x Turn on thread page Beta
 You are Here: Home >< A-levels

# M1 - dynamics help! watch

Announcements
1. A tile on a roof becomes loose and slides from rest down the roof. The roof is modelled as a plane surface inclined at 30° to the horizontal. The coefficient of friction between the tile and the roof is 0.4. The tile is modelled as a particle of mass m kg.
(a) Find the acceleration of the tile as it slides down the roof.
(7)
The tile moves a distance 3 m before reaching the edge of the roof.
(b) Find the speed of the tile as it reaches the edge of the roof.
(2)
(c) Write down the answer to part (a) if the tile had mass 2m kg.
(1)
(Total 10 marks)

really need help with part a
2. (Original post by h_1411)
A tile on a roof becomes loose and slides from rest down the roof. The roof is modelled as a plane surface inclined at 30° to the horizontal. The coefficient of friction between the tile and the roof is 0.4. The tile is modelled as a particle of mass m kg.
(a) Find the acceleration of the tile as it slides down the roof.
(7)
The tile moves a distance 3 m before reaching the edge of the roof.
(b) Find the speed of the tile as it reaches the edge of the roof.
(2)
(c) Write down the answer to part (a) if the tile had mass 2m kg.
(1)
(Total 10 marks)

really need help with part a
F = ma.

Gravity, friction, reaction all act on the tile. Can you find their values?

Posted from TSR Mobile
3. I drew the diagram and all the forces acting on it but I just get confused as to what to do after

Posted from TSR Mobile

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: January 21, 2015
Today on TSR

### Loughborough better than Cambridge

Loughborough at number one

Poll

## All the essentials

### Student life: what to expect

What it's really like going to uni

### Essay expert

Learn to write like a pro with our ultimate essay guide.

### Create a study plan

Get your head around what you need to do and when with the study planner tool.

### Resources by subject

Everything from mind maps to class notes.

### Study tips from A* students

Students who got top grades in their A-levels share their secrets