# Unit 2 study words 33

Term Definition
Force a push or pull
Agent object that produces/has the force
Receiver object that gets the force
Effect what happens
Contact Force force has to touch the object
Non Contact Force force doesn't touch the object
Motion an object changes position over time
Opposing Forces forces that work against each other
Balanced Forces forces that work against each other but are equal in size and have no motion
Unbalanced Forces forces that work against each other and are unequal in size and create motion
Spring Scale measuring force in Newtons
Newton measuring unit for force
Magnitude size of something
Vectors a simple diagram showing force with arrows
Net Force force result after two forces work on an object (total) (- from opposing) (+ for same)
Gravity a force of attraction between objects hat is due to their masses
Isaac Newton discovered gravity in the summer due to an apple falling on his head
Attractive Force forces that pull objects to themselves
Weight a measure of the gravitational for exerted on an object
Mass the amount of matter something is made of
Friction two forces make contact,
Tool: spring scale Unit: Newtons
Rolling Friction one round surface makes contact
Sliding Friction two surfaces rub/slide across
Static Friction STAY STILL : stops movement
Fluid Friction one surface must be either liquid or air
Speed how fast an object is moving,
S= D divided by T
Velocity speed plus direction,
V= S plus Direction
Acceleration a change in Velocity
final V – staring V divided by time it took to change
Momentum power an object has
M= M * V
Newtons First Law Of Motion an object at rest will stay at rest, an object in motion will stay in motion, until acted upon by a force
Newtons Second Law Of Motion acceleration of an object depends on mass and force
Newtons Third Law Of Motion one object exerts a force on another object, exerts a force right back

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