# Mini-Quiz: Derivation of Displacement-Time Gravity Equations

by Ron Kurtus (revised 7 January 2011)

Take this Mini-Quiz to check your understanding of the lesson material.

1. What is the starting point for deriving the gravity equation for displacement in a given time?

Start by measuring the displacement

Start with the equation v = gt + vi

You must decide whether to throw the object up or down

2. Why must you do two integrations to find y?

It is a way of double-checking your answers

Distance always requires doing integration two times

You integration both the left and right sides of the equal sign

3. How is the equation gt2 + 2vit − 2y = 0 solved for t?

By using the formula for solving quadratic equations

By trial and error

You first solve for g and then substitute in values for t

If you got all three correct, you are on your way to becoming a Champion in Physics. If you had problems, you had better look over the material again.

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mini-quiz_gravity_derivations_displacement_time.htm

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