Classifying forces.

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Presentation transcript:

Classifying forces

What is a force A force is a push or a pull

2 types of forces Contact Forces Applied force Spring force Frictional force Tensional force Normal force Air resistance Distant forces Gravitational force (gravity) Electrical force Magnetic force

Contact forces Chart Type of force Abbreviation Definition Applied Fapp Force that is applied to an object by a person or another object. Normal Fnorm A support force exerted upon an object that is in contact with another stable object Friction Ffric Is a force exerted by a surface as an object moves across it or makes (sliding) an effort to move across it (static) Tension Ftens Force that is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends. Spring Fspring Force exerted by a compressed or stretched spring upon any object that is attached to it

Gravity Gravity force- attraction to between two objects. Also known as weight Fgrav All objects upon earth experience a force of gravity that is directed downward towards the center of the earth.

Forces are Vectors Force has both size and direction SIZE of the vector = Magnitude (how strong the force will be) DIRECTION of the vector= which direction the force is applied on the object.

Balanced and unbalanced forces

Balanced Forces Net force- when all the forces are combined Net force= 0, the forces acting on the object is zero Net force= 0= blanced= No Motion

Unbalanced forces ONLY an unbalanced force can change the motion of an object. Unbalanced forces cause motion (acceleration)

Free Body Diagrams Use force vectors to illustrate the forces acting upon an object or body. Show the magnitude and the direction of the force acting on objects.