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5 (a) (i) Figure 9 shows two gears - Edexcel - GCSE Physics - Question 5 - 2018 - Paper 1
Question 5
5 (a) (i) Figure 9 shows two gears. Gear Q moves clockwise as shown by the arrow. Which of these describes how gear P moves? A antclockwise, slower than gear Q B an... show full transcript
Worked Solution & Example Answer:5 (a) (i) Figure 9 shows two gears - Edexcel - GCSE Physics - Question 5 - 2018 - Paper 1
Step 1
Which of these describes how gear P moves?
Answer
To analyze how gear P moves in relation to gear Q, we must keep in mind that when one gear rotates, it causes the adjacent gear to rotate in the opposite direction. Since gear Q is moving clockwise, gear P must move in the opposite direction, which is anticlockwise. Because gear P has more teeth than gear Q (24 teeth vs. 16 teeth), gear P will move slower than gear Q. Therefore, the correct answer is:
A: anticlockwise, slower than gear Q
Step 2
Which of these gives the ratio of the number of teeth on gear P to the number of teeth on gear Q?
Answer
To determine the ratio of the number of teeth on gear P to gear Q, we can set up the ratio as follows:
- Gear P has 24 teeth.
- Gear Q has 16 teeth.
The ratio can be expressed as:
Thus, the correct answer is:
C: 3 : 2