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09 Chat 9 motion
motion
Question | Answer |
---|---|
Force | a push or pull |
Newton | the SI unit for force |
Unbalanced force | causes an object's motion to change |
Balanced forces | never change the object's motion |
Friction | the force that one surface exerts on another when the two rub against each other |
Gravity | the force that pulls falling objects toward Earth |
Mass | the amount of matter in an object |
Weight | the force of gravity on a person or object on the surface of a planet |
unit of force, a newton, is equal to | kilogram times meter per second squared |
An object in free fall | accelerates until it reaches terminal velocity |
Objects falling through air experience | a type of friction called air resistance |
Inertia | the tendency of an object to resist change in its motion |
Momentum | the product of an object's mass and velocity |
Law of Conservation of Momentum | when two objects collide in the absence of friction, momentum is not lost |
Friction acts in a direction | opposite to the direction of an object's motion |
Centripetal Force | any force that causes an object to move in a circle |
Velocity | the momentum of an object in the same direction |
Forces can be added together only if they are | acting on the same object |
A rocket can lift off into space if | the thrust is greater than Earth's gravity |
The greater the mass of an object | the greater its inertia |
When two forces act in the same direction | the forces are added together |
Law of Universal Gravitation | any two objects in the universe attract each other |
Satellite | an object that travels around another object in space |