nswer.
7. What are the different types of contact forces? Illustrate each with
examples.
Answers
Types of contact force:
1)Frictional Force: Friction is a force exerted by a surface against the motion of a body across its surface. Friction is the reason why your car comes to a standstill if you don’t press the accelerator. The frictional force is opposing the rotation of the wheels of your car. Therefore, if you leave the accelerator, the friction slowly removes all the force from the car and when it has removed the last bit of force, the car comes to a standstill.
2)Applied Force: Force which is applied to an object by another object. A person pushing a barrel is an example of applied force. When the person pushes the barrel then there is an applied force acting upon the barrel. The applied force is the force exerted on the barrel by the person and it is responsible for the motion of the barrel. Applied force may be contact force as well as non – contact force.
3)Normal Force: The normal force is also called Support force. The normal force is the support force exerted upon an object that is in contact with another fixed or stable object. For example, if a book is resting upon a surface, then the surface is exerting an upward force upon the book in order to support the weight of the book. The solid ground provides the normal force for all of us live. The normal force is proportional to the weight of the body. Larger the body larger the normal force. If a very high weight is kept on a table and it cannot provide a normal force that large, then it breaks.