Forces - Force Basics Flashcards
what are vector quantity’s
have magnitude and direction
e.g. force, velocity, displacement, acceleration and momentum
what are scalar quantities
magnitude, no direction
speed, distance , mass temperate and time
what is a force
a push, pull or twist on an object
what is a contact force
objects have to be touching.
friction, air resistance, tension and normal contact force
what are 3 examples of non contact forces
magnetic, gravitational, electrostatic
what are 2 important effects of gravitational force
makes things accelerate towards the ground
gives everything a weight
what is mass
the amount of stuff in an object. this will be the same value anywhere
what is weight
force acting on an object due to gravity, caused by gravitational fields
what does gravitational field strength depend on
stronger the closer to the mass causing the field and stronger for larger masses.
what is the centre of mass
a point in the middle of a uniform object where u assume the mas is concentrated
what is the equation for calculating weight
weight(N) = mass(Kg) x gravitational field strength (N/Kg)
are weight and mass directly proportional
yes
what is a resultant force
a single overall force which is the product of lots of forces
what is a free body diagram
each force is represented by an arrow which is proportional to the size of the force
what is a scale drawing
draw the forces as arrows proportionally to the size of the force tip to tail and in the correct direction. draw a line from the start of the first force to the end of the last force. this gives the length and direction of the resultant force
