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The force brings about a change is the shape of hot iron piece.
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Meghna Thapar 5 years, 10 months ago
The continuous process by which nitrogen is exchanged between organisms and the environment is called nitrogen cycle. Nitrogen is an essential nutrient, needed to make amino acids and other important organic compounds, but most organisms cannot use free nitrogen, which is abundant as a gas in the atmosphere.
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Meghna Thapar 5 years, 10 months ago
The substances which undergo combustion are called combustible substances.
When a magnesium ribbon burns, it combines with oxygen of air to form magnesium oxide, and liberates heat and light. During this process of combustion, magnesium is a combustible substance.
If we hold a piece of charcoal with a pair of tongs and heat it on the flame of a burner, it starts burning to form carbon dioxide. In this process a lot of heat is produced but only a little light is produced.
In both the examples oxygen is necessary for combustion to take place. Air is the supporter of combustion because it contains oxygen.
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Meghna Thapar 5 years, 6 months ago
As the velocity increases, the force of air in resistance to the object increases. As newton's 3rd law states, for every action there is an equal and opposite reaction. Therefore, as the force of the object on the air increases, so does the force of the air on the object. When air resistance acts, acceleration during a fall will be less than g because air resistance affects the motion of the falling objects by slowing it down. Air resistance depends on two important factors - the speed of the object and its surface area. Increasing the surface area of an object decreases its speed.
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Meghna Thapar 5 years, 10 months ago
When we want to open a door, we have to push the door handle with our hand and while closing it we pull the handle of the door. This means to move an object, it has either to be pushed or pulled. A push or pull on an object is called force.
An interaction of one object with another object results in a force between the two objects. At least two objects must interact for a force to come into play. Suppose a man is standing behind a stationary car. Since there is no interaction between the man and the car, no force acts on the car and hence the car does not move. Now, suppose the man begins to push the car, that is, he applies a force on it. The car may begin to move in the direction of the applied force due to interaction between the man and the car. Note that the man has to push the car to make it move.
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