Energy Of Motion Flashcards
(20 cards)
What does work Done equal
Energy transferred
Define work done
Equal to the amount of energy transferred, when an applied force, moves an object over a distance.
Work Done equation
Work done = force (times) distance
(N/M) or ( J ) = (N) times (M)
Define GPE (gravitational potential energy)
Energy stored in lifted objects
Gravitational potential energy (GPE) Equation
GPE = Mass (times) gravitational field strength (times) height
( J ) = (KG) times (N/Kg) times (M)
Is Gravitational potential energy a stored energy?
YES
Define Kinetic energy
Stored energy in a moving object
The equation for kinetic energy
KE = 1/2 mass (times) velocity squared
Mass = 2KE / velocity squared
Velocity = (square root) of 2KE / mass
KE = ( J )
Mass = ( KG )
Velocity ( m/s )
Law of conservation of energy definition
- energy is neither created nor lost/used up
- it only transferred from one form to another
This is assuming no energy is lost
- thermal energy (no friction)
- sound
Is kinetic energy a stored energy
Yes
Does KE equal GPE
Yes
Define power
The rate of energy transferred
What is the equation for power
Power = energy transferred / time
(W) = ( J ) / ( s )
Or
Power = work done / time
Because
Work done = energy transferred
What two components equal stopping distance
Thinking distance + braking distance
What 5 aspects may affect thinking distance
- drugs
- alcohol
- distraction
- medication
- emotional / metal state
What 4 things affect braking distance
- Road : friction (wether it is raining or icy)
- car : tyres, brake pads
- speed
- weather
What equation is used to calculate speed
Speed = distance / time
What equation is used to calculate reaction time
Reaction time = distance / speed
How to find the thinking distance and braking distance on a graph
Area under the graph
On a graph what does a flat line represent
The thinking distance (if it is on this topic)
The downwards line is the braking distance (if it is on this topic)
