To investigate the effect of varying the mass of an object on the acceleration produced by a constant force.
The same apparatus and method can be used as in the investigation on the previous page. However, this time use 100 g (0.98 N) of force for every run, but add increasing numbers of slotted masses to the glider. Preliminary experiments may need to be carried out to find a suitable range of masses to add. Record the total mass of the glider and hanging masses combined.
Record the acceleration results in a suitable table, similar to the example results below:
|Mass added to glider in kg||Total mass in kg||Run 1||Run 2||Run 3||Mean|
For the total mass of each glider, calculate the value of .
For example, 100 g has a mass of 0.1 kg. The value of is = 10 /kg.
Plot a line graph with acceleration on the vertical axis and on the horizontal axis. Draw a suitable line of best fit.
Describe what the results show about the effect of decreasing the mass (increasing the value of ) of the object on its acceleration.
Acceleration is inversely proportional to the mass of the object. This means that a graph of acceleration against should produce a straight line that passes through the origin. To what extent do your results show this relationship? For example, do all your points lie on a straight line passing through the origin, or are there any anomalous points?
|Electrical appliance||Electrical fault – fire/shock||Check mains cable and plug are not broken or wiring exposed before use|
|Masses and glider falling to floor||Objects falling on feet||Use relatively small masses and step back after releasing glider|