#physics #teextbook #forces #forceactingonanobject

Pg:- 85 to 93

Ch:- 5

• Force can change the size and shape of an object. *It can stretch, squash, bend and twist*

• Materials like rubber are stretchy, they spring back to their original shape as long as too much force is not applied.

• Some materials are less springy, they become permanently deformed when forces act on them.

  --> When two cars collide, the metal panels of their bodywork are bent.

  --> Gold and silver can be deformed by hammering them.

• Weights that are hung on the end of the spring are called load.

• If the load is increased too far, the spring becomes deformed.

Extension of a spring

• The increase in length of the spring is known as extension.

• Normal Force (N): This is the perpendicular force exerted by a surface against a solid object resting on it. For instance, a book on a table experiences a normal force from the table pushing upward.

• Friction (f): This is the force that resists the relative motion or tendency of motion between two surfaces in contact. It acts parallel to the surfaces.

  • Static friction acts when there is no motion between the surfaces.

  • Kinetic friction occurs when the object is moving.

• Tension (T): When a solid object is pulled by a string, rope, or chain, tension is the pulling force transmitted through the string.

• Applied Force (F): This refers to any external force applied to a solid object, such as pushing a block or pulling a cart.

• Drag Force (air or fluid resistance): This force opposes the motion of a solid through a fluid (air or liquid). It depends on the shape of the object, the fluid properties, and the speed of the object.

(Not fully completed)