🎶 Just Keep Spinning. Just Keep Spinning 🎶
Karen Lu and Avery Holt
Left-handed: counter clockwise
Motion in Discus
- Discus flies flat in the air
- Rotational motion is used to build up speed
- Linear motion from back of throwing circle to the front
1st Law of Motion
- When the discus is stationary, the forces acting upon it is balanced. When the disc is released from the athlete’s hands, its forces become unbalanced because it’s in motion. When it finally hits the ground, friction allows the disc to come to a full stop, making the forces balanced again.
2nd Law of Motion
- The greater the mass of the object, the greater the amount of force needed to accelerate the object. A discus has a mass of 2kg for men and 1kg for women. In order to throw the disc, you have to apply force on it to make the forces unbalanced.
Speeds and Velocities
- Potential→Kinetic: When an athlete winds up, they have potential energy. Then the energy is pushed through the legs, then to the hips, and though the arms flinging the disc into the air giving the disc kinetic energy.
- Mechanical→Heat: When the disc is travelling through the air, it is mechanical energy. When it hits the ground, there is friction, heat energy, stopping the disc completely.
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