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# Momentum questions

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1. Could I please have some help with 8bii? I'm really confused as to why the normal reaction force doesn't just equal the weight of the skateboarder in this example

thank you for any help
2. (Original post by ihateocr12345)

Could I please have some help with 8bii? I'm really confused as to why the normal reaction force doesn't just equal the weight of the skateboarder in this example

thank you for any help
You have previously calculated the centripetal force - the resultant force acting perpendicular to the ramp. So you can equate the centripetal force from bi) to the resultant force acting on the skateboarder: the contact force minus the weight.
3. (Original post by tory88)
You have previously calculated the centripetal force - the resultant force acting perpendicular to the ramp. So you can equate the centripetal force from bi) to the resultant force acting on the skateboarder: the contact force minus the weight.
I completely forgot about centripetal force and how it's the resultant force acting on an object, describing a circular path Thanks a lot tory!

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