Mon Prof Augmenté
Pucks sliding on smooth ice
Age 15 · Science
A puck on smooth ice covers the same distance in every equal time interval because nothing changes its motion. When a push acts against it, the gaps shrink as it slows down.
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Age 15: open this week
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In the picture
- A puck on ice: equal spacing between positions shows constant speed
- An arrow of constant length: the speed stays the same when forces balance
- A puck in the bottom row: positions bunch together as it slows
- A shrinking arrow: a net force against the motion reduces the speed
Examples
- A hockey puck gliding across the ice far from the boards
- A passenger lurching forward when a bus brakes suddenly
Key takeaways
- An object at rest or in straight-line motion at constant speed keeps that state if the net force on it is zero.
- A non-zero net force is what changes speed or direction.
Quiz: Pucks sliding on smooth ice (Age 15)
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A puck slides on smooth ice and covers the same distance every second. What does this tell you about the forces on it?
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A puck’s positions get closer together as time passes. What must be acting on it?
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According to the inertia principle, what does a non-zero net force do to an object?
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