21. Jenny performs an experiment to measure the acceleration due to gravity (g). The results are presented in the below: (note: timing procedure was done for 20 oscillations)

Time taken for 20

oscillations t(s)

15.5 20.1 23.7 26.9 29.8 32.4

Length l(m) 0.15 0.25 0.35 0.45 0.55 0.65

Time Period T(s) 0.775

T

2 (s2

) 0.60

a. Complete the table above (8 marks)

b. Plot a graph of T2

against l. (10 marks)

c. Determine the gradient of the graph (5 marks)

d. Given that gradient = 39.4/g, determine the acceleration due to gravity g. (4 marks)

22. Complete the following table of Fundamental Quantities: (10 marks)

Quantity Symbol Unit Symbol Measuring Instrument

Time

m

Ampere

K

Meter ruler

23. Describe a method that could be used to determine if changing angle of displacement

would affect the period of oscillation of a simple pendulum. (12 marks)

(Note: you may use a diagram in this section)

Learning goal: to understand newton's 1st law. newton's principia states this first law of motion: an object subject to no net force maintains its state of motion, either at rest or at constant speed in a right line. this law may be restated as follows: if the sum of all forces acting on an object is zero, then the acceleration of that object is zero. mathematically this is just a special case of the 2nd law of motion, f⃗ =ma⃗ , when f⃗ =0. when studying newtonian mechanics, it is best to remember the 1st law in two ways: if the net force (i.e., sum of all forces) acting on an object is zero, the object will keep moving with constant velocity (which may be zero). if an object is moving with constant velocity, that is, with zero acceleration, then the net force acting on that object must be zero. complete the following sentences to see if you can apply these ideas. part a if a car is moving to the left with constant velocity, one can conclude that