AS and A Level: Fields & Forces
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Investigating the forces acting on a trolley on a ramp
5 star(s)Finally, the angle of the ramp was altered and the measurements taken again for three different angles. By measuring the vertical height at the point where the light gate was and a fixed distance from this, it was possible to calculate the exact angle at which the ramp rested by using simple trigonometry. Theory There were two ways to approach the experiment. It is possible to calculate gravity (g) by considering the 'conservation of energy', which calculates the gravitational potential energy of the trolley and uses this information to find the acceleration of the trolley. In this experiment, the variable is the vertical component of the ramp.
 Word count: 5816

paper cones investigation
5 star(s)air C Displacement of fall C Time taken to fall D Prediction Since the theory suggests that So the square of time should be directly proportional to the inverse of mass. A straight line graph of t2 versus m1 should give a straight line graph with a gradient of All of these values will be measurable or known, except for the drag coefficient, c. Method Preliminary experiments Determining a size of the paper cone: Three unweighted paper cones were constructed from A4 paper and selotape: w is the width (diameter)
 Word count: 2095

The Compound Pendulum
5 star(s)* 'h' is the distance of the pivot from the centre of gravity in metres  independent variable * 'g' is the acceleration due to gravity  dependant variable By plotting T against h at this point, the graph will be a parabola. This is because T is proportional to h, and the equation is not in the form of y = mx + c, in which case the graph would be a straight line. The above equation can also be written including the mass of the pendulum.
 Word count: 1972

Falling parachute experiment
4 star(s)The object will accelerate to higher speeds before reaching a terminal velocity. Thus, more massive objects fall faster than less massive objects because they are acted upon by a larger force of gravity; for this reason, they accelerate to higher speeds until the air resistance force equals the gravity force [1]. Method The apparatus used in the experiment are a plastic bag, scissors, a set of 5 paperclips, a ruler, stopwatch or wristwatch with ability to read to at least 0.1 s, notebook and pencil.
 Word count: 766

Investigate four factors that may affect the strength for electromagnets: the number of turns, the size of the current, the nature of the current (a.c. or d.c.) and the distance between the sensor and the magnet.
4 star(s)3 Connect the circuit as the diagram showed. 4 Twine the wire on the magnet with 20 turns. 5 Turn on the switch and record 5 successive readings on the graphical calculator as 'X1 T' (since the reading changes all the time) 6 Turn off the switch and change only and increase the number of turns on the magnet by 10 turns. 7 Turn on the switch and record the new 5 successive readings on the graphical calculator as 'X2 T' 8 Repeat step 6&7 for another 4 times and correlatively get X3 X4 X5 X6 T. Part 2: Size of the current 1 Measure the room temperature and record as 't'.
 Word count: 1503

Determination of the acceleration due to gravity (g)
4 star(s)this investigation, I am going to determine the acceleration due to gravity on the earth by using an electronic timer and varying its height of dropping. In this method, a steel ball is hold by a free fall adaptor (ball release mechanism) , when we release the ball, the current to the circuit is switched on and the ball begins to fall. At the same time an electronic timer starts. The ball falls through a receptor pad and this will break down the circuit to stop the electronic timer.
 Word count: 2347