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Forces By: Alyssa Zhao #530 (Work (Pushing parallel to the ground …
Forces
By: Alyssa Zhao #530
Newton's Laws of Motion
2
The acceleration of an object is equal to the net force acting on it divided by the object's mass.
Acceleration= Net Force/Mass, or a=F/m
Example:
You can try to find the acceleration of the bottle rocket when launched by dividing the mass by the net force.
3
For every action, there is an equal and opposite reaction.
Example:
When the parachute on the bottle rocket opens from the air coming towards the rocket, the rocket will suddenly slow down due to the air that's under the parachute.
1
An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Example:
Our bottle rocket won't move until the pressure escapes. The rocket is at rest until the pressure from the pumping pushes it up.
Work
Pushing parallel to the ground
Work=Net force x Displacement
or W=Fd
Pushing not parallel to the ground
W=Fd cos θ
No Work
Action done on an object that displaces the object
Energy
Potential Energy
Energy of Posistion
The energy an object possesses by virtue of its position in a field
(Gravitational, electromagnetic, etc.)
Potential Energy=mass x free fall x height
OR
P.E. = mgh
Kinetic Energy
Energy of Motion
The energy an object possesses by virtue of its motion
Kinetic Energy of an object=
1/2 mass of object x speed of object ^2
OR
K.E. = 1/2 m v^2
Mechanical Energy
Mechanical=Kinetic+Potential
OR
K.E.+P.E.=M.E.
Sum of Kinetic Energy and Potential Energy associated with the motion and position of an object.
