10A.1 Simple Harmonic Motion

Question 1

what is oscillate

Answer 1

to undertake continuously repeated movements

Question 2

what is period

Answer 2

the time taken for one complete oscillation

Question 3

what is simple harmonic motion

Answer 3

the oscillation of a system in which a force is continually trying to return the object to its center position, and this force is proportional to the displacement from that centre position

Question 4

the force acting in SHM is called the

Answer 4

restoring force

Question 5

The restoring force in SHM is = to

Answer 5

F = -kx where k is a constant that depends on the oscillating system in question

Question 6

why is the restoring force equation negative

Answer 6

to show that acceleration will always be towards the centre of the oscillation

Question 7

what is the equation for the period of the oscillations of mass M, subject to Hooke’s law restoring force is

Answer 7

T = 2pi√m/k

Question 8

a pendulum’s time period is independent of

Answer 8

the size of the oscillation

Question 9

time period of a pendulum =

Answer 9

T = 2pi√l/g where the time period is only dependent on the length of the string and the strength of the gravity on that planet which it has been set up

Question 10

what sensor do we use to find details about the oscillation of a pendulum and what are the details we can find

Answer 10

ultrasonic position vectors, where it can give us detailed d/t graphs and from calculations of change in poisition / time taken between readings we can find a v/t graph (the calculations are done by an ultrasonic datalogging sensor)

Question 11

how can we convert a D/t graph to a v/t graph and why is that possible

Answer 11

we convert by differentiation and it is possible because the gradient in any part of the d/t graph equals the velocity at that moment

Question 12

what is the amplitude in SHM

Answer 12

the maximum displacement from from the center position

Question 13

a pendulum will always have zero velocity at

Answer 13

the amplitude displacement and the same position at the other side of the swing

Question 14

where does maximum velocity of a pendulum occur

Answer 14

at the middle of the swing where their is zero displacement

Question 15

when is the acceleration of the pendulum zero and at maximum and why

Answer 15

the restoring force is proportional to the displacement so the acceleration will be max at the amplitude and minimum in the middle

Question 16

the swings of a pendulum in SHM are

Answer 16

symmetrical

Question 17

if the time period is independent of the amplitude such oscillation are known as

Answer 17

isochronous such as the pendulum

Question 18

how can we investigate the motion of the pendulum

Answer 18

by clamping a stand to a bench then swinging a pendulum form at a known amp and viewing the ultrasonic position sensor results

Question 19

what safety precautions should we follow when investigating a pendulum

Answer 19

1. make sure the stand is camped securely to the bench.
2. use small pendulum and small swings