shm

Question 1

what is the name given to the physical phenomenon when caused by a periodic driving force

Answer 1

forces oscillations

Question 2

under what conditions can forced oscillations on a structure become hazardous

Answer 2

*structure has its own natural frequency
*becomes dangerous when the driving force is at the same frequency as the natural frequency
*because the structure starts to resonate
*when structure resonates there are large amplitudes vibration produces or Theres a large energy transfer to the structure
*which could damage the structure

Question 3

suggest two ways you could reduce size of oscillations of a bridge

Answer 3

*stiffen the bridge
*install shock absorbers

Question 4

how can you work out the total number of oscillations

Answer 4

divide the total time by the time period

Question 5

what equation is used for masses on a spring in SHM

Answer 5

T=2π √m/k

Question 6

how can you work out the maximum speed of an oscillation

Answer 6

mgh=0.5mv^2

Question 7

what equation could you use to work out the tension at the lowest point of the swing

Answer 7

F-mg=mv^2/l

Question 8

what conditions are needed form SHM to be satisfied concerning the acceleration

Answer 8

*acceleration proportional to the displacement
*acceleration in the opposite direction to displacement

Question 9

explain why when body Is moving in SHM an equation of a = -kx must be satisfied

Answer 9

*shm defined as acceleration proportional to displacement
*minus sing must be used becausee acceleration is in the opposite direction to displacement

Question 10

state what is meant by SHM

Answer 10

*acceleration proportional to displacement
*acceleration is in opposite direction to the displacement