REQUIRED PRATICAL Flashcards
(20 cards)
What is the student trying to investigate during Required Practical 6: Stretching a Spring?
Investigating the relationship between force and extension in a spring
What is the apparatus for Required Practical 6: Stretching a Spring??
Have a clamp stand with 2 bosses and clamps. And a heavy weight on the clamp stand to prevent it from tipping.
Attach a metre ruler on one clamp and a spring with a pointer on another clamp.
The top of the spring must be at the zero point of the ruler.
What is the process of Required Practical 6: Stretching a Spring?
- Set up the apparatus.
- Read the position of the pointer on the metre ruler. (unstretched length with no force)
3.Next add a 1N weight on the spring and read the new position of the point on the metre ruler.
4.Continue adding 1N weight to the spring and reading the position of the pointer. - Now need to find the extension (subtract the length of the unstretched spring from each reading)
6.Plot our point on an extension-weight graph - Measure the extension of MO on graph and read weight
In Required Practical 6: Stretching a Spring what should the student see?
-Extension ∝ weight
-Linear relationship between force and extension(straight line)
What is the student trying to investigate in Required Practical 7: Acceleration?
investigate how the acceleration of an object is affected by the force applied to it or the mass of the object
What is the apparatus for Required Practical 7: Acceleration?
Have a toy car attached to a string which is looped around a pulley. At the other end of the spring add 100g mass.
On the desk draw chalk lines ay equal intervals (every 10cm)
What is the process for Required Practical 7: Acceleration?
- Set up the apparatus.
- When ready let go of the car, and the car will accelerate along the bench. (Bcs of resultant force acting on object)
- Record the time the car passes each distance. If too rapid record with phone. And replay back to record times accurately.
4.Repeat again multiple times but decrease the mass on each string (80-60-40..) and measure acceleration - Investigating varying mass: repeat again without changing the mass on the end of the spring but increasing mass of the toy car.
What should the student see in Required Practical 7: Acceleration?
The acceleration of the toy car is proportional to the mass on the end of the other string. (Newton 2nd law of motion)
What is student investigating in Required Practical 8: Ripple Tank?
To observe and measure the wave speed, wavelength, and frequency of water waves using a ripple tank.
What is the apparatus for Required Practical 8: Ripple Tank?
Have a ripple tank in a shallow tray if water with a vibrating bar inside connected to a power pack.
Have a white paper under all and a lamp over.
What is the process for Required Practical 8: Ripple Tank?
- When bar vibrates it creates waves on the surface of the water while recording on a phone which allows us to watch in different speed or freeze completely.
- Measure wavelength - place ruler on paper and freeze the image of the waves. Find distance of total 10 waves then divide by 10.
3.Frequency - place timer near paper and the number of waves passing a point for one second. HARD - so count number of waves in 10 sec then divide by 10
4.Speed - use wave equation to find speed
What is the student trying to investigate in Required Practical 8: Waves in a solid?
To measure the frequency and wavelength of waves in a solid (e.g. a vibrating string), and then calculate the wave speed using
What is the apparatus for Required Practical 8: Waves in a solid?
We have a one end of the string attached to a vibration generator (which is attached to signal generator) with the other end having hanging masses which keeps the string taut
What is the process of Required Practical 8: Waves in a solid?
- Set up the apparatus
2.At a certain frequency we get a standing wave which is due to the effect of resonance.
3.Measure the wavelength by using a ruler and measure the total length of the standing wave from the wooden bridge to the vibration generator - Speed-using our wavelength we can find out the wavespeed
5.Frequency - signal generator
What happens if we more then 2 of 1/2 wavelengths in Required Practical 8: Waves in a solid?
Divide total length by the number of half wave lengths the multiply by 2
What is the student trying to investigate in Required Practical 10: Infrared?
investigate how different surfaces (like black, white, shiny, or matte) emit and absorb infrared radiation at different rates
What is the apparatus/process for Required Practical 10: Infrared?
- Fill the Leslie cube( 4 sides: black, white, shiny, or matte) with hot water
- Point a infrared detector at each of its
4 surfaces and record the amount of infrared emitted (ensure same distance so repeatable)
What should the student find during Required Practical 10: Infrared?
matt black -most infrared emissions
shiny black |
white |
shiny metallic -least infrared emissions
In Required Practical 10: Infrared what if we don’t have a infrared detector?
Use a thermometer with t he bulb painted black.-however the resolution is less than the infrared detector
In Required Practical 10: Infrared how do we measure the absorbance of infrared by different surfaces?
- We have a infrared heater with 2 metal plates on either side
- One plate has been painted with shiny metallic pain/ other plate painted with matte black paint
- We then attach Vaseline to attach a drawing pin
- Start the heater and timer - temp. increases as infrared is absorbed. - RECORD TIME TAKEN for Vaseline to melt and drawing pin to fall of
The student should find that the drawing pin falls off the matte black plate first - matte black absorbs more infrared
