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phyc 110 exam 1
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Gravity
Terms in this set (30)
definition of uncertainty
- how "sure" we are about our data
- no measurement is absolutley precise
- equipment/human errors
- always quote the uncertainty
estimated uncertainty sign
Percentage uncertainty
(Absolute uncertainty / measurement) x 100
scalar
A physical quantity that has magnitude only.
examples: distance, speed, mass, temp
vector
A quantity that has magnitude and direction
examples: force, displacement, velocity, acceleration
sin
cos
adjacent/hypotenuse
tan
opposite/adjacent
label triogmetric things
bigger conversion to smaller you....
multiply
smaller conversion to bigger you...
divide
convert 25 kg to g
25,000g
multiply 25 by 1000
convert 40 km/hr to m/s
11.11 m/s
(40 and divide by 3.6)
convert 37 m/s to km/hr
133.2 km/hr
(37 and multiply by 3.6)
110 m to km
.11 km
(divide 110 by 1,000)
22 km to m
22,000 m
(multiply 22 by 1,000)
67 cm to m
.67 m
(divide 67 by 100)
12 m to cm
1200 cm
(multiply 12 by 100)
dimensional analysis
mathematical expressions that relate to different physical quantities. makes use for the fact that dimensions can be treated as algebraic quantities
Time SI unit
seconds (s)
mass
- A measure of how much matter is in an object (quantity to measure the resistance to a change in motion of an object)
- harder to change motion of an object w/ a large mass
length
- measure size of object and how far the objects are from each other
- distance
- height
- displacement
Length SI unit
meter (m)
mass SI unit
kilogram (kg)
displacement
- a distance of an object from its starting location is dependent on the direction
displacement equation
final position - initial position (m)
Velocity
the speed of an object in a particular direction
Velocity formula
v = displacement/time (m/s)
Accerleration
Change in velocity / time taken
Accerleration formula
a = vf-vi/t (m/s^2)
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