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# Forces

What is a force? A push or a pull
Forces are measure in what unit? newtons (N)
What are balanced forces? Forces that are equal in size and opposite in direction
Do balanced forces produce motion? NO!!!!
What type of forces produce motion? UNBALANCED
How do we calculate the net force if two forces are acting in the same direction? We add them
How do we calculate the net force if two forces are acting in opposite directions? We subtract them. The resultant force will be in the direction of the stronger force!
What is the net force if forces are balanced? ZERO
What is the force opposing motion between 2 surfaces that are touching? Friction
Friction always produces ___________. Heat
Friction depends on what 2 things? 1. Kind of surfaces 2. Amount of force pressing them together
Define gravity. (DO NOT SAY THE FORCE PULLING YOU DOWN!) Gravity is the force that all objects in the universe exert on all other objects.
Gravity depends on what 2 things? Mass and distance
What type of objects would exert the most gravitational pull? The ones with the MOST MASS!
How does distance affect gravity? There is more gravitational pull between objects when they are CLOSER TOGETHER
What is the difference between weight and mass? Mass is the total amount of matter in an object. Weight is the pull of gravity on your mass. If gravity changes........weight changes. Not mass
Mass is measured in grams or kilograms
Weight is measured in Newtons because forces are measured in newtons and gravity is a measure of the FORCE of gravity
What is Newton's First Law of Motion? Objects in motion will stay in motion and objects at rest will stay at rest unless acted on by an outside force. In other words......INERTIA
What is Newton's Second Law of Motion? Force = mass x acceleration
What are the units of acceleration? meters per second squared or m/s/s
What is Newton's Third law of Motion? For every action there is an equal and opposite reaction.
If you wanted to lose weight why would it be smarter to go to the moon than to go to Jupiter? Since the moon has less mass then the Earth you would weight less on the moon. On Jupiter you would weight more. Neither trip would change your mass because mass is not dependent on gravity.
Created by: cwalczak