You are Here: Home >< Physics

# Momentum questions Watch

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!

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: April 1, 2016
Today on TSR

### What is the latest you've left an assignment

And actually passed?

### Simply having a wonderful Christmas time...

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.