AP Physics 1 Summer Assignment (2014)

Transcription

1 Name: Date: AP Physics 1 Summer Assignment (2014) Instructions: 1. Read and study Chapter 2 Describing Motion: Kinematics in One Dimension. 2. Answer the questions below. 3. Submit your answers online using this form: dmp9vm/viewform?usp=send_form Your answers must be submitted online before the first day of class. Questions: 1. A quantity that has both magnitude and direction is called a. A) scalar B) vector C) matrix D) coordinate 2. The Greek letter delta ( ) means A) average B) change in C) direction of D) magnitude of 3. Calculate the change in position when an object moves from x = 5.0 m to x = -2.0 m. A) -7.0 m B) +7.0 m C) -3.0 m D) +3.0 m 4. A person walks 80 m to the east, then turns around and walks 50 m to the west. How far is the person from her starting point? A) 30 m B) 50 m C) 80 m D) 130 m

2 5. Velocity is a quantity that tells you which two things about an object's motion? A) speed and position B) speed and direction C) position and time D) position and acceleration 6. If a plane can fly at an average speed of 640 km/h, how long will it take to travel a distance of 2000 km? A) 0.32 hours B) 1.7 hours C) 3.1 hours D) 5.2 hours 7. To calculate average velocity, you divide by elapsed time. B) position C) displacement D) velocity 8. Determine the average velocity of a car that travels from x = 25.0 m to x = 60.0 m in a time interval of 14 seconds. A) -2.5 m/s B) 2.5 m/s C) 0.4 m/s D) 35 m 9. Does the speedometer in a car show the car's average speed or instantaneous speed? A) average speed B) instantaneous speed 10. A car is traveling with an initial velocity of -2.7 m/s. Some time later, its velocity is 6.2 m/s. Calculate the change in velocity. A) 3.5 m/s B) -3.5 m/s C) 8.9 m/s D) -8.9 m/s

3 11. To calculate average acceleration, you divide by elapsed time. B) displacement C) velocity D) change in velocity 12. Displacement can be measured in units of A) meters B) meters per second C) meters per second per second 13. Velocity can be measured in units of A) meters B) meters per second C) meters per second per second 14. Acceleration can be measured in units of A) meters B) meters per second C) meters per second per second 15. Which quantity can be expressed in units of kilometers per hour per second? B) displacement C) velocity D) acceleration 16. What is the acceleration of a car that increases its speed from zero to 100 km/h in 10 seconds? A) 10 km/s B) 10 km/h C) 10 km/h per second D) 10 km/s per hour

4 17. If an object has an acceleration of 5 miles per hour per second, this means that for every second that passes, its velocity increases by A) 5 miles B) 5 miles per hour C) 5 miles per second D) 5 seconds 18. Determine the average acceleration of a car that increases its velocity from 5 m/s to 25 m/s in a time interval of 6 seconds. A) 3.3 m/s 2 B) -3.3 m/s 2 C) 2.7 m/s 2 D) -4.1 m/s Determine the final velocity of a motorcycle that accelerates from rest at a rate of 4.0 m/s 2 for 7.0 seconds. A) 11 m/s B) 21 m/s C) 28 m/s D) 56 m/s 20. Which vehicle has more acceleration, a car that goes from 50 km/h to 60 km/h in 2.0 seconds or a bike that goes from 2 km/h to 6 km/h in 0.8 seconds? A) car B) bike C) they have the same acceleration 21. Refer to Example 2-7 in the text. How long does it take a bus to cross a 32.0 m wide intersection after the light turns green, if the bus accelerates from rest at a constant rate of 1.20 m/s 2? A) 4.21 s B) 5.48 s C) 6.56 s D) 7.30 s

5 22. At a given location on the Earth and in the absence of air resistance, all objects fall with the same constant. A) velocity B) speed C) acceleration D) momentum 23. Velocity is defined as A) the rate of change of position B) the rate of change of acceleration C) the rate of change of distance D) the rate of change of momentum 24. Acceleration is defined as A) the rate of change of position B) the rate of change of velocity C) the rate of change of distance D) the rate of change of momentum 25. On a graph of position x versus time t, the slope of the line is equal to the B) displacement C) velocity D) acceleration 26. Which control(s) in a car cause a change in speed? (Select all that apply) A) gas pedal B) brake pedal C) steering wheel 27. Which control(s) in a car cause a change in direction? (Select all that apply) A) gas pedal B) brake pedal C) steering wheel

6 28. Which control(s) in a car cause a change in velocity? (Select all that apply) A) gas pedal B) brake pedal C) steering wheel 29. What is 75 m in units of kilometers? A) 750 km B) 7.5 km C) 0.75 km D) km 30. How many meters is 6.5 cm? A) 65 m B) 0.65 m C) m D) m 31. Convert 1.2 hours to seconds. A) 90 s B) 1240 s C) 4320 s D) 7200 s 32. The diameter of the Earth is 12,742 km. Estimate how many days it would take to walk around the Earth if you walk for 10 hours per day at a rate of 4 km/h. (Ignore the fact that most of the Earth is covered with water.) A) 500 days B) 1000 days C) 5000 days D) 10,000 days

7 33. Determine the slope of each line in the graph shown below Position (m) Time (s) 34. Solve the following equation for t: 12 = 25 3t 35. Use the quadratic formula to solve the following equation for t: -4.9t 2 +30t = 0