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Force and Motion

G5 CH 8 Force and Motion

TermDefinitionNotes:
force a push or pull that can act on or change an object Familiar Forces: push, pull, friction, gravity, magnetic
friction an opposing force caused by two objects touching each other Applied Force vs. Friction Usually, when you apply a force to move something, friction acts in the opposite direction. If your applied force is greater than the friction, the object will move (this is an unbalanced force). If you push a heavy box but it doesn't budge, your applied force is being balanced out by friction.
balanced when two equal forces acting on an object cancel out each other’s effect on the object
unbalanced a force that is unequal in size and may or may not be opposite in direction that causes a change in an object's motion, resulting in: acceleration, deceleration, or a change in direction.
speed a measure of how fast an object is moving. It tells you how much distance an object covers in a specific amount of time. S=D/T, MPH
mass a measure of how much ______________ an object has.
contact force a push or pull that moves or changes an object when two objects touch tag (applied force)
non-contact force a force that does not need to touch an object to affect it, such as gravity red/green light
inertia an object’s ability to oppose a change in motion
acceleration Speeding up: Slowing down: (sometimes called "deceleration"). Changing direction...even if they stay at the same speed
resistance a force that acts against motion Parachutes
Texture A physical property of a solid used to describe its surface. grass: wood floor: Tile floor sandpaper: ice sand carpet
Observation Information about the natural world gathered through the senses and/or scientific instruments.
ramp a type of simple machine called an inclined plane. It is a flat surface set at an angle (tilted) that helps you move objects up or down.
assume to suppose something is true
direction is the path that an object travels or the way a force is pushing or pulling.
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