18.3- MORE ABOUT SINE WAVES

Question 1

Comparing SHM with circular motion- what is the projector used to do?

Answer 1

cast shadow of ball in uniform circular motion onto screen alongside shadow of oscillating bob

Question 2

Comparing SHM with circular motion- when do the two shadows keep up with each other? (2)

Answer 2

keep up with each other exactly when their time periods matched
at any instant have same horizontal motion

Question 3

For any object oscillating at frequency f in SHM, what is the equation for acceleration a using displacement x?

Answer 3

a = -ω²x

Question 4

Equation for displacement x using t?

Answer 4

x=Acos(ωt)