Key concepts (topic 1) Flashcards
What is a scalar quantity?
A quantity with only magnitude.
What type of quantity is one that has magnitude and direction?
A vector quantity.
What are the equations for acceleration?
Acceleration(a) = changing speed(v-u)/time taken (s)
What are the units for acceleration?
m/s squared
On a speed time graph, what does a horizontal line represent?
a constant speed
What does the area of the section underneath a speed time diagram?
The total distance travelled
What is the equation for work done?
force x distance
how to work out moment?
force x perpendicular distance to the direction of the force
How to work out he unknown force in a balance board diagram (sea saw with weights either side)
1) label either side of sea saw
2) force 1 + distance 1 = force 2 + distance 2
3) re arrange so force is on its own
How to work out the number of rotations of the gears
driven/driver
e.g. 2/1 = 2:1
What is current measured in?
Amps (A)
What is the amount of substance measure in?
moles (mol)
What is the measure of frequency?
Hertz (Hz)
What is the measure of force?
Newtons
what is the measure of energy?
Joules (J)
What is the measure of power?
Watt (W)
what is the measure of pressure?
Pascal’s (Pa)
What is electrical charge measured in?
coulombs (C)
What is electric potential difference measured in?
Volts (V)
What is electric resistance measured in?
ohm
What is the unit of magnetic flux density?
Tesla (T)
What is the value of nano?
10 [-9]
What is the value of micro?
10[-6]
what is the value of milli?
10[-3]
