Physics Video Clips

Physics video clip 01 ball rolls down level ramp, questions: const vel? how to measure? shape of graph?

• A ball rolls down a straight inclined ramp. It is the velocity the ball constant? Is the velocity increasing? Is the velocity decreasing?
• If the ball had a speedometer we could tell. What could we measure to determine whether the velocity of the ball is increase or decreasing?
• What is the shape of the velocity vs. clock time graph for the motion of the ball?

Physics video clip 02 ball rolls down curved-end ramp, same questions const vel? how to measure? shape of graph?

• A ball rolls down ramp which curves upward at the starting end and otherwise rests on a level table. Answer the same questions is on the preceding video clip.

Physics video clip 03 v vs. t graph: certainly increasing, but at const, incr or decr rate?

• For the ball on the straight inclined, we would certainly agree that the ball's velocity is increasing. Is the velocity increasing the constant, and increasing, or decreasing rate? What is the graph of velocity vs. clock time look like?

Physics video clip 04 increase from graph: note `dt and `dv

• Given a graph of velocity vs. time how do we determine the rate which velocity increases?

Physics video clip 05 calculate ave. rate of change

• If we know the velocities at two given clock times how do we calculate the average rate of which the velocities changing during that time interval?

Physics video clip 06 speedometer example: rate at which speedometer moves

• Does the rate which is speedometer needle moves tell us how fast the vehicle is moving?
• Does a stationary speedometer needle implies stationary vehicle?
• Does quickly moving speedometer needle imply a quickly moving vehicle?
• What does it feel like insider car when the speedometer needle is moving fast?
• What does the speed of the speedometer needle tell us?

Physics video clip 07 slope triangle, instantaneous acceleration, tangent line

• How do we represent the calculation of the rate which velocity changes on graph of velocity vs. time?
• If we know the velocity at every clock time, that how we find the precise rate at which velocity changes adding given clock time?
• How do we depict the instantaneous rate of velocity change on a graph of velocity vs. time?

Physics video clip 08 finding displacement: define displacement, then calculate by common sense, by formula, by area

• What is the difference between displacement and distance?
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In how many different ways can we represent the calculation of the displacement over a constant-acceleration time interval?

• How do we calculate displacement from velocity and time interval?  What is the common sense of this calculation?
• How do we use a graph to help visualize the calculation of displacement when velocity is constant?
• What aspect of a v vs. t graph tells us the displacement?

Physics video clip 09 displacement for linear v vs. t graph: common sense, formula, area

• If we know the initial and final velocities over some time interval, and if the rate which velocity changes is constant, then how do we calculate the displacement over a the time interval?
• If we know the initial and final velocities over some time interval, and if rate which velocity changes is constant, then how do we calculate the displacement of the object during that time interval?

Physics video clip 10 continuing 09: calculation of area

• How do we use a graph of v vs. t to depict the calculation of the displacement over a time interval?
• What aspect of the graph gives the displacement during the time interval?

Physics video clip 11 `ds on single time interval: ave. ht * width = vAve * `dt = `ds

• How do we calculate the displacement during a single specific time interval, given a linear v vs. t graph?
• If we know the initial and final velocities over some time interval, and if the rate at which velocity changes is constant, then how do we calculate the displacement of the object during that time interval?
• In how many different ways can we represent the calculation of the displacement over a constant-acceleration time interval?

Physics video clip 12 continuing ph11

• How does the graphical calculation connect with our common sense about velocity, displacement and time?

Physics video clip 13 repeat for all trapezoids under curve / all short time intervals from t0 to tf

• If we know the initial and final velocities over some time interval, and if the rate which velocity changes is constant, then how do we calculate the displacements over a series of time subintervals?

Physics video clip 14 emphasize adding displacements, mention accumulated area

• Having calculated displacements over all specified subintervals, how do we obtain the total distance moved from the initial clock time up through the end of each subinterval?
• How do we construct a position vs. time graph from a velocity vs. time graph?

Physics video clip 15 show generally what we get from a trapezoid, emphasize how trapezoid tells us when to add and

• How do we symbolically and graphically represent the calculation of the displacement corresponding to a given initial and final velocity over a given time interval?
• How do we know when to subtract and when to add the initial in final velocities in calculating average rates of velocity change and displacements from initial and final velocities and time interval?

Physics video clip 16 Experiment 1: Find the average velocity of a ball rolling from rest down a straight inclined ramp; infer initial velocity and final velocity, then infer acceleration. Use the program TIMER (on CD, or ask instructor to E-mail) and a measuring device (e.g., tape measure, ruler, meterstick).