basic concepts Flashcards
1
Q
units of mass
A
kg
2
Q
units of weight
A
newton
3
Q
any number to the power 0 is what
A
1
4
Q
25 to the power of 1/2
A
5
same as square root of 25
5
Q
newtons 3rd law
A
to every action there is an equal and opposite reaction
6
Q
density equation
A
mass divided by volume
7
Q
units of density
A
kg m-3
8
Q
mechanical advantage equation
A
effort arm divided by resistance arm
9
Q
2nd class lever - what is in the centre
A
resistance
10
Q
3rd class lever - what is in the centre
A
effort
11
Q
whats the difference between rectangular and polar coordinate systems
A
rectangular - use displacements relative to perpendicular axes
polar - use a displacement and rotations
12
Q
when does density of a material change?
A
it doesn’t, always reminds constant! if mass of an object changes then volume will change proportionally
