Match Units w/ Equations; define qualities Flashcards
Joules
Kinetic energy, work done, gravitational potential energy
g/cm^3
Density
Newtons
Resultant force (kinetic - resistance), force (f=ma); weight (W=mg)
metres, m/s or seconds
Speed equation; d=ts or s=d/t or t=d/s
Watts
Power
m/s^2
Acceleration
cm^3
Displacement
List formulae resulting in joules measurement
Ep = mgh (gravitational force)
KE = 1/2m(v^2) [Kinetic Energy)
W = Fd (work done)
Which equations end in a product measured in Newtons?
Weight - N=10m
Force - F=ma
Resultant force - Larger - smaller; then state direction + N
(newtons)
How does acceleration differ in units from speed?
m/s^2 as opposed to solely m/s
Calculate one’s weight, force exerted, and resultant force if friction backward is 780 N and a helicopter’s drive delivers 1450 N forwards.
Weight - N=10m (object mass)
Force - F=ma
1450 - 780 = 670 N ahead (larger cancels out smaller quantity, left only with the former)
State Hooke’s Law.
The extension of a spring is proportional to the load applied to it, provided that the LIMIT OF PROPORTIONALITY is not exceeded.
Define mass and state its standard unit.
The amount of matter in an object, which remains constant regardless of weight. Standardised mass is measured in kilograms.
What’s gravity? How does it increase between a pair of objects?
Gravity is a force between all objects, although powerless by large. Distance and mass affect it; longer ranges cause gravity to weaken/vice versa, while heavier objects are more strongly attracted to each other. GRAVITY = WEIGHT!!
Describe the limit of proportionality.
The greatest load a given spring can bear whilst maintaining the elasticity to revert into its original shape.
Ockham’s Razor: past this much force on it, the spring breaks.
