Careful. They want the net force, not the force that A exerts on B.aruji73 said:
Good, but just say 7.7 N. (Block C exerts a force of 7.7 N on Block B--and vice versa.)
Just give the magnitude of the force.aruji73 said:
Yes, that's the net horizontal force on B.
OK. So apparently they want you to include the direction (via the sign), and they are taking positive to mean 'to the right'.aruji73 said:
I assume you are talking about "What is the horizontal force on block B due to block C?". Using the same convention as above, that force would have to be negative as well.
Newton's three laws of motion are:
1. An object at rest will stay at rest, and an object in motion will stay in motion with a constant velocity, unless acted upon by an external force.
2. Force is equal to mass times acceleration.
3. For every action, there is an equal and opposite reaction.
In this scenario, the first block at the bottom will exert a force on the second block, causing it to accelerate. The second block will then exert a force on the third block, causing it to accelerate as well. This follows Newton's second law, stating that force is equal to mass times acceleration.
To check if your answers and signs are correct, you can use the equations for each law to calculate the forces and accelerations in your scenario. Make sure to take into account the correct direction of the forces and accelerations, as indicated by the signs.
An example of Newton's third law is a person standing on a skateboard. As the person pushes their foot against the ground, the ground exerts an equal and opposite force on the skateboard, causing it to accelerate forward.
Newton's laws of motion are applicable to all objects and their motions in the universe. They are used in a variety of real-world situations, such as understanding the movement of cars and airplanes, predicting the behavior of sports equipment, and even explaining the orbits of planets around the sun.
