Figure 5 is an incomplete ray diagram representing a visitor standing near the security lens. Complete Figure 5 to show how an image of the visitor is formed by the concave lens. Draw an arrow to represent the image. The visitor moves further away from the security lens in the door. How does the size of the image change? Tick (✓) one box. Decreases Increases Stays the same Which material should the bolt be made from? Tick (✓) one box. Aluminium Brass Copper Iron Explain why the door unlocks when the switch is closed. When the door unlocks, a force of 2.88 N is applied to the spring. The spring extends by 1.50 cm. Calculate the spring constant of the spring. Spring constant = ________ N/m Give two ways the resultant force on the bolt could be increased. 1 2

GCSE AQA Physics Forces & Elasticity: Figure 5 is an incomplete ray di

Figure 5 is an incomplete ray diagram representing a visitor standing near the security lens - AQA - GCSE Physics - Question 4 - 2020 - Paper 1

Question 4

Figure 5 is an incomplete ray diagram representing a visitor standing near the security lens. Complete Figure 5 to show how an image of the visitor is formed by the... show full transcript

Worked Solution & Example Answer:Figure 5 is an incomplete ray diagram representing a visitor standing near the security lens - AQA - GCSE Physics - Question 4 - 2020 - Paper 1

Step 1

Complete Figure 5 to show how an image of the visitor is formed by the concave lens.

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Answer

To complete the diagram, draw two lines originating from the top of the visitor's head:

One line travels towards the lens and then diverges outward, representing the refracted rays from the concave lens.
Draw another line directly through the center of the lens to show the path of light that continues unbent. Mark the point where these lines seem to converge to indicate how the image is formed. Finally, depict an arrow pointing downward to represent the image of the visitor.

Step 2

How does the size of the image change?

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Answer

The size of the image decreases as the visitor moves further away from the security lens.

Step 3

Which material should the bolt be made from?

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Answer

The bolt should be made from iron because it has good magnetic properties, allowing it to be attracted by the electromagnet created by the solenoid.

Step 4

Explain why the door unlocks when the switch is closed.

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Answer

When the switch is closed, an electric current flows through the solenoid or circuit, creating a magnetic field. This magnetic field magnetizes the solenoid, which attracts the bolt, thereby unlocking the door.

Step 5

Calculate the spring constant of the spring.

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Answer

To calculate the spring constant (k), use Hooke's Law, which states that the force (F) is equal to the spring constant (k) multiplied by the extension (x):

$F = k imes x$

Given:

Force, F = 2.88 N
Extension, x = 1.50 cm = 0.015 m

Rearranging the formula gives:

$k = \frac{F}{x} = \frac{2.88 \, \text{N}}{0.015 \, \text{m}} = 192 \, \text{N/m}$

Thus, the spring constant is 192 N/m.

Step 6

Give two ways the resultant force on the bolt could be increased.

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Answer

Increase the current flowing in the solenoid or circuit, which strengthens the magnetic field.
Add more turns to the solenoid, which increases the magnetic field strength proportionally.

Figure 5 is an incomplete ray diagram representing a visitor standing near the security lens - AQA - GCSE Physics - Question 4 - 2020 - Paper 1

Worked Solution & Example Answer:Figure 5 is an incomplete ray diagram representing a visitor standing near the security lens - AQA - GCSE Physics - Question 4 - 2020 - Paper 1

Complete Figure 5 to show how an image of the visitor is formed by the concave lens.

How does the size of the image change?

Which material should the bolt be made from?

Explain why the door unlocks when the switch is closed.

Calculate the spring constant of the spring.

Give two ways the resultant force on the bolt could be increased.

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