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jeerapat lommahadthai

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
Reference point   is the starting point you choose to describe the location, or position of an object.  
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Position   is an object distance and direction from the reference point  
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Motion   is a process of changing position  
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Displacement   is a different between the initial and the final position of an object  
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Speed   A measure of distance an object travel per unit of time  
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Constance speed   is a rate of change of position in which the same distance is travel each second  
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Instantaneous speed   is speed at a specific instant in time  
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Average speed   is the total distance traveled divided by a total time taken to travel that distance.  
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Velocity   is the speed and direction of a moving object  
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Acceleration   is a measure of change in velocity during a period of time  
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Force   a push or pull on an object  
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Contract force   a push or a pull on one object by another object that is touching it  
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Non contract force   a force that one object applies to another object without touching it  
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Gravity   an attractive force that exists between all objects that have mass  
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Mass   the amount of matter in an object  
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Weight   the gravitational force exerted on an object.  
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Friction   the gravitational force exerted on an object.  
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Net force   the combination of all the forces acting on an object  
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Balanced forces   Balanced forces  
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Unbalanced forces   forces acting on an object that combine and form a net force that is not zero  
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Newton’s first law   law that states that if the net force acting on an object is zero, the motion of the object does not change  
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Inertia   the tendency of an object to resist a change in motion  
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Newton’s Second law   law that states that the acceleration of an object is equal to the net force exerted on the object divided by the object's mass  
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Circular motion   law that states that the acceleration of an object is equal to the net force exerted on the object divided by the object's mass  
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Centripetal   in circular motion, a force that acts perpendicular to the direction of motion, toward the center of the curve.  
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Newton’s third law   law that states that for every action there is an equal and opposite reaction  
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Force pair   the forces two objects apply to each other  
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Momentum   a measure of how hard it is to stop a moving object.  
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Law of conservation of momentum   a principle stating that the total momentum of a group of objects stays the same unless outside forces act on the objects.  
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Sound wave   a longitudinal wave that can travel only through matter  
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Pitch   the perception of how high or low a sound is; related to the frequency of a sound wave  
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Echo   a reflected sound wave  
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Energy   the ability to cause change.  
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Kinetic energy   energy due to motion  
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Electric energy   energy carried by an electric current.  
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Potential energy   stored energy due to the interactions between objects or particles.  
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Chemical energy   energy that is stored in and released from the bonds between atoms.  
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Nuclear energy   energy stored in and released from the nucleus of an atom.  
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Mechanical energy   energy stored in and released from the nucleus of an atom.  
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Thermal energy   the sum of the kinetic energy and the potential energy of the particles that make up an object.  
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Sound energy   energy carried by sound waves.  
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Seismic energy   the energy transferred by waves moving through the ground.  
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Radiant energy   energy carried by an electromagnetic wave.  
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Energy transformation   - the conversion of one form of energy to another.  
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Law of conservation of energy -   law that states that energy can be transformed from one form to another, but it cannot be created or destroyed  
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Work   the amount of energy used as a force moves an object over a distance.  
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Simple machines   a machine that does work using one movement.  
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Inclined plane   a simple machine that consists of a ramp, or a flat, sloped surface.  
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Screw   a simple machine that consists of an inclined plane wrapped around a cylinder.  
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Wedge   a simple machine that consists of an inclined plane with one or two sloping sides; it is used to split or separate an object.  
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Lever   a simple machine that consists of a bar that pivots, or rotates, around a fixed point.  
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Wheel and axle   a simple machine that consists of an axle attached to the center of a larger wheel, so that the shaft and wheel rotate together.  
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Pulley   a simple machine that consists of a grooved wheel with a rope or cable wrapped around it.  
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Complex machines   two or more simple machines working together.  
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