Hey Mr Lau, do we have to measure the frictional force? Or can we change our hypothesis to: As the mass of the wooden block increases, it taked a longer time to travel the same distance. Therefore, it travels with a slower speed, which also means there is greater friction.
It seems that you are not very clear on the effects of mass on motion: the mass of an object has an effect on it's motion, and this is independent from the friction. In other words, your new proposal will not be only dealing with friction. As you are still in lower secondary, I suggest that you stick to measuring forces rather than dealing with forces and motion. I am intrigued by your hesitation to measure the friction directly - why is that?
ReplyDeleteAre we gonna use the spring balance, or are we using a force transducer? I just found out about it.
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