Physics Flashcards
What is the word equation for Weight?
Weight = Mass x Gravitational field strength
What is the symbol equation for Weight?
W = m x g
What is the word equation to calculate work done?
Work done = force x distance
What is the symbol equation for work done?
W = F x s
What is the word equation for force applied to a spring?
Force applied to spring = spring constant x extension
What is the word equation for distance
Distance = speed x time
What is the word equation for accelerating
Acceleration = change in velocity/time taken
What is the symbol equation for acceleration
a = (v-u)/t
What is the word equation for resultant force
Resultant force = mass x acceleration
What is the symbol equation for resultant force
F = m x a
What is the word equation for momentum
Momentum = mass x velocity
What is the symbol equation for momentum
P = m x v
What is the word equation for kinetic energy
Kinetic energy = 1/2 x mass x (velocity)squared
What symbol equation for kinetic energy
Ek = 1/2 x m x (v)squared
What is the word equation for gravitational potential energy
Gravitational potential energy = mass x gravitational field strength x height
What is the symbol equation for gravitational potential energy
Ep = m x g x h
What is the word equation for power in terms of energy
Power = energy transferred/time
What is the symbol equation for power in terms of energy
P = e/t
What is the word equation for power in terms of work done
Power = work done/time
What is the symbol equation for power in terms of work done
P = W/t
What is the word equation for efficiency in terms of energy
Efficiency = useful output energy transfer/total input energy transfer
What is the word equation for efficiency in terms of power
efficiency = useful power output/total power input
What is the word equation for wave speed
Wave speed = frequency x wavelength
What is the Symbol equation for wave length
V = f x λ
What is the word equation for potential difference
Potential difference = current x resistance
What is the Symbol equation for potential difference
V = I x R
What is the word equation for power in terms of potential difference
Power = potential difference x current
What is the symbol equation for power in terms of potential difference
P = V x I
What is the word equation for power in terms of current
Power = (current)squared x resistance
What is the symbol equation for power in terms of current
P = I squared x R
What is the word equation for energy transferred
Energy transferred = charge flow x potential difference
What is the symbol equation for energy transferred
E = P x t
What is the word equation for energy transferred in terms of charge flow
Energy transferred = charge flow x potential difference
What is the symbol equation for energy transferred in terms of charge flow
E = Q x V
What is the word equation for density
Density = mass/volume
What is the symbol equation for density
P = m/v
What are the four magnetic metals?
Iron, nickel, steel, and cobalt
Describe the magnetic field inside a solenoid
Strong and Uniform
How can we use a compass to plot the pattern of the magnetic field lines around a magnet
Place plotting compass near the magnet on a piece of paper. Mark the direction the compass needle points. Move the plotting compass to many different positions in the magnetic field, marking the needle direction each time. Join the points to show the field lines
What is the effect called that causes a force to be exerted on a current-carrying wire when it is placed within a magnetic field
The motor effect
What is a permanent magnet?
A permanent magnet is one that produces its own magnetic field
What kind of magnet has the same magnetic field as the long coil of wire
A bar magnet
What direction do magnetic field lines go in
North to south
What is an induced magnet?
An induced magnet becomes a magnet in a magnetic field
Is magnetism a contact or non-contact force
Non-contact
What is a magnetic compass made off? What direction does it point in?
It is a small magnet and it points north
How does an electric motor work
A coil of wire carrying a current in a magnetic field experiences a force that makes it rotate. A split ring commutator changes the current direction every half turn
What happens to the strength of a magnetic field the further you go away from the magnet?
It weakens
What is the main advantage of using an electromagnet vs a permanent magnet
It can be turned of and on
What rule can we use to draw the magnetic pattern of a magnetic field pattern for a straight wire?
The right-hand rule
Like poles , unlike poles .
Like poles repel, unlike poles repel
What do the fingers stand for in Flemings’ left-hand rule?
FBI (Direction of Force, Direction of Magnetic Field(N to S), Direction of current(+ to -)
Name 3 ways that we can make an electromagnet stronger.
You can increase the turns in the coil, add iron core, increase the current.
What is the difference between a contact and a non-contact force?
Contact forces need to touch, non contact do not
What causes a wire to produce a magnetic field
Electric current
What is the equation for the force of a current-carrying a wire
F = B x l x l (Force = Magnetic flux density x current x length of wire)
Where is the field of a bar magnet strongest
the poles
What is the scientific name for a long coil of wire
A solenoid
