Class 11 Physics simulations · Motion in a Straight Line

Rain and the tilted umbrella

Walk through vertical rain and find the umbrella tilt that keeps you dry using relative velocity.

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What to notice

In the walker’s frame the rain slants toward them, so the umbrella must lean forward.

Key relation

v_rain,you = v_rain − v_you ; tan θ = v_you / v_rain

Try this

Walk faster with the same rain speed. How does θ change?

What you can change

• Rain speed (vertical): 2 to 15 m/s
• Walking speed: 0 to 8 m/s

More in Motion in a Straight Line

• Average vs instantaneous velocity
• Reaction and braking distance
• The catch-up problem
• Motion in one dimension
• Relative velocity
• Vertical throw and the turning point
• Area under a v–t graph

See all Class 11 Physics simulations or every Physica simulation.