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Your weight is how much gravity is pulling down on you. This can change with different locations in the universe. Your mass is how much matter you have in you. This number doesn't change with your location in the universe.

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Gravitational Force Decreases as Distance Increases 

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Gravitational Force Decreases as Distance Increases 

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Gravitational force decreases as mass decreases and/or the distance between the two objects increases. Gravitational force is weak when one or both of the objects are small.

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Gravitational force increases as mass increases and/or as the distance between two objects becomes less. Gravitational force is large when one or both of the objects are large.

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All matter has mass and gravity is a result of mass.

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A measure of the amount of matter in an object.

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A measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe.

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A force of attraction between objects that is due to their masses.

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Average Acceleration= Final Velocity- Starting Velocity/Time it Takes to Change Velocity

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When you combine velocities, you end up with a resultant velocity which is the combination of the velocities that were given. For example, if you are walking forward on a moving bus at 3 mph, and the bus is moving forward at 25 mph, the resultant velocity is 28 mph.

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In velocity, you must have a reference direction and your speed. The only difference between speed and velocity is that velocity has a reference direction and speed does not.

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On a graph, increasing speed is represented by an increasing line. When speed is decreasing, the line will decrease as well.

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SI unit for speed- Meters per second

Average Speed= Total Distance/Total Time

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Reference Point Definition and Examples-

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Reference Point Definition and Examples-

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A reference point is the object that stays in place when you are moving. For example, when you are in a car, mail boxes don't move backwards.

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The rate at which velocity changes over time; an object accelerates if speed, direction or both changes.

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The speed of an object in a particular direction.

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The distance traveled divided by the time interval during which the motion occured.

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An object's change in direction in position relative to a reference point.

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When forces are balanced, there is no motion that will occur. When forces are unbalanced, motion will occur.

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Forces in the Same and Different Directions

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Forces in the Same and Different Directions

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When determining the net force, some vectors may run in the same or different directions. When they go in the same direction, you combine the forces together. If they happen to run in different directions, you also combine them and whichever side has more force, is the direction that the force will run in.

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You determine net force by adding up the forces and then figuring out which direction of force has more force being applied.

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Forces that you can't see-Magnetic force, friction, gravity etc.

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Force is expressed in newtons.

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The SI unit for force (represented by an N

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The combination of all of the forces acting on an object.

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A push or pull exerted on an object in order to change the motion of the object; force has size and direction.

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When you apply force to an object, static friction takes effect either preventing you from pushing/pulling it or making harder to move (unless it is a surface with not much friction). When the object starts to move, static friction turns to kinetic friction.

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Section 1- Measuring Motion
Section 2- What is a Force?
Section 3- Friction: A Force that Opposes Motion
Section 4- Gravity: A Force of Attraction

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Substances that are applied to surfaces to reduce friction.

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By making the surfaces smoother or by using a lubricant such as wax, grease, or motor oil in cars.

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By making the surface that is being rubbed on rougher or by increasing the force being exerted. For example, salt/sand scattered on roads to increase friction between car tires and the road.

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Allows pencils and other writing utensils to be used (sliding). Prevents you from falling flat on your face when walking. Allows brakes on bikes, cars, buses etc. to be used.

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Causes holes in jeans and socks. Erosion of top soil that plants need to survive is another negative.

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Every surface has microscopic hills and valleys. Rougher surfaces have more microscopic hills and valleys than smooth surfaces.

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Static friction- Not moving friction. When an object doesn't move because the friction is greater than the force applied. As soon as the object starts moving, the static friction turns into kinetic friction.

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Kinetic friction- Moving friction. The friction that takes effect on moving objects.

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Velocity has direction, speed does not.

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A force that opposes motion between two surfaces that are in contact.