Question

Important Questions from Force chapter ?​

Answer 1

Explanation:

Answer Questions

Question 1.

What is the name of the instrument used to measure atmospheric pressure?

Answer:

Barometer

Question 2.

Give two examples of contact force.

Answer:

Muscular force

Force of friction

Question 3.

Name the force exerted on a ball of dough to make a flat chapati.

Answer:

Muscular force

Question 4.

What kind of force is an electrostatic force?

Answer:

Non-contact force

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Answer 2

Explanation:

sin2A = 1 − cos2A ⇒ sin2A = (1 – cos A)(1 + cos A) Hence proved