P2 - Forces Flashcards
define scalars
have magnitude only
example : energy distance speed pressure
define vectors
have magnitude and a direction
examples : displacement velocity momentum
define force
push or pull that acts on an object due to the interaction with another object
define contact force
the objects are physically touching
examples : friction normal reaction air resistance
define non-contact forces
the objects are physically separated
example : gravitational electrostatic magnetic
define weight
force acting on an object due to gravity
the force of gravity close to earth is due …
to the gravitational field around earth
what’s the equation connecting mass gfs and weight
W=mg
(N=Kg x m/s2 or N/Kg)
weight is directly proportional to an objects mass because
gfs on earth is 9.8
one joule is done when
1N force causes a displacement of 1m
define work done
energy transferred on the object
what’s the equation with work done force and distance/ displacement
W=fs
J= N x m
define elastically
object returns back to its original shape once the forces are removed
eg - hair bobble
define inelastic
object doesn’t return back to its original shape once the forces are removed
eg - blu tack
what do you need for something to change shape
at least 2 forces
