Mon Prof Augmenté
Puck on Ice and Balanced Crate
Age 15 · Physics
A puck slides across a smooth ice rink while four markers show equal spacing along its straight path. Beside it, a crate has two equal arrows pushing in opposite directions.
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Age 15: open this week
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In the picture
- Puck on the ice: its motion continues in a straight line at constant speed.
- Evenly spaced marker: equal distances between markers mark equal time intervals.
- Crate at rest: balanced forces leave it at rest.
- Left arrow: one of two equal forces acting on the crate.
- Right arrow: the opposite equal force acting on the crate.
Examples
- A hockey puck gliding across ice after a light push.
- A book lying still on a table while gravity and the table push equally.
Key takeaways
- With balanced forces, a body at rest stays at rest.
- With balanced forces, a moving body keeps a straight path at constant speed.
Quiz: Puck on Ice and Balanced Crate (Age 15)
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If the forces on an object are balanced and the object is at rest, what will it do?
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If the forces on a moving object are balanced, how will it move?
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What do equal distances between markers in equal time intervals show about the puck’s motion?
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