Answer these questions. H. 1. Write the possibilities when two or more than two forces act simultaneously on an object. 2. Name the two categories of force and give two examples of each. 3. Describe an experiment to suggest that magnetic force is a noncontact force. 4. What is the force of friction? State the direction of its action. 5. How does a body get charged on rubbing? Explain. 6. Describe the role of gravitation in supporting life on the earth. 7. Why are the tips and edges of cutting and piercing tools made sharp? 8. Describe an experiment to show that the pressure in liquids increases with depth. 9. State the effects of force.
Answers
answer:- 1. 1)The object will move towards the direction of the net resultant force. 2)If the object is moving, it might decelerate or accelerate depending on the direction of the resultant force in respect to the direction the object is moving in.
2.Basically, there are two types of forces, contact forces, and non-contact forces. Gravitational forces, electric forces, magnetic forces, nuclear forces, frictional forces are some examples of force. Gravitational force. Electromagnetic force.
3.procedure - take a magnet and bring it near iron nails. observation - u will observed that the nails are attracted by the magnet. result-oriented it shows that magnetic force is non contact force. precaution - magnet is not touching the nails.
5.When two different materials are rubbed together, there is a transfer of electrons from one material to the other material. This causes one object to become positively charged (the electron loser) and the other object to become negatively charged (the electron gainer).
6.Gravity keeps everything on Earth from floating away! It plays a crucial role in the development of life. Gravity is the force that pulls objects to Earth. Without gravity, we would have no atmosphere.
7.a) cutting and piercing tools are made sharp because the area of contact reduced so that pressure increases and cutting become easy.
8.The pressure exerted by a liquid depends on the height of the liquid column. Take a plastic bottle. ... If we pour more water in the plastic bottle to increase depth, we will see that the bulge in the rubber sheet increases. This indicates that the pressure exerted by water increases with increasing depth.
9.Two effects of a force applied on a body are: (i) It can change the state of movement of the body on which force is applied, i.e. it can move a stationary object or stop a moving object. (ii) It can change the shape and size of an object.