Science test 1. State any three effects of force with an example of each. 2. Name the force which is exerted by a charged body. Why is it referred as a non-contact force. 3. Why does any object falls towards the earth? 4. How does camel walk easily on the sand surface? 5. Describe an activity to demonstrate that liquid exert pressure on the side walls of the container.
Answers
Answer:
1- three forces are
(i) gravitational force- force between mass
ex- gravity on earth
(ii) electromagnetic- like charge repel and unlike charge attract each other.
ex- magnets
(iii) strong nuclear force- between protons and neutrons in atom
ex- proton and neutron
2- electromagnetic force
3- because of gravitational force
4- Camels can walk easily in the desert because of their wide feet. Their wide feet allow the weight of their body to act on a larger surface of land reducing the pressure exerted on the land by thecamel. As we know, pressure exerted and area are inversely proportional.
5-On filling water, the rubber sheet tied to the mouth of glass tube gets stretched and bulges out. The bulging out of rubber sheet tied to the glass tube fixed in the wall of plastic bottle demonstrates that water present in plastic bottle exerts pressure on the walls of thebottle