Karteikarten
Physics
Karten in diesem Stapel (21)
- 1Physics Experiments Describe an experiment to determine the density of a liquid and of a regularly shaped solid and make the necessary calculationLiquid:
- use a balance to measure the mass of an empty beaker and record it. (m1)
- Transfer a known volume of liquid from a measuring cylinder to the beaker.
- use a balance to measure the mass of the beaker containing the known volume of liquid. (m2)
- calculate the mass of the volume of liquid (m2 - m1)
- find the density from density = mass/volume.
Solid:
- measure the dimensions of the solid (length, width and depth) and record it.
- use a balance to fins the mass of the solid and record it.
- do the calculation density=mass/volume - 2Physics Experiments Performa and describe an experiment to determine the position of the centre of mass of a plane lamina- make a hole in the lamina, put a pin through it
- allow the lamina to swing freely into position and attach a plum line.
- mark the position of the plum line.
-repeat steps 1 to 3 on different edges of the card.
- the centre of mass will be where the lines all cross. - 3Physics Experiments Describe an experiment to demonstrate the properties of good and bad conductors of heatSolids:
- take rods of identical lengths of different materials.
- attach a math to the end of each using melted wax
- place the other ends of the rods together and heat using a bunsen burner.
- the max will melt quickest and the match will fall on the rods that are the best conductors of heat.
Liquids:
- place a small amount of ice in the bottom of a boiling tube and cover with a little metal gauge to keep the ice at the bottom
- fill the boiling tube with water
- use a bunsen burner to heat the boiling tube near the top
- the water at the top should boil whilst the ice at the bottom should stay frozen thereby showing that water is a poor conductor of heat. - 4Physics Experiments Describe an experimental demonstration of the refraction of light- draw the outline of a glass block onto a sheet of paper
- use a ray box to shine a single ray of light at an angle onto a glass block
- mark the position of the ray as it leaves the ray box, as it hits the glass block and as it leaves the glass block.
- remove the glass block and join the points to show the path of the ray. - 5Physics Experiments Describe n experiment to identify the pattern of field lines around a bar magnet 1. iron filings method 2. plotting compass methodiron fillings method:
- lay a piece of paper over the bar magnet
- sprinkle iron filings onto the paper
- tap the paper
- the iron filings will now show the pattern of the magnetic field
Plotting compass method
- lay a bar magnet on a sheet of paper
- move the plotting compass around the magnet marking the start and finish of the compass arrows.
- join the dots to show the field lines - 6Physics Experiments Describe an experiment to determine the speed of sound in air - using echoesusing echoes
- stand a long distance from a wall (more than 50m) where there are no other buildings near by
- use a long tape measure to measure the distance to the wall
- point a loudspeaker at the wall and use it to make a short loud sound
- use a stopwatch to time how long it takes for the echo to come back
- calculate the speed using speed=distance/time, making sure your remember that the sound has travelled to the wall AND back. - 7Physics experiments describe an experiment to determine the speed of sound in air - using a visual indicationusing a visual indication
- have two people stand a long distance away from each other (more than 200m) where there is a clear line of sight between them
- use a long tape measure to measure the distance between the people
- the first person makes a loud noise in such a way that the second person can see the sound being made e.g. a gunshot
- the second person uses a stopwatch to time how long it takes from them seeing the sound being made to hearing the sound.
- calculate the speed using speed=distance/time.
- this method assumes that the speed of light is infinite and also that there is no wind. To eliminate the effect of wind the people should exchange positions and repeat the experiment, and average the two speeds calculated.
- note; we use a long distance to give the person starting the stopwatch time to react. - 8Physics experiment Describe a simple experiment to show the production and detection of electrostatic charges - repulsion- rub two strips of polythene with a cloth to charge them
- suspend one of them from a thread such that it can rotate freely
- bring the other strip towards it
- the strip should be repelled due to the like charges - 9Physics experiment Describe a simple experiment to show the production and detection of electrostatic charges - Electroscope- rub a strip of polythene with a cloth to charge it
- bring the strip of polythene near the cap of an electroscope
- the leaf of the electroscope will be repelled - 10Physics experiment Describe a simple experiment to show the production and detection of electrostatic charges - picking up paper- rub a strip of polythene with a cloth to charge it
- bring the charged strip of polythene near small pieces of paper
- the pieces of paper will be attracted to the charged strip - 11Physics Experiments Describe an experiment to determine resistance using a voltmeter and an ammeter- set up a series circuit containing the resistance to be measured, a variable resistor, an ammeter, and a voltmeter connected across the resistance to be measured.
- start with the variable resistor at its lowest resistance
- record the current and voltage
- adjust the variable resistor to obtain a new value for the current
- record the current (i) and the voltage (v)
- repeat until SEVEN readings have been obtained
- plot a graph of v (y-axis) and i (x-axis)
- the gradient of the graph will be the resistance - 12Physics Experiments describe an experiment that shows that a changing magnetic field can induce an e.m.f current in a circuit - straight wire and magnet (u-shaped) - bar magnet and coilstraight wire and magnet
- connect a sensitive ammeter in series with a length of wire.
