P1 Motion Flashcards
Speed
-scalar quantity
-only has magnitude;no direction
-measured in meters per second
Speed formula
Speed(v) =total distance(m)/time taken(s)
Velocity
-vector quantity
-has magnitude and direction
Acceleration
-Something is accelerating if the velocity is changing.
-measured is metres per second squared
Acceleration formula
acceleration(a) =
change in velocity(v-u)
/time taken(s)
Motion graphs
-Speed increasing is postive gradient(/)
-Speed decreasing is negative gradient ()
-straight line shows that acceleration is constant
-curved line shows that acceleration wasn’t constant
Acceleration due to gravity
-an object in free fall will accelerate at a constant rate. This rate is acceleration due to gravity.
-average value: 9.8 m/s2
Mass
The mass of an object is a measure of the amount of matter it contains.
Weight
-The weight of an object is the force that acts downwards on an object due to gravity
-measured in Newtons(N)
Formula of weight
Weight(w)=mass(m)/gravitational field strength(g)
Density formula
p(not the letter p)
P=mass(m)/volume(v)
Newstons first law
An object has a constant velocity unless acted on by a resultant force
Newtons 2nd Law/ Force formula
Force=mass×acceleration
Newtons 3rd law
Every action has an equal and opposite reaction force
Resultant force
The sum of the forces acting on an object. The change in an objects motion is caused by the resultant force.
