Practice Test 1d kinematics
Multiple Choice
Identify the choice that best completes the statement or answers the question.
1. What is the speed of an object at rest? a. 0.0 m/s b. 1.0 m/s 2. In addition to displacement, which of the following must be used for a more complete description of the average velocity of an object? a. m c. t b. kg d. x 3. Acceleration is a. displacement. b. the rate of change of displacement. 4. A marble accelerates from rest at a constant rate and travels for a total displacement of 44 m in 20.0 s. What is the average velocity of the marble? a. 1.1 m/s c. 4.4 m/s b. 2.2 m/s d. 0.0 m/s 5. A curious kitten pushes a ball of yarn at rest with its nose, displacing the ball of yarn 17.5 cm in 2.00 s. What is the acceleration of the ball of yarn? a. 11.0 cm/s2 c. 14.4 cm/s2 2
b. 8.75 cm/s d. 4.38 cm/s2 c. 9.8 m/s d. 9.81 m/s c. velocity. d. the rate of change of velocity. Free response Problems 1. Distinguish between the displacement of a traveler who takes a train from New York to Boston and the displacement of a traveler who flies from Boston to New York. Be sure to compare the magnitudes of the displacements. 2. Why is the direction of free-­‐fall acceleration negative? Displacement (m) 1.0 2.0 3.0 4.0 5.0 Time (s) 2.0 4.0 6.0 8.0 10.0 3. Construct a graph of position versus time using the data in the table above. What value is represented by the slope of a graph? Find the slope between t = 1 s and t = 2 s. Be sure to use appropriate SI units. .
4. The graph above shows displacement versus time. What is the average velocity for line B? 5. A pair of spectacles are dropped from the top of a 32.0 m high stadium. A pen is dropped 2.0 s later. How high above the ground is the pen when the spectacles hit the ground? (Disregard air resistance, g = 9.81 m/ 6. A ball has a initial velocity of 1.0 m/s and experiences a constant acceleration of 0.5 m/s2. What is the final velocity after 3.0 s? 7. A stone drop from a 10.0 m high building. Determine the speed when the stone hits the ground? 8. The teacher throws a marker vertically upward and catches it in the same spot as it returns. Explain the velocity and acceleration affecting the marker at different points going up and down. The direction and if it goes faster or slower. 9. Explain the graph below, what can you tell from this graph?