unit 2
Types of interactions
Forces with direct and without direct contact: Some forces don't even have to physically touch the object to exert force on it. This works since it has a field force and that is something that allows it to exert force on a object from a distance. While other things have to physically touch an object to exert a force on a object.
Newtons universal law of gravitation: This law states that an two objects with mass can exert a force of attraction on one another. Directly proportional and indirectly proportional: For directly proportional as one amount increases the other increases at the same rate, same for negatively an example is a girl sold a lemonade and made money off of that lemonade. For indirectly proportional as one amount increases the other decreases. So, for example as the news paperboy increases his speed of his delivery the time it takes him to complete his route will decrease. Distance/mass and force of gravity: Well first the more mass an object has the more gravity it has. And, the greater the distance between objects the less gravity there will be, but the less distance between two objects means there will be more gravity. And, the formula for distance is F=1 over d so that means force= 1 over distance. Also, when the formula is inversely proportional distance will be squared. Positive charges: Positive charges are unbalanced since they have more protons then electrons. Negative charges: Negative charges are unbalanced as well since they have more electrons than protons. Coulombs law: This is the forces exerted between charges, for examples ones that are alike repel each other and opposites attract. Electric fields and electric field lines: When the lines have arrows going outwards that means its positive, and opposite for negative. When the charge is equal there are no lines, and the closer the lines are to each other the stronger the force. And, lines will never cross. Magnetism: Is a field force exerted on other magnets that can either make them repel or attract each other. |