Chapter 1 - Physics Flashcards
How can energy be stored and what ways is it transferred?
Energy can be stored in different ways
It can be transferred through things like heating, waves, an electric current, or when a force moves an object.
What happens when an object falls and gains speed?
It’s store of gravitational potential energy decreases and it’s kinetic energy store increases.
What is the principle of the conservation of energy?
Energy cannot be created or destroyed
What is a closed system?
A closed system is a system when in which no energy transfers take place out of or into the energy stores of the system
What is the work done equation?
Work done (J, Joules) = Force applied (N, Newtons) x distance moved along the line of action of the force (metres, m)
Examples of friction in work are?
If you rub your hands vigorously, they become warm
What is the change in object’s gravitational potential energy store?
Change in object’s gravitational potential energy store (Joules, J) = Weight (Newtons, N) X Change of height (metres, m)
When does the gravitational potential energy store of an object increase?
When it moves up because work is done on it to to overcome the gravitational force and also decreases when it goes down.
What does the energy in the kinetic energy store of a moving object depend on?
It depends on it’s mass and it’s speed
What is elastic potential energy?
It is the energy stored in an elastic object when work is done on the object
What is useful energy?
It is energy transferred to where it is wanted in the way that it is wanted
What is wasted energy?
It is energy that is not usefully transferred
What does dissipated mean?
The energy spreads out
Dissipated is described as what type of energy?
It is described as waste energy because it’s not transferred as useful energy.
Where does wasted energy get spread out to?
It is eventually transferred into the surroundings, which become warmer.
