Solution ✔ Verified
- A1 and 3
- B2 and 4
- C1, 2 and 4
- D2, 3 and 4
Explanation
Kicking a football involves muscular force (contact force). Compass needle aligning involves magnetic force (non-contact force). Air resistance is a type of frictional force (contact force as air particles touch the object). An apple falling involves gravitational force (non-contact force). Therefore, only situations 2 and 4 involve primarily non-contact forces.
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