REQUIRED PRACTICALS Flashcards
1
Q
stretching a spring (8)
A
- clamp stand, two bosses and two clamps
- place a heavy weight on the clamp stand to stop it falling over
- attach a metre rule and a spring
- the top of the spring must be at the zero point on the metre rule
- bottom of the spring has a wooden splint attached as a pointer
- unstretched length = the beginning length of the spring with no force attached
- hang a 1 N weight on the spring and read the new position on the metre rule
- continue to do this with a few weights added
2
Q
acceleration (6)
A
- toy car attached to a piece of string; string is looped around a pulley
- other end of the string is attached to a 100g mass; this weight will provide the force acting on the toy car
- draw chalk lines on the desk at equal intervals (every 10cm)
- hold toy car at starting point and then let go
- car accelerates along the bench; record the time that the car passes each distance marker
- repeat the experiment several times, decreasing the mass on the end of the string
3
Q
ripple tank (4)
A
- bar connected to a power pack in a tray of water; when the bar vibrates, it creates waves across the surface of the water
- lamp above the ripple tank and sheet of white paper below the tank
- to measure wavelength: place a ruler on the paper and freeze the image of the waves; measure the distance between around ten wavelengths
- to measure frequency: use a timer an count the number of waves passing a point in one second
4
Q
waves in a solid (6)
A
- string with one end attached to a vibration generator; the other end attached to a hanging mass
- vibration generator attached to a signal generator, which allows a change in the frequency of vibration of the string
- turn on the power; string vibrates
- use a ruler to measure the wavelength of the standing wave
- read frequency from signal generator
- calculate wave speed using equation
5
Q
infrared (4)
A
- leslie cube with four different coloured surfaces: shiny metallic, white, shiny black, and matt black
- fill leslie cube with hot water
- point an infrared detector at each of the four surfaces and record amount of infrared emitted
- make sure there is the same distance between each surface and the detectors: makes the measurements repeatable
6
Q
what is the outcome of the infrared practical? (2)
A
- matt black emits the most infrared radiation
- shiny metallic emits the least infrared radiation
7
Q
define resolution
A
the smallest change that can be detected
