Honors Physics
Chapter 2 Practice Problems
Please note:
It does you no good at all to just look at the answers and work backwards to figure out how to get that answer. Please try these problems without looking at the answers provided in the document posted on my webpage! There won’t be answer keys provided on quizzes and tests, so this is a good chance for you to try and solve the problems first, and then check to see if you are doing things right when you’ve attempted some (or all) of them. If you check your answers and all of your problems were right (or at least most of them), you are probably going to do very well on quizzes and tests from this chapter. If you miss quite a few, it’s not the end of the world…just go back and figure out how to correct your mistakes!
1) A toy train moves along a winding track at an average speed of 0.25 m/s. How far will it travel in 4.00 minutes?
2) You drive your car a distance of 10.0 km in 30.0 minutes. What was your average speed in meters per second?
3) Rolling along down the hallway at a constant speed of 4.25 m/s, a robot covers a distance of 17.0 meters. How long did the journey take?
4) Convert the speed of 0.200 cm/sec into kilometers per year.
5) A car travels along a road and its odometer readings (in meters) are plotted against time (in seconds) as shown below. Find the INSTANTANEOUS SPEED of the car at points A and B. What is the car’s AVERAGE speed between t = 0 and t = 20 seconds?
6) A track runner makes one lap around a 200.0 m track in a time of 25 seconds. What were the runner’s average speed and average velocity?
7) A car’s odometer reads 22687 km at the start of a trip and 22791 at the end of a trip. The trip took 4.0 hours. What was the car’s average speed in km/hr and m/s?
8) A car travels at a rate of 25 km/hr for 4.0 minutes, then at 50 km/hr for 8.0 minutes, and finally at 20.0 km/hr for 2.0 minutes. Find:
a. The total distance covered in kilometers
b. The average speed for the entire trip in m/s
9) A robot named Mr. Wilson is initially moving at 2.20 m/s along a hallway in our high school. It speeds up to 4.80 m/s in a time of 0.20 seconds. Determine the magnitude of its average acceleration along the path traveled.
10) A car is traveling at 20.0 m/s when the driver slams on the brakes and brings it to a straight-line stop in 4.2 seconds. What was the magnitude of the average acceleration?
11) An object starts from rest with a constant acceleration of 8.00 m/s2 along a straight line. Find:
a. The speed at the end of 5.00 seconds
b. The average speed for the 5.00 second interval
c. The distance traveled in 5.00 seconds
12) A truck’s speed increases uniformly from 15 km/hr to 60. km/hr in 20.0 seconds. Determine (and give all in units of meters and seconds!):
a. The average speed
b. The acceleration
c. The distance traveled
13) An object’s one-dimensional motion along the x-axis is graphed in the provided figure. Describe its motion over the time interval shown.
14) The vertical motion of an object is graphed in the provided figure. Describe its motion qualitatively (in words), and find its instantaneous velocity at points A, B, and C
15) A ball is dropped vertically from rest at a height of 50.0 meters above the ground.
a. What is its speed just before it hits the ground?
b. How long does it take to reach the ground?
16) A skier starts from rest and slides 9.0 m down a slope in 3.0 seconds. In what time after starting will the skier acquire a speed of 24 m/s? Assume that the acceleration is constant and the path is straight.
17) A school bus moving in a straight line at a speed of 20.0 m/s begins to slow at a constant rate of 3.0 m/s each second. Find how far it goes before stopping.
18) A car moving along a straight road at 30.0 m/s slows uniformly to a speed of 10.0 m/s in a time of 5.0 seconds. Determine:
a. The acceleration of the car
b. The distance the car moves from t = 2 to t = 3 seconds
19) A baseball is thrown straight upward and it rises to a height of 20.0 meters. What was the speed that the ball was initially thrown at?
20) A baseball is thrown straight upward with a speed of 20.0 m/s. It is caught on the way down at a point 5.0 meters above where it was thrown.
a. How fast was the ball going when it was caught?
b. How long was the ball in the air?
21) A ball that is thrown vertically upward on the Moon returns to its starting point in 4.0 seconds. Knowing that the acceleration due to gravity on the moon is 1.60 m/s2, what was the initial speed of the ball?
22) A baseball is thrown straight upward on the Moon with an initial speed of 35 m/s. Calculate (and use the value for gravitational acceleration given in the previous problem!!):
a. The maximum height reached by the ball
b. The time taken for the ball to reach that height
c. Its velocity 30 seconds after it is thrown
d. When the ball’s height is 100 m