Force and Pressure for class 8 | worksheet
Download force and pressure class 8 worksheet based on the latest CBSE syllabus including fill in the blanks, answer in one word, identifying the different types of forces based questions, answer in one word and long questions and answer on force and pressure chapter.
Force and Pressure class 8
Pushes and pulls are forces. The direction in which an object is pushed or pulled is called the direction of the forces. Examples to lift a glass of water, riding a bicycle, etc.
When forces are applied on an object in the same direction, they add up. The net force or resultant force of two forces acting on an object in the same direction is a single force whose magnitude is the sum of the two forces. It acts in the same direction as the two forces.
When forces are applied on an object in opposite directions, they oppose each other. The net force on the object is the difference between the two forces. This net force will act in the direction of the large force. If the two opposing forces are equal, the net force is zero.
A force can be described by stating its magnitude and the direction in which its acts. When two forces act on an object in the same or opposite direction, the effect on the object is due to the net force acting on it. In this case it is the sum or difference of the two forces.
Effect of force:
1. Force can make a stationary object move or can change its position of rest.
2. Force can change the speed of a moving object.
3. Force can change the direction of motion of a moving object.
4. Force can change the shape or size of an object.
Friction is a force that slows things down or prevents things from moving.
Gravitational force is the force with which the earth pulls everything towards itself.
Magnet is being used to pick out scraps or iron from the garbage. It is using force to lift the iron pieces. This force is called magnetic force or magnetism.
The force resulting due to the action of muscles is known as the muscular force.
The force acting on a unit area of a surface is called pressure. pressure = force/area on which it acts Note that the area is in the denominator in the above expression. So, the smaller the area, the larger the pressure on a surface for the same force. The area of the pointed end of the nail is much smaller than that of its head. The same force, therefore, produces a pressure sufficient to end the nail into the wooden plank push the pointed.
This envelope of air is known as the atmosphere. The atmospheric air extends up to many kilometres above the surface of the earth. The pressure exerted by this air is known as atmospheric pressure