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Questions and Answers
What principle explains why a swimmer is propelled forward when they push off the wall?
What principle explains why a swimmer is propelled forward when they push off the wall?
- Conservation of Momentum
- Newton's Second Law
- Newton's Third Law (correct)
- Newton's First Law
Which example best illustrates Newton's Third Law?
Which example best illustrates Newton's Third Law?
- A balloon flying away when the air is released (correct)
- A person sliding down a slide
- A skateboarder stopping by pushing against the ground
- A car accelerating when the gas pedal is pressed
Why is Newton's Third Law significant in engineering design?
Why is Newton's Third Law significant in engineering design?
- It predicts the time taken for an object to reach a certain velocity.
- It ensures that all forces acting on a system are balanced.
- It allows for designing structures that can withstand forces. (correct)
- It helps calculate speed and acceleration.
In the context of jumping, what force acts in response to a person's legs pushing down on the ground?
In the context of jumping, what force acts in response to a person's legs pushing down on the ground?
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When you push a door open, which statement accurately describes the forces involved?
When you push a door open, which statement accurately describes the forces involved?
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Study Notes
Newton's Third Law of Motion
- For every action, there is an equal and opposite reaction.
- This means that whenever one object exerts a force on a second object, the second object exerts an equal and opposite force back on the first object.
- Examples of this law in action include swimming, jumping, rocket launches, car movement, and walking.
- In swimming, a swimmer pushing off the wall experiences an equal and opposite force propelling them forward.
- When jumping, the force exerted by the legs on the ground results in an upward force that launches the person into the air.
- Rocket launches rely on the burning fuel pushing down on the ground, which in turn pushes back up on the rocket with an equal and opposite force, propelling it upwards.
- Pressing the gas pedal in a car creates a force that propels the car forward due to the equal and opposite force from the road.
- Walking is possible because of the equal and opposite forces between the foot and the ground.
- Engineers apply this principle in designing various structures and machines like rockets, airplanes, door knobs, and rifles.
- It is a fundamental concept in physics with numerous practical applications in our daily lives and various fields.
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