## higher homework for 6th March 2009

Here is your homework exercise on the introductory work we have covered on operational amplifiers.  Please hand this exercise in no later than Friday 6th March.

## Higher HW for Thursday 29 January

Here is your next homework exercise. You must hand this in no later than Thursday 29th January if you want to have it corrected and receive feedback before the Physics prelim on Monday 2nd February. The questions are on AC electricity and charging/discharging of capacitors.

## charging & discharging capacitors

We looked at factors affecting the shape of the charging & discharging curves of capacitors today. Here is a video I found on youtube that covers some of the areas we discussed. Ignore the maths bit at the end, we won’t need that. Notice how the man in the film uses a lightbulb as a way of showing when the current is large or small, clever, eh?

## using an oscilloscope

Although we’ve completed the ac section of unit 2, some of you might want to get some practice at using an oscilloscope to determine the frequency & peak voltage of a signal.

Use the link below to try using the virtual oscilloscope I had on the SMARTBoard.  You can view different signals by connecting different coloured leads to the inputs.

www.virtual-oscilloscope.com

## Higher HW for Friday 16 January

Your HW sheet with questions on EMF and the Wheatstone Bridge is attached.  Please hand it in no later than the above date.

## deriving the equations of motion

I’ve been looking through the results of the traffic light survey we did at the end of unit 1 of the higher course.  The learning outcome that most people were unhappy about was the derivation of the equations of motion.

I put together a handout that outlines where the 3 equations come from, starting with a simple velocity-time graph.  Let me know if you think your understanding of this outcome would benefit from the video treatment I have used in your homework solutions.

## equations of motion – projectile motion

How to separate out the horizontal and vertical motion of a projectile and apply the equations of motion.

## equations of motion – combining up & down vertical motion

This is an example showing the importance of adopting a sign convention at the start of your problem.

## equations of motion – final velocity

An example illustrating how to determine the final velocity of an object when initial velocity, acceleration and distance are known.

## equations of motion – initial velocity

This example shows how to find the initial vertical velocity of an object if its maximum height (apex) is known.