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

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Equations of Motion
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What is the value of gravitational acceleration used in vertical projectile motion?

9.8 m s−29.8 \,\mathrm{m\,s^{-2}}

What is the velocity of a projectile at its maximum height?

0 m s−10 \,\mathrm{m\,s^{-1}}

Which equation is best when time is not given or needed?

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

If upward is chosen as positive, what is the value of gg?

−9.8 m s−2-9.8 \,\mathrm{m\,s^{-2}}

What does Δx\Delta x represent in the equations of motion?

Displacement (change in position)

Which equation links displacement, average velocity and time?

Δx=(vi+vf)2 t\Delta x = \frac{(v_i + v_f)}{2} \, t

Which equation does NOT contain time as a variable?

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

If total flight time is 10 s, what is the time to reach maximum height?

5 s

What strategy should you use when selecting an equation to solve a problem?

Choose equation with fewest unknowns

In which direction does gravitational acceleration always act?

Downward

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