# physics

Based on the third law motion of equal and opposite forces, a mass should never accelerate because the net force on it will always be zero. Resolve the issue.

If a force is exerted by object A on object B, then B exerts a force of equal magnitude and in opposite direction on A. So, there is then a net force on A causing A to accelrate. But B accelerates in the opposite direction.

But the center of mass of A and B does not accelerate, because the total force exerted on the combined system A plus B is zero.

Try to solve this problem by making clever use of Newton's third Law:

Given a sphere of uniform density rho and radius R, what is the gravitatonal force that one half of the sphere exerts on the other half?

1. 👍
2. 👎
3. 👁

## Similar Questions

1. ### Physics

Need serious help!! 1. How can the momentum of a moving object be found? A. By multiplying its mass by its acceleration. B. By dividing its change in distance trabeled by the time it travels. C. By dividing its velocity bu the

2. ### Science

๐.) Which term describes how far an object has traveled from its original location? ๐ฐ๐ฝ๐๐๐ด๐: displacement ๐.) What would the position-time graph look like for an object that remains still over time?

3. ### science

1. What is the magnitude of a force? the motion of the force the motion of the force A. the motion of the force B. the amount of force C. the type of force D. the direction of the force 2. Two people push a box from opposite

4. ### Physics (Conservation of momentum)

1. Which of Newtonโs laws of motion states that an object at rest stays at rest and an object in motion stays in motion with the same speed and the same direction unless acted upon by an unbalanced force? A. Newton's Third Law

1. ### Science

1. The line on the graph below represents an object that is: A: Moving at a constant speed B: Increasing its speed C: Decreasing it's speed D: Not moving at all 2. To determine the acceleration of an object moving in a straight

2. ### science

1.A ball bounces on the ground. How do the ball and the ground act on each other? The ball and the ground exert forces on each other with equal magnitude but in opposite directions. The ball exerts a stronger force than the ground

3. ### Science

two people pish a box from the oppisite directions, but the box does not move. Which statement best explains this result? (A) the box pushes back on the people. (B) balanced forces do not cause motion (C) Push forces do not cause

4. ### Physics

a child causes a wagon to accelerate by pulling it with a horizontal force. newton's third law says that the wagon exerts an equal and opposite force on the child. how can the wagon accelerate

1. ### physics

a child causes a wagon to accelerate by pulling it with a horizontal force. newton's third law says that the wagon exerts an equal and opposite force on the child. how can the wagon accelerate? (hint: draw a free-body diagram for

2. ### Physics **HELP PLS**

1. In boxing, fighters wear padded gloves to protect their hands. Which statement explains why a fighterโs hands need protection? A. There is an equal and opposite velocity impact the hand. B. There is an equal and opposite

3. ### Math

Use sine law to explain why the 2 equal sides of an isoceles triangle must be opposite the two equal angles

4. ### science

Lesson 12: Forces and Motion Unit Test Science 8 A Unit 2: Forces and Motion connexus academy can you answer for me pls i need the answers