Equations of Motion (Grade 12 NSC Matric Physical Sciences): Flashcards

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Equations of Motion
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Value of gravitational acceleration gg

9.8 m s−29.8 \,\mathrm{m\,s^{-2}}

Velocity at maximum height in vertical projectile motion

0 m s−10 \,\mathrm{m\,s^{-1}} (always zero)

Equation linking vfv_f, viv_i, gg, and tt

vf=vi+gtv_f = v_i + g t

Time-independent equation for vertical projectile motion

vf2=vi2+2gΔxv_f^2 = v_i^2 + 2 g \Delta x

What does Δx\Delta x represent in motion equations?

Change in vertical position or displacement

Key principle for sign conventions in projectile problems

Choose a positive direction and maintain it throughout

Equation: Δx=vit+12gt2\Delta x = v_i t + \tfrac{1}{2} g t^2 links what?

Displacement, initial velocity, acceleration, and time

What replaces aa in vertical projectile motion equations?

Gravitational acceleration gg

Best strategy when choosing a motion equation to use

Select equation with fewest unknowns

Value of gg when upward is chosen as positive direction

−9.8 m s−2-9.8 \,\mathrm{m\,s^{-2}} (negative)

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