Kinematics unit test
A test on this unit alone, marked as a percentage and a letter grade — for the test your class is actually sitting, rather than for May. Answer everything, then submit once: seeing the answer to question 3 before attempting question 4 makes the final percentage meaningless.
Average vs instantaneous velocity
Slope with units
Scalar vs vector
Free fall
Control variable
Kinematic equation without final velocity
Vector components
Independence of projectile components
Acceleration
Area under an acceleration-time graph
Interpreting a curved velocity-time graph
Reading a graph to find another quantity
Short answer 1. Define or explain: Projectile launched at an angle
3 ptsShort answer 2. Define or explain: Position-time graph
3 ptsShort answer 3. Define or explain: Slope of a velocity-time graph
3 ptsShort answer 4. Define or explain: Instantaneous velocity from a position graph
3 ptsFree response
7 ptsA student launches a ball horizontally from the edge of a table of height 1.20 m with speed v₀ and measures where it lands. She repeats the experiment for several launch speeds. (a) Derive an expression for the horizontal distance R in terms of v₀, h and g. (b) The student plots R against v₀ and obtains a straight line through the origin. Explain why the graph is linear, and state what the slope represents in terms of h and g. (c) A second student claims that launching from a greater height would change the slope of the R-versus-v₀ graph. State whether this claim is correct and justify your answer.
Derive an expression for the horizontal distance R in terms of v₀, h and g.
The student plots R against v₀ and obtains a straight line through the origin. Explain why the graph is linear, and state what the slope represents in terms of h and g.
A second student claims that launching from a greater height would change the slope of the R-versus-v₀ graph. State whether this claim is correct and justify your answer.