CH7 LAWS OF MOTION
What is Inertia?
An object at rest stays at rest an object in motion stays in motion unless acted upon by an outside source
Law number 1
Centripetal Force keeps a body moving in a circular path by
pulling the object towards the center of the circle
a transfer of energy
an applied force causes displacement
height from earths surface. PE= mgh
weight
What is newtons 2nd Law?
Force is equal to mass times acceleration F=ma
Law of acceleration
Centrifugal force is called a false force why?
an object accelerating along the tangential line is explained by inertia
a force pushing out from the center is false
A child pulls a duffel bag by the strap for 1 meter. What formula would you use to calculate work?
W=fd cos (theta)
Kinetic energy is associated with
motion KE=1/2mv^2
Mass
kg
What is the law of Action-Reaction?
for every action there is an equal and opposite reaction
Law number 3
what did newton predict about artificial satellites?
the escape velocity, velocity to put a satellite in orbit
In an ideal machine what force is not considered?
friction
Mechanical Energy is
the combination of potential and kinetic energy
Work
Joules J
What is the normal force of a 10kg mass that is stationary?
normal force = weight
w=mg w= 10(9.8) 98N
What does G represent? Who founded it?
universal gravity 6.67 x 10^-11
Newton theorized Henry Cavendish proved
the rate at which work is done?
power
heat
transfer of energy due to temperature change
Power
Watts W
Energy is neither created nor destroyed only transformed, the amount of energy in the universe is constant
This concept is known as
Law of Conservation of Energy
Weightlessness is felt when what force is absent?
Normal force, CONTACT FORCE
the work input into a machine that is returned as useful output is known as
efficiency
How does energy flow between object of differing temperatures?
energy is transferred from the hotter object to the colder object
kg*m/s