A student investigated the efficiency of a motor using the equipment in Figure 4. Figure 4 The motor is attached to a pulley which is lifting a weight of 2.5 N to a height of 2.0 m. **05.3** Give two conclusions that could be made from the data in Figure 5? [2 marks] **05.4** Give the main way that the motor is likely to waste energy. [1 mark] **05.4** Give the main way that the motor is likely to waste energy. [1 mark] **05.5** When the total power input to the motor was 5 W the motor could not lift the 2.5 N weight. State the efficiency of the motor. Efficiency = _________%

GCSE AQA Physics Forces & Elasticity: A student investigated the effic

A student investigated the efficiency of a motor using the equipment in Figure 4 - AQA - GCSE Physics - Question 5 - 2018 - Paper 1

Question 5

A student investigated the efficiency of a motor using the equipment in Figure 4. Figure 4 The motor is attached to a pulley which is lifting a weight of 2.5 N to ... show full transcript

Worked Solution & Example Answer:A student investigated the efficiency of a motor using the equipment in Figure 4 - AQA - GCSE Physics - Question 5 - 2018 - Paper 1

Step 1

Give two conclusions that could be made from the data in Figure 5?

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Answer

As speed increases, the efficiency of the motor increases, but tends to approach a maximum value, suggesting it does not exceed 100% efficiency.
Different loads may have varying effects on the motor's performance, as their weight influences how efficiently the motor operates.

Step 2

Give the main way that the motor is likely to waste energy.

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Answer

The motor is likely to waste energy by heating the surroundings, which means some energy is lost as heat rather than being converted to useful work.

Step 3

Give the main way that the motor is likely to waste energy.

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Answer

The motor is likely to waste energy by heating the surroundings, resulting in inefficiencies.

Step 4

State the efficiency of the motor.

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Answer

The efficiency can be calculated using the formula: $ext{Efficiency} = rac{ ext{Useful Power Output}}{ ext{Total Power Input}} imes 100$ .

In this case, the motor could not lift the 2.5 N weight, so the useful power output is 0 W. Thus, the efficiency would be: $ext{Efficiency} = rac{0 ext{ W}}{5 ext{ W}} imes 100 = 0\%.$

Therefore, the efficiency of the motor is 0%.

A student investigated the efficiency of a motor using the equipment in Figure 4 - AQA - GCSE Physics - Question 5 - 2018 - Paper 1

Worked Solution & Example Answer:A student investigated the efficiency of a motor using the equipment in Figure 4 - AQA - GCSE Physics - Question 5 - 2018 - Paper 1

Give two conclusions that could be made from the data in Figure 5?

Give the main way that the motor is likely to waste energy.

Give the main way that the motor is likely to waste energy.

State the efficiency of the motor.

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