Physics Topic 1-5 Flashcards
What are the six energy stores?
Kinetic Potential
Elastic Potential
Gravitational Potential
Thermal Potential
Internal Potential
Chemical Potential
What are the four methods of
transferring energy between stores?
by heating,
by waves,
by electric current,
by a force moving an object.
What is the law of conservation and mass?
Energy can’t be created or destroyed
An object is the amount of energy
transferred to the object by a force acting over a
distance. =?
Work Done
What happens when friction effects work done?
To overcome friction is transferred energy to
the thermal energy stores of the objects that rub
together.
The store of an object increases when it is lifted up because work is done to overcome gravitational force?
Gravitational potential energy store
What determines the gravitational field strength
It depends on the mass of the object.
What is the kinetic energy store?
Is the store of a moving object on it’s mass or speed.
What is the elastic potential store?
When an object is stretched
How will the total energy input into a system be used?
Of the total energy input into a system, a fraction will
be useful and the rest will be wasted.
What happens to the energy that is wasted
in a system?
Wasted energy dissipates to the surroundings which
become warmer.
Why is no machine 100% efficient?
No machine is 100% efficient. Some energy is wasted as heat due to friction between moving parts, air resistance, electrical resistance and noise.
How could we improve efficiency?
Efficiency can be improved by using lubrication on
moving parts, making the machine more aerodynamic,
reducing electrical resistance and noise.
How can insulating materials be
charged?
Rub two insulating materials together
How does an insulator become positively
charged?
An insulator would need to lose electrons through
friction with another object
How does an insulator become
negatively charged?
An insulator would need to gain electrons through
friction with another object
What is electric current?
Electric current is the flow of electrical charges around a circuit. It quantifies how quickly charges are flowing.
What is an ohmic conductor?
A component where the current is proportional to the
the voltage at a constant temperature
What happens to the total resistance in a
parallel circuit?
The total resistance in a parallel circuit is smaller than
the smallest total resistance in one branch of the circuit.
How is potential difference different in
series and parallel circuits?
Potential difference is split between components in a
series circuit. In a parallel circuit each branch of the
circuit has the same potential difference
