Discussion How can you determine if the motion graphs for your scene are physically accurate? How would the scene look different if it were accurate?

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Presentation transcript:

Discussion How can you determine if the motion graphs for your scene are physically accurate? How would the scene look different if it were accurate?

Kinematic Equations of Motion v = v o + at x = x o + v o t + 1/2 at 2 v 2 = v o 2 + 2a(∆x) Basic equations of motion – used in most kinematics problems. Last equation useful for problems where time is not known. You may need to use a combination of these equations to solve the problem. Where did these come from?

A Guide to Solving Problems 0. Read the question 1. Draw a picture. 2. ID what you are being asked to solve for. 3. ID the known info (known info is not always stated, like the value of gravity) and related equations. 4. Solve, showing your work. Start with general equations, do algebra first, plug in numbers last. 5. Clearly indicate final answer and check your units.

Practice problem #1 A squirrel starts from rest and accelerates at 7.40 m/s 2. How far has it traveled in 2.00 sec? a = 7.4 m/s 2 t = 2.00 s = 14.8 m

Practice Problem #2: A slow car moving in a straight line with an initial velocity of 0.50 m/s accelerates at 2.0 m/s 2 for 2.0 seconds, coasts with zero acceleration for 3.0 seconds, and then accelerates at -1.5 m/s 2 for 1.0 second. What is the final velocity of the car? v o = 0.5 m/s a 1 = 2.0 m/s 2 Δt = 2.00 s v f = v o + a 1 t = (2)(2) = 4.5 m/s v o = 4.5 m/s a 2 = m/s 2 Δt = 1.00 s v f = v o + a 2 t = (- 1.5)(1) = 3 m/s

Practice Problem #3 A truck falls off a cliff. If the cliff is 33.5 m high, how much time for the truck to reach the bottom?

Practice Problem #4 You toss a baby straight up in the air, it goes up, comes down, and you catch it. If it took 0.6 s from when you threw it to when you caught it, how high did it go (again, the acceleration due to gravity, g, is 9.8m/s 2) ?