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Lecture 9

PHY 101 Lecture Notes - Lecture 9: Flickr, Terminal VelocityExam


Department
Physics
Course Code
PHY 101
Professor
Jozwiak
Lecture
9

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Distance (d)
it is the number of metres (m) between two points or the metres travelled by an object
Time (t)
the number of seconds it takes for an event to occur
Acceleration (a)
the rate that speed changes for a moving object, a change in speed : getting faster or slower (ms-2)
-is an increase in speed in a certain time
-can be calculated by dividing the change in speed by the change in time, a=v/t
Deceleration
a word used for 'slowing down' or 'negative acceleration' (-ms-2)
-when describing in word answer NEVER say 'it is decelerating at -10m/s2
-deceleration:write using positive value eg- decelerating at 10m/s2
-deceleration with a negative value: eg- accelerating at -10m/s2
Mass (m)
the quantity of matter in an object measured in kilograms (kg)
Weight force
is a force measured in Newtons and it is the force due to gravity. Fw=mg
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Work (w)
is the energy transferred from one form to another and is work is done whenever an object moves in
the direction of the force that is being applied to it, measured in joules (J)
-If you are carrying something "along" there are NO forces acting on it in the direction of motion (no
change in speed so no change in energy) so no work is done.
Power (P)
the rate at which work is being done measured in Watts (W)
-work done per second
-A more powerful person/thing does more work in the same time or the same work in less time
Pressure (P)
pressure depends on the amount of force used and how big an area of force is spread over or force
applied to a certain area measured in (Nm-2) or Pascals (Pa)
-is force per unit area
-To turn cm2 into m2 divide by 10,000 (100 x 100) 10^-3
Force (F)
a push or pull measured in Newtons (N)
something that can make an object either speed up, slow down, stop, changes its direction or shape, to
work out F=ma
Gravity
is a force that attracts objects towards the centre of the earth, g=10Nkg-1
How to solve physics problems?
-read question carefully
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-write equation/formula
-substitute in numbers
-rearrange
-calculate
-correct unit ( make sure to make any conversions if needed)
Stationary
if something is not moving, it is said to be stopped or stationary
What is the symbol for change in?
TRIANGLE
Constant Speed
if a object is moving at a 'constant speed' then it is covering equal distances in equal time
Average Speed
total distance travelled / total time taken
Distance/Time Graphs
-distance an object has moved at different times can be plotted on this graph
-vertical axis (y) is used for distance
-horizontal axis (x) is used for time
-size of slope (gradient) of the graph gives the velocity/speed
-flat sections are where object has stopped
-the greater the slope the greater the speed.
-curves represent acceleration or deceleration
-steep curve means it's speeding up
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