Energy,Forces,Constant Velocity, Acceleration

Eg formula

mgh

g=

10N/kg

Ek formula

(1/2)(m)(v)²

J=

Joules

Work

Energy that is added or taken away from the system

Work formula

F*change in position(displacement)

Ek

Kinetic energy

Eg

Gravitational potential energy

Eel

Elastic Potential Energy

Ediss

Dissipated energy(friction)

Kinetic energy

The energy of moving objects

Gravitational potential energy(Potential)

The energy of an object due to its position(height)

Potential energy…

has the potential to turn into kinetic energy

Eel

The energy of objects that are stretched or compressed and will return back to its original shape when the force is removed.

Ediss

A group of energies that build up and spread out throughout the system due to friction/drag or collisions.(Ediss never decreases once it shows up, it’ll either stay the same or increase)

Fw

Gravity

Ft

tension(Ropes)

Fd

Air resistance

Ff

Friction

Fn

Normal(supporting)

Fa

Applied(push or pull)

Newtons 3rd Law

For every force there is an equal and opposite force

Force pairs

They happen on different objects and are equal in magnitude in opposite directions.

Newtons 2nd Law

The acceleration of an object depends on both Net force and mass.

Net force

The sum of all forces acting on an object.

Net force has two parts:

Direction and Magnitude.

Formula for Net Force is…

Fnet=M*A

The formula for acceleration is…

A=Fnet/M

The formula for mass is…

M=Fnet/A

System schemas…

List all the objects in a system and represents their interactions.

formula for finding the velocity

change in position/change in time

displacement

change in position

formula for displacement

Xf-Xi

Xf

final position

Xi

initial(starting) position

To find velocity on a graph…

find the slope of the line.

Displacement is…

distance from the starting position

steeper line=

the faster the object is going

shallower line=

the slower the object is going.

on a motion map, going towards 0 means…

the object is going in the negative direction.

on a motion map, going away from 0 means…

the object is going in the positive direction.

the longer the arrows are on a motion map…

the faster the object is going.

the shorter the arrows are on a motion map…

the slower the object is going.

dots on a motion map=

time

on a velocity vs time graph, lines are…

horizontal

The further the line is from 0…

the faster it’s going.

A horizontal line along the x-axis means…

the object is stopped.

Acceleration is…

any change in velocity

Speeding up in the positive direction on a position v time graph…

the line goes up and gets steeper over time

Slowing down in the positive direction on a position v time graph…

the line goes up and gets shallower over time

Speeding up in the negative direction on a position v time graph…

Line goes down and gets steeper over time

Slowing down in the negative direction on a position v time graph…

line goes down and gets shallower over time

Speeding up in the positive direction on a velocity v time graph…

above zero and goes away from zero

slowing down in the positive direction on a velocity v time graph…

above zero and goes towards zero

Speeding up in the negative direction on a velocity v time graph…

below zero and going farther from zero

slowing down in the negative direction on a velocity v time graph

below zero and going closer to zero

The SIGN(+ or -) of the slope on a velocity v time graph…

represents the direction of the acceleration.

Speeding up on a motion map in the positive direction…

vectors get longer going to the right

Slowing down on a motion map in the positive direction…

vectors get shorter going to the right

Speeding up on a motion map in the negative direction…

vectors get longer going to the left

Slowing down on a motion map in the negative direction…

vectors get shorter going to the left

Sign of the acceleration(← or →) when speeding up…

same as the direction of the motion

Sign of the acceleration(← or →) when slowing down…

opposite as the direction of motion

Units of acceleration are…

m/s/s or m/s²

formula for finding acceleration…

change in velocity /change in time(Vfinal-Vinital/change in time)