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2. In the experiment the frictional force was not considered constant. What are the reasons that...

2. In the experiment the frictional force was not considered constant. What are the reasons that the frictional force was not constant?

3. If the mass of the cart is 10 g (1 kg = 1000 g), how much is the initial height in position 1? (v=0, Ug=0.100J, Ek=0J, Etot=0.100J)

4. If the mass of the cart is 10 g (1 kg = 1000 g), how much is the normal force on the cart in position 3? (r=0.500m, Ek=0.040J, Ug=0.040J, Etot=0.100J)
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