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Forces and energy Edmund Chao 504 p5 Ebanez (Newton's First Law…
Forces and energy
Edmund Chao 504 p5 Ebanez
Newton's First Law
Things will stay at rest or uniformly move in a straight line...
unless an external force acts upon it.
(the words are fn, fg,f friction, and fa from the top right clockwise)
(v≠0m/s) a=0 m/s^2
it will stay in motion at the same acceleration
unless an unbalanced force acts on it
(the words are fn and fg from the top to bottom)
(v=0m/s) a=0 m/s^2
This connects to the water rocket because
the rocket will stay on the stand unless an
unbalanced force acts on it. The air presssure
will force the water which helps propel the rocket.
Newton's Second Law
A force is defined to be equal to the change in momentum to change in time.
A=ΣF/m OR F=ma
:
(the words are ΣF=N15-N10, FN, N15, FG, and N10 from the top left clockwise)
The movement is 5N going left.
Heavier things require more force to move
(the words are N1000 and Mass:100 kg)
The 100 kg takes N1000 to move.
than light things
This can be applied to the rocket because you can use
the equation to find the vertical and horizontal acceleration.
For example, you plug in the forces and mass and simplify to find the acceleration.
Newton's Third Law
When a force is exerted on an object an equal and opposite force has to be exerted on it.
(the words are N15)
The force exerted on the box by the person is the same magnitude as the force exerted on the person by the box.
Gravity exerts a downward force on you standing up.
You exert an upward force on gravity
This can be applied to the water bottle rocket because if the water in the rocket propels the rocket and exerts an upward force of 100 N against gravity, gravity will exert a downward force of 100 N on the rocket.
Fab=-Fab
Energy
Kinetic Energy
Energy because of motion
The energy transformed to an object.
can be transformed into other kinds of energy
Potential Energy
PE=mgh
Stored energy that depends
on the relative
position of parts of the system.
Mechanical Energy
Energy of motion (kinetic energy) plus
stored energy of position (potential energy)
that is used to do work
A Hammer striking something is an example of mechanical energy.
work
SI unit for work: Joule
1 J= 1 N over 1 meter
When force is exerted horizontally.
W=F*D
When force is exerted at an angle.
W=F
D
cos(theta)
Work-Energy Theorem
Wnet=change in kinetic energy
When 10 joules of work are exerted on the object, it moves with 10 joules of kinetic energy.
Action on on object that
displaces another object
The circle that is in motion displaces the square.
