Govt. Model High School Nabha
Project is made by Teacher Name: Sh. Jagdish Lal (Science Master) (B.Sc.(Non Medical) B.Ed.) Students Name: Rishav Modgill Sachin Kumar
FORCE
What is Force? When we want a stationary body to move, what causes it to move. On the other hand. what action brings a moving body to a state of rest? This change in the original state of a body is carried out by a known or some time unknown external agent called Force
Force is that external agent which when acting on a body may or may not change its (a) State of rest in the motion (b) State of motion into rest (c) Direction of motion. Force has both magnitude as well as direction so it is a vector quantity the C.G.S. unit of force is Dyne and S.I. unit is Newton
Effects of Force
Force can produce motion in a static body When a played hits a football in rest it starts moving. To lift a body lying at rest we apply certain force
Force can increase or decrease the speed If a man is driving cycle and force is applied in the direction of motion then the speed of cycle will increase and if force is applied in the direction opposite to the direction of motion then the speed of cycle will decrease
Force can change its direction of a moving body When a bats man hits the ball. Thrown by a man ball changes its direction by the force applied by batsman
Force can deform shape of a body By applying force on a rubber band it increase in length and after releasing force it comes into its original position
Types of Force
Muscular Force It is the force applied by muscular to pull or push any body. As to press tooth paste tube, or to hit a ball to drive cycle etc.
Force of Friction The force which opposes the motion of body when it lies on inclined plane. It acts between the two surfaces in contact. The value of force of friction depends upon the nature of the surfaces in contact. As a block and a ball lying on the same inclined plane starts moving at different time. A ball starts rolling very quickly while a block takes more time to move. Depending upon the surface area of block and ball in contact
Gravitational Force: - It is the force with which every body of universe attracts each other. As plants and earth moves around the sum. It is due to the gravitational force that keeps the plants moving around sun.
Magnetic Force:- It is the force with which a magnetic attracts the magnetic substance like iron. A magnet can lift heavy pieces of iron in a factory or workshop
Electrostatic Force If we rub plastic comb with our hair it starts attracting small pieces of paper. The force by which it attracts is called electrostatic force by rubbing electricity is produced on comb known as static electricity