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Kinematics (Stuff moving) (stuff). Daddy Definitions.

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Presentation on theme: "Kinematics (Stuff moving) (stuff). Daddy Definitions."— Presentation transcript:

1 Kinematics (Stuff moving) (stuff)

2 Daddy

3 Definitions

4 Mommy Notice no time in this one!

5 One more! v t Avg velocity

6 Tips for deciphering word problems …at rest, …from rest – not moving at beginning… v 0 = zero!..comes to rest… v f =zero …Travels 10 m in 10 sec… –x f =10m,  t=10 s …reaches a maximum height – velocity at h max = zero!

7 The Equations!

8 Kinematics Examples Drag race –Avg velocity given time and disp –Avg acceleration given final v and disp Motion Graphing –Aircraft Catapult Draw position and acceleration given velocity

9 Drag Race 1. A car travels meters in sec. What is its average velocity? 2. The same car reached m/s at the end of the first meters. What was its average acceleration?

10 Drag Race #1 Unknown: Given: Principle: Equation: Picture: Simplify/Solve/Substitute

11 Drag Race #2 Unknown: Given: Principle: Equation: Picture: Simplify/Solve/Substitute

12 Aircraft catapult Navy aircraft are launched from the decks of aircraft carriers with a steam powered catapult. The graph shows the velocity of the aircraft as a function of time. Analyze the graph and draw corresponding position and acceleration graphs.

13 Aircraft Catapult(v) 50 v(m/s) time(s) 5

14 Aircraft Catapult(a) 20 a(m/s 2 ) time(s) 5

15 Aircraft Catapult(x) x(m) time(s)

16 Freefall Same kinematics equations… Just constant acceleration of a=g=9.8 m/s 2 toward mother earth.

17 1) A ball is dropped from 10 meters high. How fast is it going when it hits the ground? 2) How long does it take to reach the ground? Freefall Example

18 3) A ball is given an upward velocity of 5.0 m/s, what is the maximum height it will reach? 4) How long does it take to reach this max height? Freefall Example

19 5) A ball is thrown upward with a velocity of 4.0 m/s. How fast is it going when it hits the ground, 10 meters below where it was thrown from? Freefall Example

20 Freefall Cases Downy –Dropping or “spiking” Uppy –Toss up Uppy – downy –Toss up off a ledge, object lands lower than the ledge Establish your coordinate system and be consistent with signs.

21 Wrap up Givens Unknowns P&P E –Time or none given S & S & S

22 The Equations!

23 5) A ball is thrown upward with a velocity of 4.0 m/s. How fast is it going when it hits the ground, 10 meters below where it was thrown from? Freefall Example

24 Freefall Cases Downy –Dropping or “spiking” Uppy –Toss up Uppy – downy –Toss up off a ledge, object lands lower than the ledge Establish your coordinate system and be consistent with signs.


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