## Mastering Physics Solutions: Question 4.10

Question 4.10

Part A = The magnitude of the force of the brick on the glass is equal to the magnitude of the force of the glass on the brick.

Solution Below:

Part A

A brick hits a glass window. The brick breaks the glass, so:

• The magnitude of the force of the brick on the glass is greater than the magnitude of the force of the glass on the brick.
• The magnitude of the force of the brick on the glass is equal to the magnitude of the force of the glass on the brick.
• The magnitude of the force of the brick on the glass is smaller than the magnitude of the force of the glass on the brick.
• None of the preceding

Newton’s 3rd Law says that for every action there is an equal and opposite reaction. So options A and C are incorrect. Option B is correct according to Newton’s 3rd law (equal and opposite forces). So option D is wrong and:

The magnitude of the force of the brick on the glass is equal to the magnitude of the force of the glass on the brick.

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