4. Notice that the velocity vs time graph shows a linear...

4. Notice that the velocity vs time graph shows a linear relationship. What does this indicate about the motion of the puck? Hint: Specifically, what is the pattern in the rate at which the puck speeds up? 5. How would a velocity vs. time graph look for an object moving in the positive direction, but slowing down instead? For this question, sketch the shape that would occur and insert a picture of the shape into the text box below. Then explain why the velocity graph is drawn the way it is. Hint: Think of how the velocity vs. time graph looks in the case of the puck going down the ramp: the graph is in the positive region and has a positive slope which tells us the object speeds up. How would the graph need to be different to show slowing down?

Transcript

00:01 So you have a question about how to read a velocity time graph.

00:05 So i've created a sketch here of a velocity time graph.

00:10 And my zero velocity is going right through the center here with the red dash line.

00:16 And then my purple is what's happening.

00:19 So i'll highlight this a little bit.

00:23 So the first thing that we have to remember about a velocity time graph is, is that linear relationships, and say acceleration is constant.

00:48 There's a constant force, there's a constant acceleration.

00:52 So we have that in a couple of spots.

00:55 Now, if we have a horizontal line means acceleration is zero, because the slope is zero.

01:09 So that's the main thing to remember, our slope of vt graph is acceleration.

01:19 That's important.

01:20 And if we have a linear relationship on that slope, then it must be constant.

01:29 And then also, if it's a horizontal line, that means there's no net force, the acceleration of zero, the velocity is constant.

01:38 So that's what we have in this scenario.

01:41 We've got a object that's beating up, and it has a positive acceleration.

01:49 And then it reaches the speed, and it just stays at that speed.

01:52 That's when the acceleration is zero.

01:57 And then it begins to slow down, and that tells us that we have a negative velocity here.

02:03 Now, slowing down doesn't mean negative velocity.

02:06 It just means that the force is being applied in the opposite direction as the motion.

02:14 So that's important to remember that just because we have a negative velocity, doesn't mean that we're going to be slowing down.

02:20 And we'll give you an example of that here in a moment.

02:23 Now, what this is telling us right here, let me highlight this with the larger font.

02:31 Let's just walk through the whole thing here.

02:46 So this part here, if we look at that, that is a speeding up at a certain acceleration, at a constant acceleration.

02:57 And then it's reaching in top speed and it's staying at that top speed...

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