P8 - Forces And Ballance✔️ Flashcards
what is magnitude?
size of a quantity
what are scalars?
physical quantities that have size/magnitude but no direction
what are vectors?
physical quantities that have size/magnitude and direction
examples of scalar quantities?
distance, volume, density, mass, time, energy
example of vector quantities?
force, velocity, displacement and acceleration
equation for speed?
speed = distance/time
equation for velocity?
velocity = displacement/time
equation for force?
force = mass x acceleration
why is acceleration a vector quantity?
acceleration is a change in velocity therefore having direction and therefore a vector making it a vector quantity.
what do arrows show?
the direction of the vector quantity and the length represents the magnitude of the vector quantity.
what is force?
a force is a push or pull that acts on an object. Force is measured in Newtons(N)
what are example of contact forces?
friction, air resistance ,stretching(tension)
what are example of non-contact forces?
magnetic force , gravitational forces , electrostatic force
Newtons third law states …?
when two objects interact with each other they exert equal and opposite forces on each other. Example, if a person pushes a wall with a force of 50N the wall exerts and equal and opposite force back of 50N
Newtons first law states ….?
in order to make an object move from rest the forces must be unequal.
what is friction?
friction is the force exerted by a surface against an object when it moves across it.