Hello There!
Let's first talk about <em>"What Is Friction"</em>
<u>Friction is a force that pulls when two object touch each-other. Friction happens because the molecules on one surface interlock with the molecules on another surface.</u>
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Now, let's get back to our original question "What Effect Does Friction Have On A Roller Coaster"
On a roller coaster, friction is a force that opposes motion and significantly slows the cars as they move on the track.
So I’m gonna answer the first question on the second page:
For P the force is friction and for Q the force is forward thrust resultant force
