Why does ice melt when heated?
ice is matter and heat is the energy.
Similarly can I know the matter and energy in the below questions?
a. Why do objects thrown upward fall down?
matter -> Objects
energy -> ??
b. Why does a metal coin sink in water while a wood piece floats?
c. Why are shadows formed?
1. Ice melts on giving heat because the molecules that make ice in higher temperature becomes separated and hence the molecules of water are free to move in higher temperature. Change of ice to water is an example of change of state of matter. Matter exists in three states solid, liquid and gas and we can change between the states of matter.
a. Objects fall down because earth pulls the object by her force of gravity.
b. Anything that floats on water or any liquid must displace liquid of weight more or equal to the weight of the thing. A wood displaces a lot more water than its weight so it floats but a coin sinks because it displace less water than its weight.
c. Shadows are formed when we place any opaque object in the path of light. As because light travel in straight lines,the light cannot reach those parts blocked by the object and shadows are formed.
your first question answer
when ice is heated,the molecules absorb a great power which they have to take out.So they start vibrating and moving very rapidly so when they start moving they now occupy a lot of space and now they can move. now tey turn into water
ans.-because gravitational force is acting opposite to the object.
ans.- because wood occupies more space so bouyant force is acting equally to it.
ans.-A shadow is formed if an opaque baulk blocks a path of light. This is because light travels while surrounded by straight lines. Light cannot bend around an object so it forms a shadow. Basically shadow starts where the light is blocked.