NCERT Class VIII Science Solutions: Chapter 11-Force and Pressure Part 3

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Question 10:

Where do we apply a force while walking?

Answer:

While walking we apply force on the ground.

Question 11:

A girl is pushing a box towards east direction. In which direction should her friend push the box so that it moves faster in the same direction?

Answer:

Towards east

Question 12:

As showing in fig is a Magnetic circuit

Magnetic Circuit

As showing in fig is a Magnetic circuit

In the circuit shown in Fig.11.6, when the key is closed, the compass needle placed in the match box deflects. Name the force which causes this deflection.

Answer:

Magnetic force

Question 13:

During dry weather, clothes made of synthetic fibre often stick to the skin. Which type of force is responsible for this phenomenon?

Answer:

Electrostatic force

Question 14:

While sieving grains, small pieces fall down. Which force pulls them down?

Answer:

Force of gravity

Question 15:

Does force of gravity act on dust particles?

Answer:

Yes

Question 16:

A gas filled balloon moves up. Is the upward force acting on it larger or smaller than the force of gravity?

Answer:

Upward force is larger than the force of gravity

Question 17:

Does the force of gravitation exist between two astronauts in space?

Answer:

Yes