Forces and Newton’s Laws of Motion
Forces are all around us, and there are a few things which need to be understood in order to analyse them in a proper manner.
It would be quite a long post if I just wrote the ideas here, so instead I made a couple of videos for you to watch. The first video is for learning how to add up forces in general, while the second is for going through the basics of Newton’s laws of motion. Questions about forces and Newton’s laws of motion will be posted here right after the videos.
Newton’s Laws of Motion
Here is the link to the slide show about Newton’s laws of motion, and here’s one for the video.
Check Your Understanding
So, here are a few questions which are actually for my students, who need to do this as homework. If you’re reading this post about forces and Newton’s laws, you may answer the questions to check your own understanding.
A box is on a table. It is stationary.
Use Newton’s first law to explain why it is not moving.
A boy pushes the box on the table from one side with a force of 1.0 N, and his friend pulls it from another side with a force of 1.5 N. The mass of the box is 2.0 kg. Assume that friction is negligible (very small).
Find the resultant force on the box and the magnitude of the acceleration when:
- the boy pushes from behind, and his friend pulls the front of the box.
- the boy pushes from behind, and his friend pulls the right side of the box.
Identify all the action-reaction force pairs in question 2.
When the box reaches a rough section on the table, the boy keeps pushing the box, while his friend stops pulling. Use the second law to describe what would happen if friction is not negligible, and has a value of 1.0 N.
Just a reminder to all, always keep the basic ideas in mind when solving any force-related problems, or any science and mathematics questions on general. Everything else will come from those basics.
See you next post!