Energy
What is Energy
Energy is the quantity that enables an object to do work on another object.
Give three examples of an energy store.
Examples could be gas, petrol, diesel, sugar...
What happens in a 1D collision between two balls with equal mass (isolated)?
The velocity of both balls is switched.
What is the law of Conservation of Energy
And why is it important
Energy can neither be created nor destroyed; it can only be transferred from one store to another.
If it were not true, your water bottle could fly off your desk without anyone pushing it.
Where does the lost energy of a car engine go?
It changes into kinetic energy for the particles of the car and air and is lost doing work against the friction in an engine.
What happens during a perfectly inelastic collision?
The energy is not conserved as there is work done to squash the two objects as in a perfectly inelastic collision the objects coalesce.
What is kinetic Energy and its Equation?
Kinetic energy is the energy a body has due to its movement. (Ek = 1/2mv2)
Explain what a Sankey Diagram is.
It is a diagram that is used to show the energy loss that happens during energy transfer.
What happens in a 2D collision between two balls with equal mass (isolated)?
Their trajectories will form a right angle.
What is Grav. Potential Energy and its equation?
Grav. Potential Energy is the energy a body has because of its position above the Earth. (Ep = mgh)
Give the Efficiency formula and find out the efficiency of a car that is filled with 1 liter of petrol the has 36MJ/L and that is able to put out 15MJ of useful work with this.
Eff=useful work out/total energy in (x100)
41.6%
Which part of an object that breaks in two gets the most Kinetic energy?
The smallest piece.