A speedometer normally measures __________.
velocity
distance traveled
average speed
instantaneous speed
The difference between speed and velocity involves ________.
acceleration
path length
direction
the magnitude of each
Galileo discovered that when air resistance can be neglected, all objects fall with the same _______.
distance
speed
energy of motion
Each second, a ball rolling down an inclined plane picks up ___________.
increasing amounts of speed
acceleration, not speed
the same amount of speed
decreasing amounts of speed
When we're talking about how quickly "how fast" changes, we're talking about _______.
increases in falling distance
the difference between speed and velocity
free-fall physics
In its first second of free fall, a dropped softball will fall a vertical distance of ________.
20m
15m
5m
10m
A ball freely falling at 20 m/s will in the next second have a speed of _________.
more than 30 m/s
20 m/s
10 m/s
30 m/s
The vertical height attained by a basketball player who achieves a hang time of a full 1 s is...
about 1.2 m
about 0.8 m
more than 2.5 m
about 2.5 m
about 1 m
A pot falls from a ledge and hits the ground 45 m below. The speed with which it hits the ground is
about 60 m/s
about 120 m/s
about 30 m/s
more than 120 m/s
A ball is thrown upwards. Neglecting air resistance, what initial upward speed does the ball need to remain in the air for a total time of 10 seconds?
about 80 m/s
about 50 m/s
about 100 m/s
about 110 m/s
A car accelerates at 2 meters per second per second. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 30 m/s?
2 seconds
15 seconds
60 seconds
30 seconds
none of these
If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about
1 second
10 seconds
20 seconds
not enough info to estimate
If a projectile is fired straight up at a speed of 10 m/s, the time it takes to reach the top of its path is about
not enough information to estimate
In each second of fall, the distance a freely falling object will fall is
about 10 m
the same, but not 5 m or 10 m
about 5 m
increasing
It takes 6 seconds for a stone to fall to the bottom of a mine shaft. How deep is the shaft?
more than 200 m
about 60 m
about 120 m
about 180 m
Starting from rest, the distance a freely falling object will fall in 0.5 second is about
0.5 m
1 m
1.25 m
5 m
none of the above
A ball is thrown upwards and caught when it comes back down. In the presence of air resistance, the speed with which it is caught is always
more than the speed it had when thrown upwards
the same as the speed it had when thrown upwards
less than the speed it had when thrown upwards
impossible to determine
At one instant a heavy object in air is moving upward at 50 meters per second. One second later its speed is approximately
55 m/s
50 m/s
60 m/s
40 m/s
If a car accelerates from rest at 2 meters per second per second, its speed 3 seconds later will be about
2 m/s
3 m/s
4 m/s
6 m/s
A car accelerates at 2 meters/s/s. Assuming the car starts from rest, how far will it travel in 10 s?
10 m
100 m
2 m
40 m
200 m
A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval its acceleration is
1000 km/hr
110 km/hr
10 km/hr
zero
An object covers a distance of 8 meters in the first second of travel, another 8 meters during the next second, and 8 meters again during the third second. Its acceleration in meters per second per second is approximately
0
24
5
8
