-) Static friction force acts in response to a force trying to cause a stationary object to sta moving. If there is no such force acting on an object, the static friction force is zero. there is a force trying to cause motion, the static friction force will increase up to maximum value before it is overcome and motion starts. Give some ways how to redu static friction.

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Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.