In which of these situation is the speed constant but the velocity is changing
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In which of these situation is the speed constant but the velocity is changing

[From: ] [author: ] [Date: 12-04-30] [Hit: ]
5. Dropping a stone from a building.6. Walking up an escalator.7. Motion of a door being closed at a constant rate.......
1. Motion of blades of a windmill at constant wind.
2. Driving at 30 mph around a bend.
3. Accelerating along a straight line.
4. Moving at constant speed along a straight line.
5. Dropping a stone from a building.
6. Walking up an escalator.
7. Motion of a door being closed at a constant rate.
Into to physics help please. I am willing to learn and will give you your best answer points really quick.

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Velocity is speed with direction, if either the speed or direction ( or both) changes then the velocity changes. So velocity changes in:

1) Speed is constant, direction continually changing.

2) Speed is constant, direction continually changing.

7) A door on hinges (rather than a sliding door) would be moving in an arc at constant speed so the direction is changing as it moves.

Velocity is not changing in 4) speed and direction is constant. Also in 6) speed is only added (or subtracted if you're going the opposite way) but it is constant and the escalator is not changing direction.

3) Speed is changing, direction is constant.
5) Speed is changing, direction is constant.

Edit: tidied up, 1) 2) and 7) are the answers, the rest are explanations.

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When the speed is constant but the velocity is changing means that the velocity has the same magnitude but it is changing directions.
So let's look for choices that involve that.

1. Yes. The blades are rotating at constant speed from the wind, but they are constantly changing directions.
2. Yes. Turning the bend is the direction change.
3. No. There is no direction change.
4. No. When you are moving straight, your velocity is constant.
5. No. The stone will move in a straight path.
6. No. Even though there is an angle, you are still going straight up at that angle.
7. Yes. The "turning" or torque is the change in direction.
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