Energy changes in a system, and the ways energy is stored before and after such changes

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Question 13

Medium

An electric scooter is traveling along a straight, level path at a constant speed.

Complete the sentences:

As the scooter travels, the ____________ energy store of its battery decreases.
The speed of the scooter is constant when the work done by the motor is ____________ the work done against resistive forces.

[2]

Figure 1 shows how the speed of this electric scooter changes as the power output of its motor changes.

A graph showing Speed in m/s on the y-axis and Power output in watts on the x-axis.

Write down the equation that links power, time, and work done.

[1]

Calculate the work done by the motor when its power output is $W350\text{ W}$ for $seconds1200\text{ seconds}$ . Keep your answer in joules ( $J\text{J}$ ).

[2]

Using the graph in Figure 1, calculate the percentage increase in speed of the scooter when the power output changes from $W200\text{ W}$ to $W400\text{ W}$ .

[3]

The maximum speed of this scooter on a level road is $m/s16\text{ m/s}$ . Explain how driving uphill affects the maximum speed of this scooter.

[2]

Energy changes in a system, and the ways energy is stored before and after such changes

Question 13

Energy changes in a system, and the ways energy is stored before and after such changes Questions

Energy changes in a system, and the ways energy is stored before and after such changes

Question 13

Energy changes in a system, and the ways energy is stored before and after such changes Questions