Looks like you need to understand moments... This is a different example but its similar. Basically x has 2 components. One of them acts in the same direction as the plane, which creates no turning effect but the one perpendicular to the plane is what you have to visualise...
When a question (like 2a of June 2012) asks you to find the SPEED of particles after a collision, and you've worked out the velocity, how can you know if it is the speed or you need to convert?
Looks like you need to understand moments... This is a different example but its similar. Basically x has 2 components. One of them acts in the same direction as the plane, which creates no turning effect but the one perpendicular to the plane is what you have to visualise...
Oh right! That makes sense, haha. Okay how about this. The horizontal at X, is it clockwise or anticlockwise? Taking moment about B.
X is acting clockwise. There's quite a simple trick to figuring this out; if the rod were fixed at B and you applied a large force in the direction of X, would the rod go about B clockwise or would it go about anticlockwise? Quite obviously it would immediately go clockwise, so that's the direction the moment is acting in.
X is acting clockwise. There's quite a simple trick to figuring this out; if the rod were fixed at B and you applied a large force in the direction of X, would the rod go about B clockwise or would it go about anticlockwise? Quite obviously it would immediately go clockwise, so that's the direction the moment is acting in.
Just get the feeling its going to be terribly difficult. Jan's paper was relatively simple. Anyhow, goodluck everyone, and please god 80 ums would be swell.
When a question (like 2a of June 2012) asks you to find the SPEED of particles after a collision, and you've worked out the velocity, how can you know if it is the speed or you need to convert?