Name: ______
Date: ______Block: _____
Linear Motion Pre-test
Use the equations provided below to answer the following questions:
vavg = (v0 + v)/2
vavg = Dx/Dt
aavg = Dv/Dt
v = v0 + at
Dx = ½ (v0 + v)t
Dx = v0t + ½ at2
v2 = v02 + 2aDx
1. Two birds are flying directly towards each other at the same speed. If the first bird is flying at a velocity v, what is the velocity of the second bird?
a) -v
b) The same
c) 2v
d) Can’t be determined
2. A driver would be able to set a track record if he is able to complete 200 laps of 2.5 miles each at the Indianapolis Motor Speedway in 2 hours. How would his velocity and speed compare?
a) They are the same.
b) They are equal, but opposite from each other.
c) The speed would be greater than the velocity.
d) The velocity would be greater than the speed.
3. Oil drips at 0.5 second intervals from a car that has an oil leak. Which pattern best represents the spacing of oil drops as the car accelerates uniformly from rest?
a)
b)
c)
d)
4. A couple of students at Valley decide to go bicycle riding one day. Simon rides at a speed of 10 miles per hour, while Liz's average speed is 20 miles per hour. After bicycling for several hours, both Simon and Liz come home and park their bicycles exactly where they started. Simon's average velocity for the entire ride is
a) lower than Liz's average velocity
b) higher than Liz’s average velocity
c) zero
d) impossible to determine without knowing the direction in which they were going.
5. If, during their bike ride, Simon and Liz were always biking at a constant speed,
a) Their acceleration was always zero
b) Their velocity was always constant
c) Their average velocity after one hour of biking was the same as their average velocity after two hours of biking
d) None of the above
6. The graph shown represents the relationship between distance and time for an object in motion. During which interval is the speed of the object changing?
a) AB
b) BC
c) CD
d) DE
7. A raindrop on a drizzly day takes one minute from the time it leaves the cloud until it hits your umbrella, which is 3 miles below. The average velocity of the raindrop on its journey is
a) 3 miles/hr
b) 60 miles/hour
c) 180 miles/hr
8. The graph below shows the speed of an object plotted against the time.
The total distance traveled by the object in the first 4 seconds is
a) O.5 meters
b) 8 meters
c) 2 meters
d) 4 meters
9. A speedboat increases its speed uniformly from 20 m/s to 30 m/s in a distance of 200m. Find the magnitude of its acceleration.
a) 1.25 m/s2
b) 4.0 m/s2
c) 8.0 m/s2
d) 10 m/s2
10. A tortoise and a hare are in a road race to defend the honor of their breed. The tortoise crawls the entire 1000 meters at a speed of 0.2 m/s. The rabbit runs the first 200 meters at 2 m/s, stops to take a nap for 1.3 hours, and awakens to finish the last 800 meters with an average speed of 3 m/s. Who wins the race and by how much time?
a) They both arrive at the same time
b) Tortoise wins by 47 s
c) Rabbit wins by 45 s
d) Insufficient information, can’t be determined