Flashcards for AQA A level Physics Unit 4
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Define: conservation of momentum
Define: elastic collision
How are force and momentum related?
What is meant by 'impulse'?
Define the term 'radian'
Define: angular speed
Give 3 factors that affect centripetal force
What conditions must be satisfied for an object to be in SHM?
Energy in SHM is the interchange between which two energy forms
How is the oscillations of a simple pendulum and a mass-spring system affected if taken to the Moon?
What is a free vibration?
What is a forced vibration?
What happens when a system is driven at its natural frequency?
What is damping?
What is critical damping?
State Newton's gravitational law
What do gravitational field lines show?
Describe in one word the gravitational field around a planet
What is an equipotential?
Define: gravitational field strength
Define: gravitational potential
Why is gravitational potential a negative value?
What is the gradient of a gravitational potential vs. distance graph equal to?
Define: electric field strength
What is the unit for electric field strength?
What is the unit for gravitational field strength?
Define: electric potential
How do you find the electric potential difference between two points in an electric field?
What is the unit for electric potential difference?
What is the electric field strength equal to in a uniform field?
What is the force F on a charge q equal to in an electric field of field strength E?
Describe the motion of a charged particle entering a uniform electric field perpendicular to the field lines
Give one difference between electric and gravitational fields
Define capacitance
Define the Farad, F
What does the area under of a graph of Q against V represent?
What does the gradient of a graph of Q against V represent?
What is the time constant of a capacitor equal to?
After how many time constants is a capacitor considered to be charged or discharged?
Define: magnetic flux density
Fleming's left hand rule:
State what the 3 fingers represent
Fleming's right hand rule:
State what the 3 fingers represent
Why does a particle moving in a circular path not spiral inwards?
State Lenz's law
Define: magnetic flux and state the unit
Define: magnetic flux linkage and state the unit
How is the induced EMF and the flux linkage related?
Describe how a p.d. is induced across the secondary coil of a transformer
Describe how the efficiency of a transformer is maximised.
Why is electricity transmitted at high potential differences?
