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Physics Chapter 2: Describing Motion
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Terms in this set (17)
Refer to the graph above. The acceleration of the object is equal to zero
The acceleration is never equal to zero.
A car is traveling at the velocity of 20 m/s on a flat road when it reaches the bottom of a hill. It coasts up the hill, coming to rest in 8 seconds. The average acceleration of the car while on the hill is
-2.5 m/s^2
A quantity that is a measure of how the velocity of a body changes with time is
acceleration.
An object's distance traveled as a function of time is shown in the graph above. The graph shows
an object moving at constant speed.
For the first hour a car is driven at a constant speed of 90 km/hr. The motor begins to vibrate and the driver reduces the speed to 45 km/hr for another 2 hours. The average speed for the entire trip is
60.0 km/hr
A student releases a ball from rest on an inclined place and measures that it travels a distance of 0.8 m in a time of 4.0 s. The average speed of the ball is
0.2 m/s
An auto, starting from rest, undergoes constant acceleration and covers a distance of 1250 meters. The final speed of the auto is 50 meters/sec. How long does it take the car to cover the 1250 meters?
50 s
A car moving initially at 30 m/s comes gradually to a stop in 900 m. What was the acceleration of the car?
-0.5 m/s^2
Refer to the speedometer in Fig. 2.3. The speedometer reading 75 mph is
Approx. 2 km per minute
If your average speed for a 6 hr trip is 60 mi/hr, the distance traveled is
360 mi
Initially you are driving at 55 mi/hr. If you come to a rest in 7.5 s while traveling 450 ft, what is your average speed while stopping?
60 ft/s
A sprinter moving at 10 m/s slows down at a rate of 1.4 m/s^2. How fast is the runner moving after 4 seconds?
4.4 m/s
If the braking distance of your car at a certain speed is 200 ft and, after reacting to a situation, you have managed to stop your car in 5.0 s, then the magnitude of the acceleration was
16 ft/s^2
Which of the following is not an appropriate unit for measuring acceleration?
m/s
Two velocity vectors are added: one of magnitude 2.0 m/s and one of a magnitude 4.0 m/s. Not knowing the respective directions, we can say that the magnitude of the sum of the vectors will be
between 6.0 m/s and 2.0 m/s
A car driver takes Turn 1 at Daytona International Speedway at a steady 120 mph all the way through the turn. The radius of this turn is 1000 ft. Which statement is true?
Change of direction at constant speed means a change in velocity.
A car starts from rest and after 10 seconds is traveling at 30 m/s. Assuming that it continues to accelerate at the same rate it will take another _______ seconds to reach 60 m/s.
10
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