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1. Does the speedometer of a car read average speed or instantaneous speed? How do you know?



2. If the speedometer of your car reads a constant speed of 40km/hr, can you say 100% for sure that the car has a constant velocity? Explain your answer.



3. What two controls on a car cause a change in speed?



4. What control causes a change in velocity?



5. What is the acceleration of a car that travels in a straight line at a constant speed?



6. Describe a situation in which you can accelerate even though your speed doesn’t change.



7. Acceleration is a change in _____________ over time.

Respuesta :

Answer:

1.The speedometer of a car read the  instantaneous speed not the average speed.We know that average speed is the ratio of total distance to the total time.It changes during when the car is moving .

2.No,I am not sure because it may change the direction .When car changes the direction it means that velocity of car changes.

3.The gas pedals and the brakes pedals cause a change in speed of the car.

4.The gas pedals ,steering and the brakes pedals cause a change in velocity of the car.

5.When car is traveling with constant speed tan we can say that it have zero acceleration.

6.When we changes the direction of car.

7.Acceleration is the change in the velocity over a time.

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