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1 Energy

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A coconut is about to fall from a palm tree.

Complete the sentences. Choose answers from the box.

\text{elastic potential} \quad \text{gravitational potential} \quad \text{kinetic} \quad \text{chemical}

As the coconut falls towards the ground, there is a decrease in its __________ energy.

As the coconut falls towards the ground, there is an increase in its __________ energy.

[2]

Write down the equation which links kinetic energy ( $E_k$ ), mass ( $m$ ), and speed ( $v$ ).

[1]

At the instant just before the coconut hits the ground, the kinetic energy of the coconut is $J48\text{ J}$ .

The speed of the coconut is $m/s8.0\text{ m/s}$ .

Calculate the mass of the coconut.

[3]

When the coconut hits the ground, most of its kinetic energy is transferred to the ground.

How does this affect the thermal energy of the ground?

[1]

1 Energy Questions