A Level Maths mechanics question-projectiles
https://www.quora.com/profile/Bravewarrior/p-160659267
Here is the question with its solution. I am stuck on part b. In the mark scheme, they put a minus sign in front of the coeff of friction x R when resolving horizontally. Can someone please tell me why they did that? Thank you!
Here is the question with its solution. I am stuck on part b. In the mark scheme, they put a minus sign in front of the coeff of friction x R when resolving horizontally. Can someone please tell me why they did that? Thank you!
Original post by pigeonwarrior
https://www.quora.com/profile/Bravewarrior/p-160659267
Here is the question with its solution. I am stuck on part b. In the mark scheme, they put a minus sign in front of the coeff of friction x R when resolving horizontally. Can someone please tell me why they did that? Thank you!
Here is the question with its solution. I am stuck on part b. In the mark scheme, they put a minus sign in front of the coeff of friction x R when resolving horizontally. Can someone please tell me why they did that? Thank you!
The particle is decelerating (negative acceleration) as friction acts against the direction of motion.
Reply 2
Original post by mqb2766
The particle is decelerating (negative acceleration) as friction acts against the direction of motion.
Ah that makes sense, thank you! 🙂
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