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# 7Sci CH1

### 7th Science CH1 Forces and Pressure

TermDefinition
Action force The force you exert when you push on something every action force as an equal and opposite reaction force that occurs at exactly the same time.
Balanced force Forces whose actions cancel each other out
Buoyant force Upward force exerted by water equal to the weight of water the object is displacing;
Force A push or pull,more force is needed to move a large object than a small object, force equals mass times acceleration
Inertia Tendency of an object to resist changes in motion; objects with large mass have greater inertia and resist acceleration; as the object’s inertia increases, the force needed to accelerate that object also increases
Newton Standard unit of force, abbreviated N; 1 newton of force equals the amount of force needed to accelerate a 1-kg mass at 1 m/s2
Pressure The force or weight acting on each unit of area; calculated by dividing the weight of an object by the surface area the object occupies
Reaction force The force that pushes back on you when you push on something, action-reaction forces occur in pairs, exert equal and opposite forces and happen at exactly the same moment
Weight The force by which an object is pulled by Earth’s gravitational force, calculated by multiplying acceleration due to gravity times the object’s mass