Summary Grade 11 physical science commonly asked definitions term 1 part 1

physical science grade 11
Short summary term 1 notes
Vectors and scalars
Vector quantity
Physical quantity that has both magnitude and direction
Scalar quantity
Physical quantity that has only magnitude and no direction
Resultant vector
Single vector having the same effects as two or more vectors together


Forces
Types of forces
Normal force(N)
A force or a component of a force that the surface exerts on an object in contact with it
Tension force(T)
Is a pulling force
Gravitational force (W)
Force that the earth exerts on an object


Friction
Static friction (fs)
Force that opposes the tendency of motion of an stationary object
Kinetic friction (fk) kyle
Force that opposes the tendency of motion of a moving object and is parallel to the surface


Newton's laws
Newton's first law
States that an object will remain in it's state of rest at a constant or uniform velocity unless a non zero
resultant force acts on it.


Newton's second law
States that when a resultant force or net force acts on an object the object will accelerate towards the
direction of the force with an acceleration directly proportional to the force and inversely proportional
to its mass.


Newton's third law
States that when object A exerts a force on object B ,object B will simultaneously exert an oppositely
directed force of equal magnitude on object A.


Newton's law of gravitation
States that everybody in the universe attracts every other body with a gravitational force directly
proportional to the product of their masses and inversely proportional to the square of the distance
between their centres.