Question

plz answer the question ​

Answer 1

Answer:

1) because ear has hearing sense that connect to our brain, so we are able to hear with our ears

2) for increasing friction, we have to make the surface rough

for reducing friction, we have to make the surface plain

Answer 2

Explanation:

our ears have a liquid stored in the cochlea. this liquid along with several tiny bones like hammer, anvil and stirrup and a flap like structure called eardrum picks up vibrations from the surrounding and transmit it to our brain using auxillary nerves. In this way we can hear.

Friction is a so called force which acts in the direction opposite to motion. We can increase friction on a surface by vigorously rubbing and scratching the surface , by creating grooves to increase the grip etc. We can reduce the friction on a surface by applying oil , grease, bearings etc so as to make the surface smooth.