Question

class 8
science
help me

Answer 1

Answer:

1.

1. contact force

2. non-contact force

3. non-contact force

4. contact force

5. non-contact force

2.

1. Sound waves enter the outer ear and travel through a narrow passageway called the ear canal, which leads to the eardrum.

The eardrum vibrates from the incoming sound waves and sends these vibrations to three tiny bones in the middle ear.

2. lesser the area the greater the force applied and lager the area lesser the force applied

3.

1. Eating junk food on a regular basis can lead to an increased risk of obesity and chronic diseases like cardiovascular disease, type 2 diabetes, non-alcoholic fatty liver disease and some cancers.

2. Plant trees around our houses because they act as sound barriers and block the unnecessary sounds coming from vehicles.

Plant trees along the roadside because plants absorb the carbon dioxide released from the vehicles on the road and release more oxygen to humans.

Planting trees will help to prevent global warming and soil erosion. Planting trees along the roadside is mainly for shade and cover from the sun and rain.

4.

1. less push because of motion law of inertia.

2. Aeroplanes have been designed as birds. Birds have a light body, shaped such as to have a minimum wind resistance when they fly to overcome the friction. Thus, aeroplanes have been designed such as to have a streamlined body to overcome the frictional force of air.

5.

1. they choose to wear shoes with nail because of the goof goof gripe.