RQ Practicals Flashcards
Force & Extension
1) Set up clamp stand with a meter ruler in one clamp and a spring in another
2) record the reading on the meter ruler level with the bottom of the spring
3) hang a 2N weight from the spring
4) record new position on
Bottom of the spring
5)calculate extension using final - initial length
6)Add more 2N weights each time and repeat steps
Source of inaccuracy : not clamping ruler vertically , not measuring at eye level
Force = spring constant x extension
Acceleration
1) Add a string to the car and attach a mass hanger , over a pulley clamped at the edge of the desk
2) let go of the car , and measure the time how long it takes to travel between two light gates
3) measure change in velocity using light gates , and time taken using a stopwatch
4) calculate acceleration using a = change in velocity / time
5) Add mass to the hanger , repeat for different mass
6) use weight = m x g to calculate force
7) repeat for different forces
Ripple tank
1) Frequency - count the number of waves passing a point in 10 seconds time with a stop clock
2) Frequency = number / 10
(Number of waves in a second)
3) Wavelength- place ruler next to waves take a photo
Count waves in picture , measure length
Divide distance by no. of waves
Waves - vibrating string
1) Place one mass on the hanger
2) record frequency on signal generator and measure length of two loops
3) Use v= f x wavelength to calculate the speed
4) add additional masses to increase the tension , and repeat steps above to calculate the speed
4) infrared radiation
1) Use a measuring cylinder to measure equal volumes of water from the boiled kettle
2) pour into each flask and place thermometer inside
3) record the initial temperature on the thermometer
4) start the stopwatch and wait for 10 minutes before recording final temperature
5) Calculate decrease in temperature for both flasks
6) if the black flask has largest decrease then hypothesis is correct
Refraction
1) Draw around the glass block , and measure 90 degrees to its surface , then draw in the normal
2) measure an angle of 10 degrees to the normal using a protractor
3) shine a ray of light along this line mark where the ray exits the block
4) remove the block , join the lines up
5) measure the angle of refraction between the refracted ray and the normal using protractor
6) repeat process of an increase of 10 degrees in the angle of incidence each time
