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# Science 2985

### Test

Motion This is if it's distance from another object is changing.
Reference Point Is a place or object used for comparison to determine if something is in motion. A change in an object. Examples: A tree, sign, or a building.
Speed Is the distance the object travels per unit of time. Formula: Speed= Distance/Time
Velocity The speed of an object and the direction it is moving. Example: Is meter/second.
Constant Speed The speed that stays the time all through a long period of time.
Average Speed The normal speed a person goes at on a road. Formula: Speed= Divide the total distance divided by total timed. Last speed of the graph.
Acceleration Is the rate of change of direction. = Final V- Initial V/ Time Velocity/Time meter/min/sec speeding up, slowing down, and change in direction.
Triangle D S T
Force Is a push or a pull on an object that can affect its motion. Which may give energy to an object and cause it to start moving, stop moving or change direction.
Balanced Force Equal forces acting on one object in opposite direction. They do not change the object's direction. Example- When two people put their back together.
Unbalanced Force Can cause an object to start moving, stop moving, or change direction. Example- When two different weights of people put their back together.
Newtons (SI) The standard unit for measuring a force.
Net Force Combination of all forces acting on an object.
Buoyancy Force The force of water pushing up on an object. Over 1.0 you sink and under 1.0 you float.
Friction Is a force that opposes (slows) motion. It occurs whenever two objects are in contact with each other. Can be reduced by oil/ lubricants.
Gravity Every object has a gravitational force. The strength of the gravity depends on how much mass the objects have and how far apart they are from each other. The moon's gravity pulls earthâ€™s oceans and creates tides.
Weight Amount of gravitational force acting on an object. After 1 second velocity 9.8 m/s 2 down After 2 seconds, velocity is 19.6 m/s 2 down. (9.8 x 2)
Drag Force When an object moves through air or liquid, it will slow down. In a vacuum (no air), all objects would hit the ground at the same time. Examples: A parachute A penny tossed into water A bowling ball lands lands faster than a feather
Magnetism Is the force exerted when they attract or repel each other. Is caused by the motion of electric charges.
Newton's 1st Law Of Motion An object at rest (velocity 0) tends to stay at rest until some force acts on it. Also, known as inertia.
Lubricant Is a substance helps reduce friction between surfaces in mutual contact which ultimately reduces heat generated when surfaces move. It may also have the function of transmitting forces, transporting foreign particles, or heating or cooling the surfaces.
Inertia Is the tendency of an object to oppose any change in motion. Examples: Bus, airbag
Newton's 2nd Law Of Motion A greater the force of the object the greater it will accelerate. Force= Mass X Acceleration F M A
Newton's 3rd Law Of Motion States that for every action (force) in nature there is an equal and opposite reaction. Examples: Stomping, Jumping off a float
Spring Scale Measures force.
Mass Kg.
Created by: jschwartzman
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