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Answer:
Here is the analysis of the forces involved in each situation:
1. Hitting a ball with a bat: CF (Contact Force) – The bat exerts a force on the ball through physical contact.
2. Two magnets repelling each other: NCF (Non-Contact Force) – The repulsive force between the magnets occurs without physical contact, due to the magnetic field.
3. Pedaling a bicycle: CF (Contact Force) – The force applied by the rider’s legs on the pedals is transmitted through contact.
4. Gravity pulls you toward the ground: NCF (Non-Contact Force) – Gravity acts at a distance without physical contact.
5. Pulling a door open: CF (Contact Force) – The force applied to the door handle involves physical contact.