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