Motion Experiments Flashcards
How do you determine g with ticker tape?
Connect 12V power supply to ticker machine, and attach to 0.5m ticker tape, with 0.1kg mass. Time period between each dot is 1/50Hz=20ms. Measure the displacement and draw s against t^2 for different lengths of tape. Change in s divided by change in t squared gives 0.5a. Watch out for double dots.
How do you determine g with a steel ball?
Connect a steel ball to break-to-stop contacts. Over 1m, drop the ball. Breaking the contacts, which are connected to a circuit, starts a timer. Once the ball hits the contacts, the timer stops at the trap door. Plot displacement-time squared, and use the gradient to find 1/2a. This can be done over 7m from the second floor, using warning signs and only using the step ladder for the ground floor.
How do you determine g with light gates?
Drop a card between two light gates connected to a data logger. Find v^2-u^2 for different displacements, and plot against these in a graph. To find g, divide v^2-u^2/s and divide this by 2. Warning, cards may flip, reducing accuracy.
How do you determine g with a trolley accelerating down ramp?
Use a card with two projections, and connect light sensor to data logger. Set the angle with the inclinometer. Drop the trolley down the ramp. The logger will find v squared take away u squared, and divide by t to find acceleration. Use a=gsin0 to find gravity. Do graph a-sin0 and calculate gradient. Ensure the wheels are always engaged.
How do you determine g with a trolley accelerating down it at different distances?
Use one card. Add a trolley to a ramp and set angle sin0 using inclinometer. Connect light sensor to data logger. Release the trolley, and for seven distances v squared will be measured. V^2 /S = 2a. Use the gradient of the graph, and divide by two to get a. Then use g=a/sin0 to find gravity.
How do you determine g with a pendulum?
Raise a cotton string with a steel ball by displacement h. Release, and when perpendicular with the light and passing the light gate, the data logger will measure v squared. Use v squared =2gh, and divide v squared by h on the graph to get 2g. Divide by 2 to get gravity.
