topic 5 forces Flashcards
what is scalar quantity
a quantity that only has magnitude
what is a vector quantity
a quantity that has both a magnitude and an associated direction
what is force
a push or pull acting upon an object due to an interaction with another object
what are the 2 categories of forces
contact and non contact
give three examples of contact forces
friction, air resistant, tension
give three examples of non contact forces
gravitational, electrostatic, magnetic
is force a vector or scalar quantity
vector
give three examples of vector quantity
velocity, displacement, force
give three examples of scalar quantities
time, temperature, mass, speed, distance, energy
what is weight
the force that acts on an object due to gravity and the objects mass
what quantities do weight depend on
objects mass and the gravitational field strength at the given position in the field
unit for weight
newton (n)
unit for gravitational field strength
n/kg
what is it meant by an objects centre of mass
the single point where an objects weight can be considered to act through
what is the name given to the single force that is equivalent to all the other forces acting upon it
resultant force
what is displacement
its the measurement of distance and direction in a straight line from an objects starting point to its finishing point
what is speed
speed is how fast youre going with no regard to direction
what is acceleration
the change in velocity in a certain amount of time
what is friction
the force between 2 surfaces that are sliding
what is newtons first law
if the resultant force on a stationary object is 0 the object will remain stationary. if the resultant force on a moving object is on 0 then it will keep on moving on that constant speed