You are Here: Home >< Physics

# Physics Direction of Motion Question. watch

1. A rock is resting on a horizontal sheet of ice and acted on by two forces of magnitudes 15N and 20N, in perpendicular directions North and East respectively. The friction between the rock and the ice is negligible.

The rock accelerates at 4.0ms−2.
Find the direction in which it moves with respect to North.

2. Is the answer 53degrees east of north?
3. (Original post by Mihir saxena)
Is the answer 53degrees east of north?
Yes !
Thank you so much. But can you tell me how you got it please ? I still do not understand it. (I put your answer on the physics website and you got the correct answer)
4. See there are two forces, their resultant will be 15j-20i. Draw a triangle and the angle with y-axis will be the answer.
Attached Images

5. Does that make sense?
6. (Original post by Mihir saxena)
See there are two forces, their resultant will be 15j-20i. Draw a triangle and the angle with y-axis will be the answer.
Oh I understand now, thank you so much for your help ! xD
7. No problem

### Related university courses

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: March 14, 2018
Today on TSR

### 1,007

students online now

Exam discussions

### Find your exam discussion here

Poll

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