What are the changes caused due to force applied on an object?
An inflated gas balloon is placed in a sealed jar which is connected to an evacuating pump. What will be observed if the air inside the jar is pumped out? Give a reason justifying your answer.
What are the contact forces? Describe two forces that are contact forces.
Describe an activity to observe the relation of pressure and surface area of an object.
How can you demonstrate the presence of atmospheric pressure experimentally? Illustrate with a diagram.