State the energy transformation that takes place in each of the following activities:
(i)
dry cell in use;
(ii)
solar panel in use;
(iii)
electric stove in use;
(iv)
hammering of a piece of metal.
A piece of stone is dropped from a height to the ground.
State the energies possessed by the stone
i)
just before it was released from the maximum point;
ii)
midway between the fall;
ii)
just before it hit the ground.
State the energy changes that take place in each of the following processes.
i)
An orange falls from a tree to the ground
ii)
A carpenter hits a nail with a raised hammer.
A coconut of weight 50 N hangs 15 m above the ground.
i)
Name the type of energy possessed by the coconut.
ii)
Calculate the value of this energy
A body of mass 12.0 kg is placed on an orange tree 20.0 m above the ground
(i)
Calculate its potential energy with respect to the ground
(ii)
If the body is released from this height, what will be its kinetic energy just before it hits the ground.
[g = 10 ms-2]
A boy throws a stone vertically up into the air. What are the energy changes that take place as the stone falls to the ground?
What energy changes take place in the following processes?
(i)
A mango drops from a tree.
(ii)
A carpenter hits a nail with a hammer.
(iii)
A torch is switched on.
Fig. 4 is an illustration of a body of mass 20 kg placed on top of a wall of height 10 m.
Calculate the energy of the body.
What energy transformations take place in each of the following activities?
i)
Using a flashlight battery to produce light in a bulb.
ii)
Using a microphone to address a gathering.
i)
Define potential energy.
ii)
An object of mass 10 kg is moving at a velocity of 2 ms-1.
Calculate the kinetic energy of the object.
A body of mass 100 kg is raised to a height of 2 m above the ground.
i)
State the name of the energy possessed by the object by reason of the new position.
ii)
Calculate the value of this energy.
[g = 10 ms-2]
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