- move the wire rapidly in the magnetic field between the poles of a U-shaped magnet
- the ammeter will show that a current has been induced.
Bar magnet and coil
- connect a sensitive ammeter in series with a coil with a large number of turns
- move the magnet rapidly in and out of the coil
- the ammeter will show that a current has been induced - 13Physics Experiments Describe an experiment showing that force acts on a current-carrying conductor in a magnetic field, including the effects of reversing: i) the current ii) the direction of the field- suspend a wire vertically to pass through poles of a u-shaped magnet
- apply a potential difference across the ends of the wire
- the motor effect will cause the wire to jump to one side
- reverse the p.d.to see that the wire jumps in the opposite direction
- reverse the magnetic field to see that the wire jumps in the opposite direction - 14Physics Experiments Describe the determination of the density of an irregularly shaped solid by the method of displacement, and make the necessary calculation- use a balance to find the mass of the solid
- drop the mass into a known volume of water in a measuring cylinder
- record the new volume shown by the measuring cylinder
- calculate the volume of the solid by subtracting the original volume fro the new volume shown by the measuring cylinder.
- calculate the density from the calculation density = mass/volume - 15Physics Experiments Perform and describe an experiment (involving vertical forces) to show that there is no moment on a body of equilibrium- balance a 60cm ruler at it's centre, adding plasticine to one side or the other until it is horizontal
- hang unequal loads from either side of the ruler and alter their distances from the centre until the rule is balanced
- record the mass and the distance from the pivot (fulcrum)
- repeat with different masses and distances
- the ruler should be balanced in each case when the sum of the anticlockwise moment equals the sum of the clockwise moment
force X distance = force X distance - 16Physics Experiments Describe an experiment to measure the specific heat capacity of a substance- take a mass of 1kg of water (or whatever substance is being tested)
- measure the temperature of the water with a thermometer and record it
- insert an electric heater completely into the water and heat the water for five minutes
- continue to stir the water until the temperature stops rising
- record the final temperature of the water
- calculate the energy received by the water using the equation energy = power X time
- calculate the specific heat capacity using the equation:
specific heat capacity (C) = energy received / (mass X temperature rise) - 17Physics Experiments Describe an experiment to measure specific latent heats for steam and for ice - latent heat of vaporisation (steam)latent heat of vaporisation (steam)
- fill an electric kettle with water and use a balance to find the total mass of the kettle plus water
- switch on the kettle
- as soon as the water is boiling start the stopwatch, keeping the kettle switched on.
- boil the kettle for 3 minutes
- use a balance to find the final mass of the kettle plus water
- calculate the mass of the water that has been turned into steam
- calculate the latent heat of vaporisation from the equation:
Lv = (power of kettle X time used) / mass of water turned to steam - 18Physics Experiments Describe an experiment to measure specific latent heats for steam and for ice - latent heat of fusion (ice)latent heat of fusion (ice)
- place a gauze in a filter funnel and cover with lots of crushed ice
- suspend the filter funnel over a beaker using a clamp stand
- insert and electric heater completely into the ice
- use a balance to measure the mass of the beaker and any melted water within it
- start the stopwatch and turn the heater on
- stop the stopwatch after three minutes and record the mass of the beaker and any melted water.
- calculate the mass of water melted in the 3 minutes by the heater
- calculate the latent heat of fusion from the equation:
Lf= (power of heater X time) / mass of ice melted - 19Physics Experiments describe experiments to show the properties of good and bad emitters and absorbed of infra red radiation - Absorbers- take 2 metal plates, one shiny and the other dull black
- stand the plates equal distances away from a switched off radiation heater
- stick coins the outside of each metal plate using melted wax
- switch on the heater
- the plate that is the best absorber of radiation will melt the wax first and that coin will fall off first. - 20Physics Experiments describe experiments to show the properties of good and bad emitters and absorbed of infra red radiation - emitters ( 2 methods)method 1
- fill a Lesley cube with hot water
- use a thermometer to measure the temperature the same distance away from each side of the cube
- the side that is the best emitter will show a larger temperature increase on the thermometer
method 2
- take two glass containers identical apart from one being painted matt black and the other shiny silver
- fill both containers with an equal volume of hot water at the same temperature
- after 5 minutes use a thermometer to measure the temperature o the water in each container
- the one with the coolest temperature will be the best emitter of radiation - 21Physics Experiments Describe an experiment to show the corresponding force on beams of charged particles- set up a source producing charged particles (e.g. an alpha source or beta particles) and a geiger counter
- Create an electric field by placing two parallel charged metal plates opposite each other
- aim the beam of particles through the middle of the electric field
- move the detector across the field to detect any deflection of the beam of particles
*the experiment can also be carried out using a magnetic field rathe than an electric field.
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- Karteikarten am Physics, erstellt von katie mcveigh am 05/05/2015.
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