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Physics Chapter 2: Describing Motion
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
A quantity that is a measure of how the velocity of a body changes with time is
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
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
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?
A car moving initially at 30 m/s comes gradually to a stop in 900 m. What was the acceleration of the car?
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
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?
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?
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
Which of the following is not an appropriate unit for measuring acceleration?
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.
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