Physics Review- One Dimensional Motion Name: ______

Physics Review- One Dimensional MotionName: ______

LT#1: Recognize the type of motion represented by a Distance-Time graph.

1. Which of the following statements about position-time graphs are TRUE? List all that apply.

1. Position-time graphs can be used to represent the motion of objects with accelerated motion.
2. The slope on a position-time graph is representative of the acceleration of the object.
3. A straight, diagonal line on a position-time graph is representative of an object with a constant velocity.
4. An object with a negative velocity will be represented on a position-time graph by a line with a negative slope.

2. Two cars are headed in the same direction; the one traveling 60 km/hr is 20 km ahead of the other traveling 80 km/hr. Draw a distance-time graph showing the motion of the cars.

3. If car A passes car B, then car A must be ____.

1. accelerating.
2. accelerating at a greater rate than car B.
3. moving faster than car B and accelerating more than car B.
4. moving faster than car B, but not necessarily accelerating.

LT#2: Understand the distinction between speed and velocity. Interpret the slope of a D-T curve as velocity and calculate problems using the velocity equation.

4. Scalar vs. Vector

Speed is a ______because ______

Velocity is a ______because ______

5. The following data was collected:

a. Plot the position - time graph for the skater.

b. How far from the starting point was he at t = 5s?

c. Was his speed constant? If so, what was it?

6. Amy rides her bike for 5 hrs at an average speed of 16 mph then finishes her ride at an average speed of 19 mph for 2hrs. What is her average speed across the entire trip?

LT#3: Recognize the type of motion represented by a Velocity-Time graph.

D-T to V-T to A-T worksheet (All Graphs Worksheet)

LT#4: Understand the distinction between distance and displacement. Interpret the slope of a V-T curve as acceleration and calculate problems using the acceleration equation.

7. Sarah jogs for 15 min. at 240 m/min., walks the next 10 min. at 90 m/min., rests for 5 min., and then jogs back to where she started at 180 m/min.

a. Plot a velocity-time graph for Sarah’s exercise run.

b. Find the area under the curve for the first 15 min. What does this represent?

c. What is the total distance traveled by Sarah?

d. What is Sarah’s displacement from start to finish?

8. Which of the following statements about distance and/or displacement are TRUE? List all that apply.

1. Distance is a vector quantity and displacement is a scalar quantity.
2. If a person walks in a straight line and never changes direction, then the distance and the displacement will have exactly the same magnitude.
3. The phrase "20 mi, northwest" likely describes the distance for a motion.
4. The diagram below depicts the path of a person walking to and fro from position A to B to C to D. The distance for this motion is 100 yds.
5. For the same diagram below, the displacement is 50 yds.

9. What does the area under a velocity – time graph represent?

A. velocityC. acceleration

B. distanceD. slope

LT#5: Given any motion graph (D-T, V-T, or A-T), determine its corresponding DT, V-T, or A-T graph.

D-T to V-T to A-T worksheet (All Graphs Worksheet)

LT#6: Calculate problems using Galileo’s equations of motion.

10. In an emergency, you bring your car to a full stop in 8.0 seconds. The car is traveling at a rate of 21 m/s when you apply the brakes. What is the car’s acceleration? How far do you travel before stopping?

11. A jet plane traveling at 88 m/s lands on a runway and comes to rest in 11 s.

a. What is the plane’s acceleration?

b. How far does the plane travel?

12. A baseball pitcher delivers a fast ball. During the throw, the speed of the ball increases from 0 to 30.0 m/s over a time of 0.100 seconds. The average acceleration of the baseball is ____ m/s2.

LT#7: Calculate the acceleration due to gravity on earth and apply all of Galileo’s equations of motion to free fall.

13. A platform diver trips off the platform and hits the water vertically with a velocity of 4.2 m/s., and enters the water 2.5 s later. How high is the platform above the water?

14. Which of the following statements about free fall and the acceleration of gravity are TRUE? List all that apply.

1. An object that is free-falling is acted upon by the force of gravity alone.
2. A ball is thrown upwards and is rising towards its peak. As it rises upwards, it is NOT considered to be in a state of free fall.
3. A ball is thrown upwards, rises to its peak and eventually falls back to the original height. The speed at which it is launched equals the speed at which it lands. (Assume negligible air resistance.)
4. The value of g on Earth is approximately -9.8 m/s2.

15. When a rock is dropped, it will accelerate downward at a rate of -9.8 m/s2. If the same rock is thrown downward (instead of being dropped from rest), it acceleration will be ____. (Ignore air resistance effects.)

16. An astronaut drops a feather from 1.2 m above the surface of the moon. If the acceleration of gravity on the moon is 1.62 m/s2, how long does it take the feather to hit the moon’s surface? How long would it take the feather to hit earth’s surface, negating air resistance?

17. A speedometer is placed upon a free-falling object in order to measure its instantaneous speed during the course of its fall. Its speed reading (neglecting air resistance) would increase each second by ____.

18. Ten seconds after being dropped from rest, a free-falling object will be moving with a speed of ____.

19. A tennis ball is thrown straight up with an initial speed of 32.5 m/s. It is caught at the same distance above the ground.

How high does the ball rise?

How long does the ball remain in the air?

At what speed is the tennis ball caught?