Ramps and Rolling
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flagWhat you'll discover
- arrow_forwardShow that a steeper ramp makes a ball speed up faster
- arrow_forwardExplain that gravity is the force pulling the ball down the slope
- arrow_forwardDiscover that friction can slow the ball — or stop it rolling completely
- arrow_forwardUse a timer to compare races like a real scientist
Why does the ball roll down?
Gravity pulls everything straight down towards the centre of the Earth. On a ramp, part of that pull drags the ball along the slope, so the ball rolls downhill all by itself — no push needed!
The steeper the ramp, the bigger the share of gravity pulling along the slope, so the ball speeds up faster. On a totally flat floor the slope-pull is zero, and the ball just sits there.
Steeper means faster
Try the angle slider and watch the race timer. At a gentle 10° the ball takes its time, but at 40° it finishes in a flash. The ramp angle controls the acceleration — how quickly the ball gains speed.
This is exactly why playground slides feel faster when they are steeper, and why cyclists in the hills of Nepal go whoosh on the way down but have to pedal hard on the way up!
Friction joins the race
Friction acts between the ball and the ramp, pushing back up the slope against the rolling. A little friction just makes the race slower. But here is the cool part: if the friction is strong enough and the ramp is gentle enough, the ball will not move at all!
Slide the friction up high and the angle down low, then press Go. The readout shows the acceleration dropping to zero — the ball is stuck. Now you know why rough surfaces are great for stopping things.