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# velocity and motion

1. Select the quantity that has changed--velocity or speed-- for a car that travels north at 88 km/h and then turns east while continuing to move at 88km/h.

2. Infer how distance and speed in the motions of clock parts are used to measure time.

3. How can you use a speedometer and a clock to tell how far you've traveled in a car if the car's odometer is not working.

4. Apply the concept of momentum to compare a slow-moving train and a high-speed bullet.

5. Indicate which of the following has greater momentum: a 500 kg car moving at 64km/h, a 250 kg cart moving at 128 km/h, or a 1000 kg truck moving at 32 km/h.

6. Infer what you can say about the velocity of a car that is moving with a constant momentum.

#### Solution Preview

Please see the attached file for detailed solution.
1. The velocity has changed when the car turned east.
Speed is a scalar variable. In both cases, the speeds are the same at 88 km /h.
However, the velocity is a vector including magnitude and direction. Although the magnitude (88 km/h) remained the same, the direction changed from north to east. Therefore, the velocity has changed.

3. ...

#### Solution Summary

The solution explains the parameters of the motion of an object, such as velocity, time, speed, and momentum, etc.

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