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# Physical Science U1

### newtons first law, inertia, and motion

TermDefinition
distance how far you have traveled between two positions. It's always positive. It's a scalar quantity
Displacement change in position. It's the straight line distance between your starting position and ending position. It's equal to final position minus initial position. It can be positive or negative. It's a vector quantity
Scalar quantity that requires magnitude (how big)
Vector quantity that requires both magnitude (how big) and directions
Speed how fast something is moving. It's equal to distance divided by time. It's a scalar quantity
Velocity rate at which position changes. It's equal to displacement divided by time. It's a vector quantity.
Newtons First Law AKA the law of inertia. An object at rest will stay at rest and an object in motion will stay in motion with the same speed and same direction unless acted upon by an unbalanced force
Inertia the resistance an object has to change in its motion
mass a measure of the amount of matter an object contains.Also, a measure of the amount of inertia an object has.
force any push or pull(interaction) that can cause a change in motion
net force the combination of all the forces of an object
balanced force when the net force in both the horizontal and vertical is 0N
unbalanced force when the net force in both the horizontal and vertical is not 0N
Gravitational force a non-contact force between two objects that's most apparent close to a large object, such as a planet, The direction of the force is generally towards the center of the other object
Applied force the support force exerted upon an object that is in contact with another stable object. It's in the direction of the push or pull
Normal force a contact force that's exerted by a surface against an object that is pressing against the surface. It's perpendicular to the surface and present when atoms are being crunched.
Tension force contact force exerted by a taut string, rope, or wire on an object. It's along the rope and present whenever a rope is taught
Friction force force exerted by a surface as an object moves across it or makes an effort moves across it. It's parallel the the surface in the direction opposite of the motion or attempted motion
Air Resistant a special type of frictional force that acts upon objects as they travel through the air/fluid. It is in the opposite direction of the motion of the object.
Spring a special type of frictional force that acts upon objects as they travel through the air/fluid. It is in the opposite direction of the motion of the object.
Thrust A contact force that is exerted in the opposite direction of an exhaust gas being expelled.
Created by: tavarre13