Transcript of Matter in Motion
Matter In Motion How do you tell if something is moving? A reference point is used since it appears to stay in place. The background and foreground or other moving object are used to tell if an object is moving. MOTION occurs when it changes position over time relative to a referance point. speed, velocity, accleration, circular motion are types motion SPEED A distance traveled in a certain amount of time. How do you represent speed types when working with a graph? Shows where object is and how long it takes to get to that spot. ACTUAL SPEED is a Zig zag line on a graph. TOTAL TIME & TOTAL DISTANCE TRAVELED AVERAGE SPEED is a straight line on a graph. Velocity velocity is speed in a specific direction. EXAMPLE: meters / second east Velocity can be constant(speed stays the same) if motion is moving in a straight direction If speed, direction, or both change so does the velocity Resultant Velocity This is when velocities are combined Same direction velocities are added Opposite direction velocities are subtracted. Acceleration Rate at which velocity changes over time. So...its how fast something speeds up or how fast something slows down? On a graph ACCELERATION is represented with a straight line going upward. On a graph DECELERATION is reprsented with a straight lin going downward. Acceleration is expressed as a distance/time/time with a direction. If an object speeds up/slows down, changes direction or both happen at the same time the object's acceleration will change. Circular Motion This is any object that goes in a circle. So...that means that an object is going to continuously accelerate. What is a force? Force is a push or a pull in any direciton. A force has a size and direction. Force is measured in newtons (N). What if I can't see the force? This is known as an unseen force. They are hard to see since you don't know what is exerting the force and what is receiving the force. Examples: magnets, static electricity, gravity Net Force Combination of all forces acting on an object. Forces are added or subtracted depending on which direction the forces are going. (tug of war, moving furnature) Types of Forces Balanced Vs. Unbalanced An object will not move. An object will move. An object has a net force of 0 N An object has a net force greater than 0 N An object will remain at rest unless an unbalanced force acts on it. Causes an object to move or change its direction. An object will continue to move without any contact with object. Friction:Full transcript
Force That Opposes Motion Where does friction come from? Force that opposes motion between two surfaces that touch. Factors that affect the amount of friction? Types of friction Kinetic - applying force to an object and it overcomes friction to create movement without wheels.
EX: Sliding or Rolling an object. Static - applying a force to an object but it does not overcome friction.
EX: Such as pushing on a parked car. BUT as soon as car moves kinetic friction occurs. Matter In Motion Matter In Motion Matter In Motion * amount of down force
* roughness of surfaces (hills and valleys) Which graph represents
actual speed and average speed? ACTUAL SPEED AVEREAGE SPEED SO... SPEED = Distance / Time Not worried about stopping, slowing down, speeding up. Need to pay attention to stopping, slowing down, speeding up. static electricity magnets gravity