Slide 1

Slide 2

In an oscillating spring, where is the maximum acceleration achieved?

Slide 3

Answer: At the maximum displacement positions

Slide 4

When the spring is stretched and released, what direction does the spring force act?

Slide 5

Toward the equilibrium position

Slide 6

When the spring is stretched and released, when is speed equal to 0?

Slide 7

Answer: at the point of maximum displacement.

Slide 8

Often, the negative sign in Hookes Law is ignored... Why is this possible?

Slide 9

Answer: because the sign indicates that the force and displacement are in opposite direcitons

Slide 10

What are the units for k?

Slide 11

Answer: N/m

Slide 12

When using Hookes Law, what units does the displacement value need to be in?

Slide 13

Answer: meters

Slide 14

In an oscillating system, where is the greatest kinetic energy located?

Slide 15

Answer: At the equilibrium positon

Slide 16

If the mass of a pendulum cut in half, what happens to the period?

Slide 17

Answer: no change, mass does not affect the period of a pendulum

Slide 18

If the length of a pendulum is increased by 16 times, what happens to the period?

Slide 19

Answer: increases 4 times longer

Slide 20

If a pendulum clock keeps perfect time at the base of a mountain, will it also keep perfect time when moved to the top of the mountain? Why.

Slide 21

No, the gravity is slightly different so the period will change also

Slide 22

The moons gravity is 1/6 of Earth. If a mass spring system with a mass of 2 kg has a period of 3 sec on Earth, what will be the period on the moon?

Slide 23

3 sec, gravity does not affect mass- spring systems.

Slide 24

If you know the cycles and time, how do you find frequency?

Slide 25

Cycles divided by sec

Slide 26

Given period, how do you find frequency?

Slide 27

1 divided by the period, they are recipricals

Slide 28

If a grandfather clock is running slow, how can you adjust the length of the pendulum to correct the time?

Slide 29

Shorten the length to shorten the period

Slide 30

Problems

Slide 31

If a force of 50 N stretches a spring.10 m, what is the spring constant?

Slide 32

500 N/m

Slide 33

A mass on a spring vibrates in simple harmonic motion at an amplitude of 8.0 cm. If the mass of the object is.20 kg and the spring constant is 130 N/m, what is the frequency?

Slide 34

4.0 Hz

Slide 35

On the planet Xenos, an astronaut observes that a 1.00 m long pendulum has a period of 1.50 s. What is the free-fall acceleration on Xenos?

Slide 36

17.5 m/s 2

Slide 37

A pendulum goes past the equilibrium position once every 2 seconds, what is frequency of the pendulum?

Slide 38

.25 Hz