Question

Answer the following question in detail:
1. what is force? List it's main effects.
2. When does charged body attract another body and when does it repel it? Suggest an activity to demonstrate this phenomenon.
3. What are advantages and disadvantages of friction?
4. Write short notes on : (1)Android barometer
(2) Buoyancy. ​

Answer 1

Answer:

a force is a push or a pull and we need energy to do

without friction life would be impossible we can't walk. write ,vehicles would skid disadvantages can be wastage of energy

barometer is used to measure the weight of a body and differences

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Answer 2

1) force acting on an object causes the object to change its shape or size, to start moving, to stop moving, to accelerate or decelerate. When there's the interaction between two objects they exert a force on each other, these exerted forces are equal in size but opposite in direction.

2) A charged body attracts a neutral body or a body of an opposite charge. A charged body repels a body of the same charge. The above phenomenon can be illustrated by the ebony and glass rod activity.

3) Friction produces unnecessary heat leading to the wastage of energy. The force of friction acts in the opposite direction of motion, so friction slows down the motion of moving objects. Forest fires are caused due to the friction between tree branches.

4).(1) A barometer is a scientific instrument that is used to measure air pressure in a certain environment. Pressure tendency can forecast short term changes in the weather. Many measurements of air pressure are used within surface weather analysis to help find surface troughs, pressure systems and frontal boundaries.

(2)Buoyancy or upthrust, is an upward force exerted by a fluid that opposes the weight of a partially or fully immersed object. In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid.