physics

• vector quantity 


  a physical quantity with both magnitude and direction
• scaler quantity


  a physical quantity that has magnitude only
• distance


  the length of path travelled (scalar)
• displacement


  a change in position (vector)
• speed


  the change of rate of distance
• velocity


  the rate of change of position (vector)
• acceleration


  the rate of change of velocity (vector)
• weight (Fg)


  the gravitational force the earth exerts on any object, on or near its surface
• normal force (Fn)


  the perpendicular force exerted by a surface on an object in contact with it
• frictional force (Ff)


  the force that opposes the motion of an object and acts parallel to the surface with which the object is in contact with
• newtons first law


  an object continues in a state of rest or uniform velocity unless acted upon by a net or resultant force
• inertia


  the property of an object that causes it to resist change in a state of rest of uniform motion
• newtons second law 


  when a net force (Fnet) is applied to an abject of mass (m), it accelerates in the direction of net force
• newtons second law (in therms of momentum)

  the net force acting on an object is equal to the rate of change of momentum
• newtons third law


  when Object A exerts a force on Object B, Object B simultaneously exerts an oppositely directed force of equal magnitude back on Object A
• linear momentum


  the product of mass and velocity of the object
• law of conservation of linear momentum


  the total linear momentum of an isolated system remains constant
• elastic collision 


  a collision in which both momentum and kinetic energy are conserved
• inelastic collision


  a collision in which only momentum is conserved
• impulse (J)

  the product of the net force and the contact time
• work


  the product of the displacement and the component of the force parallel to the displacement
• lenz's law


  The induced current flows in a direction so as to set up a magnetic field to oppose the change in magnetic flux
• faradays law


  The emf induced is directly proportional to the rate of change of magnetic flux (flux linkage)