Physics Flashcards
Describe speed?
speed is rate of a change in distance.
What is the equation for speed?
Speed = Distance/time
Define acceleration?
Acceleration is the rate of change in speed.
What is the equation for acceleration?
a = v-u/t
acceleration= final speed - initial speed/ time taken
Define deacceleration?
Deacceleration is the term used to describe when an object slows down.
If an acceleration is negative, what does this tell you?
That the object is deaccelerating
What are the units for acceleration
M/s*2
mass x acceleration =
Force
What is velocity?
When something moves in a particular direction
Define a magnetic field
the region around a magnet, where a pull force is in use.
How can you show a magnetic field?
- the magnetic field shape can be shown by drawing the field lines: to do this you can use iron fillings.
What happens when an insulating material is charged negatively?
The material gains electrons
What happens when an insulating material is charged positively?
The material loses electrons
Describe a solenoid?
A solenoid consists of a wire coiled up
How can you tell which direction a current is flowing in a wire?
The right hand grip rule
Nam three ways you can vary the strength of a electromagnet?
- Adding more coils to the solenoid
- Adding more turns to the coils
- Increasing the current.
Define a electromagnet
an electromagnet is a solenoid wrapped around an iron core.
Name 3 uses of electromagnets?
- scrapyard crane
- Electric bell
- loud speakers
- microphones
_____ is the capacity to do work
Energy
Work done = ____ ________
Energy transferred
Describe power?
power is the rate of energy
What is the equation of power?
Power = Energy transferred/ time taken
What is the equation of kinetic energy?
0.5 x mass x speed *2
Using the GPE equation, how would you figure out HEIGHT?
H = GPE/mass x gravity
As a pendulum swings when is it the fastest?
When it is at the lowest point
What is being described here?
‘chemical store, which releases energy when it is burned’
Fuel
what is the energy store used for chemical substances?
Chemical energy
