Week 4 Shirley's Blog
Lab: This week, we reviewed what is the Acceleration, velocity, and speed. And talked more about what is friction. Which mentioned on last week's lecture:
-Friction is a force that sliding across a surface
-Magnitude depends upon:
1. Types of surfaces (stickiness, roughness)
2. How hard the surfaces are pushed together.
Then we talked about how the force affect on the baby who is slay on the slide.
What affects how long it takes a swing to go back and forth?
-How hard you push
-Pumping legs
-Kicking off the ground
-Body position
-Initial angle of release
-Weight of rider
-Length of chain
-Windy
We gave the different push each time
Soft push: 1. 10.40/ 10 swing
2. 9.49/10 swing
Hard Push: 1. 7.10/ 10 swing
2. 6.98/ 10 swing
Then we got, the harder we push, the faster the speed of the swing for the result.
Lecture:
Newton's First Law
-Without an (unbalanced external force, an object will maintain its speed and direction of motion.
-Force (push/Pull) is required to speed up slow down, or turn.
Newton's Second Law
-F=ma
-Larger masses are harder to accelerate
The Energy lens on motion
-Energy is manifest in many ways, for example
: movement, light, heat, electricity
: movement, light, heat, electricity
-Energy can be transferred from one system to another.
-Energy is never created nor destroyed.
Swings
-Period does not depend on rider weight
-Period does depend on chain/rope length
-Longer swing means longer period
Pressbook: Pendulums and the Energy Lens on Motion
-Pendulum Definition: A pendulum is a weight suspended from a fixed point that can swing freely.
-Pendulum swing back and forth in a regular motion.
-The pendulum has potential energy.
-As the pendulum swings downward, its potential energy is converted into kinetic energy.
- Longer string=slower swing, fewer periods in 10 seconds
- Shorter string=faster swing, more periods in 10 seconds
Swings are an easy way to see pendulums in real life.
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