High School Physics : Forces

Study concepts, example questions & explanations for High School Physics

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例子问题tions

例子问题tion #521 :High School Physics

An astronaut has a mass ofand Mars has an acceleration due to gravity of. What is her weight on Mars?

Possible Answers:

Correct answer:

Explanation:

Weight is a very specific force, determined by the acceleration due to gravity acting on a given mass. Using Newton's second law, we can see that weight will be equal to the equation:

We are given the mass of the astronaut and the acceleration due to gravity on Mars. Using these values, we can calculate her weight on Mars.

例子问题tion #3 :Universal Gravitation

Two satellites in space, each with a mass of, areapart from each other. What is the force of gravity between them?

Possible Answers:

Correct answer:

Explanation:

To solve this problem, use Newton's law of universal gravitation:

We are given the constant, as well as the satellite masses and distance (radius). Using these values we can solve for the force.

例子问题tion #4 :Universal Gravitation

Two satellites in space, each with a mass of, areapart from each other. What is the force of gravity between them?

Possible Answers:

Correct answer:

Explanation:

To solve this problem, use Newton's law of universal gravitation:

We are given the constant, as well as the satellite masses and distance (radius). Using these values we can solve for the force.

例子问题tion #6 :Universal Gravitation

Two asteroids in space are in close proximity to each other. Each has a mass of. If they areapart, what is the gravitational force between them?

Possible Answers:

Correct answer:

Explanation:

To solve this problem, use Newton's law of universal gravitation:

We are given the constant, as well as the asteroid masses and distance (radius). Using these values we can solve for the force.

例子问题tion #651 :Ap Physics 1

Two asteroids in space are in close proximity to each other. Each has a mass of. If they areapart, what is the gravitational acceleration that they experience?

Possible Answers:

Correct answer:

Explanation:

Given that, we already know the mass, but we need to find the force in order to solve for the acceleration.

To solve this problem, use Newton's law of universal gravitation:

We are given the constant, as well as the satellite masses and distance (radius). Using these values we can solve for the force.

Now we have values for both the mass and the force, allowing us to solve for the acceleration.

例子问题tion #652 :Ap Physics 1

Two asteroids, one with a mass of和其他与质量, areapart. What is the gravitational force on the LARGER asteroid?

Possible Answers:

Correct answer:

Explanation:

To solve this problem, use Newton's law of universal gravitation:

We are given the constant, as well as the asteroid masses and distance (radius). Using these values we can solve for the force.

It actually doesn't matter which asteroid we're looking at; the gravitational force will be the same. This makes sense because Newton's 3rd law states that the force one asteroid exerts on the other is equal in magnitude, but opposite in direction, to the force the other asteroid exerts on it.

例子问题tion #653 :Ap Physics 1

Two asteroids, one with a mass of和其他与质量areapart. What is the gravitational force on the SMALLER asteroid?

Possible Answers:

Correct answer:

Explanation:

To solve this problem, use Newton's law of universal gravitation:

We are given the constant, as well as the asteroid masses and distance (radius). Using these values we can solve for the force.

It actually doesn't matter which asteroid we're looking at; the gravitational force will be the same. This makes sense because Newton's 3rd law states that the force one asteroid exerts on the other is equal in magnitude, but opposite in direction, to the force the other asteroid exerts on it.

例子问题tion #654 :Ap Physics 1

Two asteroids, one with a mass of和其他与质量areapart. What is the acceleration of the SMALLER asteroid?

Possible Answers:

Correct answer:

Explanation:

鉴于牛顿第二定律, we can find the acceleration by first determining the force.

To find the gravitational force, use Newton's law of universal gravitation:

We are given the constant, as well as the asteroid masses and distance (radius). Using these values we can solve for the force.

We now have values for both the mass and the force. Using the original equation, we can now solve for the acceleration.

例子问题tion #655 :Ap Physics 1

Two asteroids, one with a mass of和其他与质量areapart. What is the acceleration of the LARGER asteroid?

Possible Answers:

Correct answer:

Explanation:

鉴于牛顿第二定律, we can find the acceleration by first determining the force.

To find the gravitational force, use Newton's law of universal gravitation:

We are given the constant, as well as the asteroid masses and distance (radius). Using these values we can solve for the force.

We now have values for both the mass and the force. Using the original equation, we can now solve for the acceleration.

例子问题tion #656 :Ap Physics 1

Two satellites are a distancefrom each other in space. If one of the satellites has a mass ofand the other has a mass of, which one will have the smaller acceleration?

Possible Answers:

Neither will have an acceleration

We need to know the value of the masses to solve

They will both have the same acceleration

Correct answer:

Explanation:

The formula for force and acceleration is Newton's 2nd law:. We know the mass, but first we need to find the force:

For this equation, use the law of universal gravitation:

We know from the first equation that a force is a mass times an acceleration. That means we can rearrange the equation for universal gravitation to look a bit more like that first equation:

can turn into:and, respectively.

We know that the forces will be equal, so set these two equations equal to each other:

The problem tells us that

Let's say thatto simplify.

As you can see, the acceleration foris twice the acceleration for. Therefore the masswill have the smaller acceleration.

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