Mechanics Flashcards
(29 cards)
What is the equation for newtons second law?
F=m*a
Unit of force?
N= kg*m/s^2
What is the force of gravity used for?
Calculate weight
Force of gravity equation
Fg=m*g
Acceleration due to gravity
Unit of mass
Kg
What is specific gravity/relative density?
Comparing density of substances
Formula for specific gravity/realative density
RD=p substance/p water
P= density
Formula for density
P= m/v
Must common units for density?
Kg/L or g/ml
What is the density of water?
1000kg/m^3
What does relative density tell us about how much of the object will be under water when placed in water?
Rd = % of object submerged in water
How much of the object is submerged when rd > 1?
100%
What is work?
W =F* d
What is the unit of work?
Nm = J
What is the formula for gravitational potential energy?
U=mgh
What is the unit of gravitational potential energy?
J
Formula for kinetic energy?
Ek=1/2•m•v^2
Unit of kinetic energy
J
U Max =?
U Max = Ke Max
When is gravitational potential energy at its max?
At Max height
When is kinetic energy at its Max?
Right before the object hits the ground
When kinetic energy is at its max, what is the gravitational potential energy?
At its lowest
Equation for momentum
p=m•v
F•🔺t=?
m•🔺v
Change in momentum
