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Words like pressure,force and friction are also used in English literature.find their meaning in terms of Human Relationship find 4 more for such words and quote sentences.
Answers
Answer:
To stop a moving object, a force must act in the opposite direction to the direction of motion. For instance, if you push your book across your desk, the book will move. The force of the push moves the book. As the book slides across the desk, it slows down and stops moving. The force that opposes the motion of an object is called friction.
Forces and Motion
sliding book
Look at this diagram. At first, the book is at rest. A push causes the book to slide across the desk. The force of the push (big F) keeps the book moving. As the book slides cross the desk, a force of friction (f) acts in the opposite direction. The friction slows down the motion of the book. Finally, the book is once again at rest.
Types of Friction
types of friction
There are different types of friction. A book moving across the desk is an example of sliding friction. As the book slides cross the desk, the bottom of the book is touching the desk. The source of the friction is the contact between the surface of the book and the desk. The weight of the object and the type of surface it moves over determine the amount of sliding friction present between the two objects. A heavy object exerts more pressure on the surface it slides over, so the sliding friction will be greater.
Air, water and oil are all fluids. Air resistance is a type of fluid friction. As an object falls, air resistance pushes up on the object.
When you ride a bicycle, the contact between the wheel and the road is an example of rolling friction. When an object rolls over a surface, the force needed to overcome rolling friction is much less than that needed to overcome sliding friction.
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