Work Done & GPE of a Projectile (without air resistance)

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8 Terms

1
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What is Energy?

A fundamental concept in science; present in various forms with endless conversion. Transferred/converted when work is done.

2
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What is Work Done by a Force?

The product of the force and the displacement in the direction of the force (W = Fs).

3
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How is Gravitational Potential Energy (GPE) derived from work done?

Work done by an external force lifting a body against gravity results in a gain in GPE.

4
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What is the equation for Gravitational Potential Energy (GPE) changes in a uniform gravitational field?

ΔE_p = mgΔh.

5
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What is the significance of the absolute value of GPE (E_p = mgh)?

It is arbitrary; the reference point for h can be chosen freely.

6
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What is the important quantity in GPE calculations?

The change in GPE (ΔE_p) due to a change in position, not its absolute value.

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What forms of energy does a body possess during projectile motion (without air resistance)?

Kinetic energy (due to speed) and gravitational potential energy (due to position).

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What is the principle of Conservation of Energy (without air resistance)?

Any increase in GPE must be accompanied by a decrease in kinetic energy, and vice versa.