physics question help

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kfcloud
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i was revising and marking a practice paper and i dont understand this answer, can anyone please help me?
the question was 'a light gate and data logger can be used to determine the speed of each rider and sled going down a slide. what two measurements are needed to determine the speed of the rider and sled?'. the answers were 'time for sled to pass light gate' and 'length of sled'. i dont understand why the length of sled would need to be known, ive been thinking a bit but i just cant make sense of it. i can understand needing to know the lenth of the slide, but why the sled? does anyone know why this is? thank you
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mqb2766
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#2
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(Original post by kfcloud)
i was revising and marking a practice paper and i dont understand this answer, can anyone please help me?
the question was 'a light gate and data logger can be used to determine the speed of each rider and sled going down a slide. what two measurements are needed to determine the speed of the rider and sled?'. the answers were 'time for sled to pass light gate' and 'length of sled'. i dont understand why the length of sled would need to be known, ive been thinking a bit but i just cant make sense of it. i can understand needing to know the lenth of the slide, but why the sled? does anyone know why this is? thank you
A light gate wouldnt tell you when the sled started the slide (length of slide), but it can tell you the difference in time between the front of the sled and the back of the sled passing the light gate. Hence if you know the sled's length, you know its speed.
Last edited by mqb2766; 3 months ago
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kfcloud
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#3
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(Original post by mqb2766)
A light gate wouldnt tell you when the sled started the slide (length of slide), but it can tell you the difference in time between the front of the sled and the back of the sled passing the light gate. Hence if you know the sled's length, you know its speed.
oh, i understand! thank you so much, i was very confused
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