Physics 2 - Kinematics
of 17
description
Power point presentation on physics o level syllabus topic on kinematics - includes speed, acceleration, graphs and so on
Transcript of Physics 2 - Kinematics
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1. Distance, time and speed
2. Distance-time graph
3. Speed, velocity and acceleration
4. Speed-time graphs
5. Acceleration of free fall
Kinematics
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SpeedDistance moved per nit time
m!s
Average speedAssmes that o"#ect travels at constant
speed $%&'()%'($
+nstantaneos speedSpeed of o"#ect at particlar instant
)radient of tangent at the particlar point on distance-time graph
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Displacement-time graph*(niform speed
+ndicated "y S$&A+)%$ + graph)radient is niform
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Distance-time graph*on-niform speed
+ndicated "y /(&0 + graph)radient is non-niform, may "e increasing or
decreasing
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Distance-time graph*
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Velocity
/hange in displacement per nit timeDisplacement is the distance in a specied direction
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Also m!s
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Acceleration
/hange in velocity ith time
6ay "e positive or negative
Positive Negative
/hange in velocity samedirection as velocity
/hange in velocity isopposite direction fromvelocity
+ncreasing speed Decreasing speed
Deceleration!retardation
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QUESTINS!
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Velocity-time graph*
(niform acceleration+ndicated "y S$&A+)%$ + graph
)radient is niform7acceleration
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Velocity-time graph*
on-niform acceleration+ndicated "y /(&0 + graph
)radient is non-niform
+nstantaneos acceleration 7 gradient of
tangent at that point on the crve
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Velocity-time graph*
6'S$ +68'&$A$9:::
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"omparison #et$een % graphs
&otion o'o#(ect
Distance-time Speed-time
At rest ;; ;;
(niform speed ;; ;;
(niformacceleration
;; ;;
on-niformacceleration
"
"c
c
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QUESTINS!
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Acceleration o' )ree )all $o Air +esistance
All o"#ects falling nder gravity accelerateat same constant rate
/onstant rate of 1
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?alling ith Air &esistanceAir resistance frictional force hich opposes
motionAir resistance increases ith speed, srface
area and density of air
$erminal velocity@ 6aimm constantvelocity here acceleration is >ero hichoccrs hen air resistance eBals to eight
of o"#ect.
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QUESTINS!
