A.2 · 7 · A.2 Forces and momentum · big picture (enrichment)
Force: the link between space and time
Imbalance drives motion. Force connects the three dimensions of space with time, and carries the present into the future.
SL+HLMedium14 minFree
Hook
Space has three dimensions and time has one. Is there a single quantity that ties both to the way things change?
Utkarsh laws of motion
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Which pair are BOTH equal to force?
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A constant 6.0 N force acts along a body’s path for 2.0 m. The energy transferred is…
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The same 6.0 N force acts for 2.0 s. The change in momentum is…
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In the imbalance table, what plays the role of the imbalance for an electric current?
Apply
Explain how force connects space and time, using two equations.
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Remember earlier lessons
From lesson A.2 · 2
F_net = …
From lesson A.2 · 5
Which quantity is a scalar?
Summary card
Key points
- • Imbalance is the cause of motion; a bigger imbalance means more motion.
- • Force = work done per unit displacement (space) = change in momentum per unit time (time).
- • Given the present state and the force, the future (and the past) follows.
Formulas
- WD / x = F = Δp / t
Key terms
- Imbalance :
- a difference (of force, concentration, temperature or potential) that drives a flow
- Work done :
- the way energy in one form (E₁) is converted into energy in another form (E₂); a force acting through a displacement
Common errors
- • Mixing up energy per distance (force) with energy per time (power).
- • Forgetting the condition: constant force along the displacement.
- • Treating work done as a store of energy: it is the process that converts E₁ into E₂.
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