Question

Give two ways in which we use transparent substances.
d. What is gravity?
List two ways in which friction is useful to us.​

Answer 1

Answer:

Objects made from transparent materials, such as glass and clear plastic, are common. These materials play an important part in day-to-day life. Windowpanes, eyeglasses, light bulbs, and mirrors are made from transparent materials.

the force that attracts a body towards the centre of the earth, or towards any other physical body having mass.

Helpful frictional forces

For example: friction between our shoes and the floor stop us from slipping. friction between tyres and the road stop cars from skidding. friction between the brakes and wheel help bikes and cars to slow down.

Answer 2

Answer:

we use transparent substances in

1: Lenses of the glasses

2:On the windows of the houses

gravity is the attracting and  weakest force of nature exerted by all the objects

friction helps us to stop the moving object and to get a better grip on the shoes

Explanation: