Why do I need less force on a gentle slope?
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Great question — think about a football pitch ⚽
When you dribble the ball up a gentle grassy bank, you're only fighting a slice of gravity: the part that points down the slope, mg·sin θ. Make the bank steeper and that slice gets bigger, so you have to push harder.
At θ = 30° the slice is exactly half the weight:
0.100 kg × 9.8 m/s² × sin 30° = 0.49 N