The effect of varying force on the acceleration of an object

• Describe this practical

  1. On a bench, attach a trolley carrying weights on to a string, then loop one end of the string around the pulley and attach the other end to a 100 g mass 2. Set up chalk lines of equal intervals and let go of the car, timing how long it takes for the car to pass each line. 3. Repeat until all the weights on the trolley are on the 100 g mass

  
• It can be difficult to accurately time the trolley passing all of the chalk lines at different times. What is a more accurate way of finding the times?

  Record the experiment with a mobile phone and keep on replaying the video to work out the times
• What is this practical looking for?

  This practical investigates how changing the force impacts the acceleration of an object
• What is a risk of this practical?

  The masses falling onto the investigator's feet