Jessica's weight is 540 newtons. According to the Third Law, if the Earth pulls on Jessica with a force of 540 N, then Jessica pulls on the Earth with a force of 540 newtons that acts in the opposite direction. However, if Jessica stumbles while rollerblading, she will fall down to the ground. Explain why this happens.
The gravitational force on Jessica is pulling her toward the center of the earth.
That force is resisted by the equal and opposite force the ground exerts up on the rollers.
The gravitational force on earth is pulling the earth toward Jessica. However is is balanced by the force Jessica's rollers exert down on earth.
If Jessica is no longer held away from the earth by the force up on her rollers, then a = Mjessica/g and she accelerates toward the center of earth.
The earth also accelerates toward Jessica while she is in the air, but the earth mass is so large that this acceleration is not detectable.
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When Jessica stumbles while rollerblading and falls down to the ground, it happens because the force she exerts on the Earth is not sufficient to keep her upright and counteract the force of gravity pulling her downwards.
The force of gravity, which is the weight of Jessica, acts on her vertically downward towards the center of the Earth. In this case, the weight of Jessica is 540 newtons. According to Newton's Third Law of Motion, there is an equal and opposite force at play. So, she also exerts a force of 540 newtons on the Earth, acting in the opposite direction (vertically upward).
Now, while rollerblading, Jessica needs to exert additional forces on the ground to maintain her balance and prevent falling. These forces are produced by the friction between the wheels of her rollerblades and the ground. These forces, known as the normal force, act perpendicular to the ground and help support her weight by pushing her upward.
However, when Jessica stumbles, her balance is compromised, and she fails to exert sufficient force on the ground to oppose the force of gravity. As a result, the normal force decreases, potentially becoming too weak to support her weight fully. Consequently, gravity overpowers the insufficient normal force, causing Jessica to fall downwards, eventually leading to her coming into contact with the ground.
In summary, when Jessica stumbles, her inability to maintain sufficient normal force on the ground causes the overpowering force of gravity to pull her down and ultimately result in her falling to the ground.