carpet moves ahead with the stick leaving behind the dust particles that fall down due to gravity.
(f) When running, the athlete brings his body in the state of motion. When the body is in motion, it becomes easier to take a long jump as the inertia of rest is negated.
(a) When a train suddenly starts, the passengers tend to fall backwards. This is because the lower part of the body, which is in contact with the train, begins to move while the upper part of the body tends to maintain its position of rest. As a result, the upper part tends to fall backwards.
(b) The frame of the sliding door being in contact with the floor of the train also comes in motion on start of the train, but the sliding door remains in its position due to inertia. Thus, the frame moves ahead with the train, while the door slides opposite to the direction of motion of the train. Thus, the door may shut or open accordingly.
(c) When the branches of the tree are shaken, they come in motion, while the fruits due to inertia remain in a state of rest. Thus, the larger and weakly attached fruits get detached from the branches and fall down due to the pull of gravity.
(d) When people alight from a moving bus, they continue to run alongside the bus to avoid falling. If they were to stop at once, the feet would come to rest suddenly but the upper part of the body would still be in motion and they would tend to fall forward.
(e) The part of the carpet where the stick strikes comes in motion at once, while the dust particles settled on it remain in the state of rest due to inertia of rest. Thus, a part of the carpet moves ahead with the stick leaving behind the dust particles that fall down due to gravity.
(f) When running, the athlete brings his body in the state of motion. When the body is in motion, it becomes easier to take a long jump as the inertia of rest is negated.
