definitions Flashcards
weight
gravitational force the earth exerts o an object near or on its surface
normal f
The perperndicular forec the surface exerts on an object in contact with it
Frictional force
The force that opposes the motion of an object and acts parralell to the surface with which the object is in contact
Newts law 1
An onbect continues in state of rest or uniform velocity unless it is acted upon by a net or resultant force
Newton law 2
When a net force is applied to an object of mass, the object acceleartes in the direction of the net force. Acceleration is directly proportional to the net force and inversley proporptional to the mass
Newton law 3rd
When object A exerts a force onto object b. Object b silmutaneosuly exerts an oppositetly directed force of equal magnitude onto object A
Newtons second law in terms of momentum
The net force acting on an object is equal to the rate of change of momentum
linear momentum
The total linear momentum of an isolated system remains constant
Impulse
Product of the net force and contact time
work done
Product of the displacement and the component of the force parrallle to the displacement.
Law of conservation of energy
The total energy in a system cannot be created nor destroyed it can only be transfered from one form to another.
Principle of conservation of mecnaical energy
In the absense of air resistance or any external forces the mechanical energy of an object is costant
work energy theorum
The work done by the net force on an object is equal to the change in kinetic energy of the object
Power
the rate at which work is done
Newtons law of universal gravition
every particale in the universe atttracts evry other partical with a force that is directly proportonal t o the products of the masses and inversely prportional to the square of the distance between their centres.
Gravitational field
Force acting per unit mass
Coulumbs law
The force between two charges is dircetly proportional to the product of the charges and inversely proportional to the distance between the charges squared.
Electric field
Forceper unit charge
Potential difference
Work done per unit positive charge
Current
the rate flow of charge
ohms law
Current through the conductor is directly proprotional to the potential diffrence across the conductor at constant temprature
resistane
the materials oppositio ot the flow of electric current
Magnetic flu linkage
The product of the number of turns on the coil and the flux through the coil.
Faradays law
The emf induced is directly proportional to the rate of change of magnetic flux
Lenz law
The induced current flows in a direction so as to set up a magnetic field to oppose the change in magnetic flux.
