Ch 4 Flashcards
speed
- how far something will move in a certain amount of time
- has magnitude
universal law of gravitation
every mass attracts each other
attraction is directly proportional to product of masses
attraction is inversely proportional to the square of the distance
newton’s 1st law
objects will continue to rest or move in the same speed and direction unless acted upon by a net force
newton’s 2nd law
relates force, mass, and acceleration
F = ma
newton’s 3rd law
with a force there is an equal and opposite force
velocity
- speed and direction
- vector with magnitude and direction
acceleration
- rate of change in velocity
- acceleration of gravity 9.8 m/s2
momentum
- p = mv
- product of mass and velocity
- applying force is the only way to change momentum of an object
force
- F = ma
- force = mass x acceleration
angular momentum
- momentum that is related to rotation or revolution
- L = mvr mass x velocity x radius
mass vs weight
- mass is the amount of matter in something that takes up space
- weight is the amount of force acting on the mass
law of conservation of energy
energy cannot be created nor destroyed
law of conservation of momentum
as long as there are no external forces the total momentum of interacting objects do not change
law of conservation of angular momentum
as long as there is no external torque then the total angular momentum of interactin objects cannot change
thermal energy
thermal energy is the total kinetic energy of the system while temperature is the average kinetic energy of the particles
radiative energy
energy carried by light
kinetic energy
- energy of motion
- 1/2mv2 = KE
potential energy
- PE is energy stored that can be converted
- PE = mgh mass x 9.8m/s2 x height
tides
- 2 high tides and 2 low tides
- low tides happen at moonrise and set
- 12 hours in between
- spring tides - new and full moon strongest
- neap tides - 1st and third quarter weakest
