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Physical Science
Forces Test
Term | Definition |
---|---|
Force | a push or a pull that acts on an object |
Newton | force that causes a 1-kilogram mass to accelerate at a rate of 1 meter per second each second |
Net Force | is the overall force acting on an object after all the forces are combined |
Friction | a force that opposes the motion of objects that touch as the move past each other |
Static Friction | the friction force that acts on objects that are not moving |
Sliding Friction | a force that opposes the direction of motion of an object as it slides over a surface |
Rolling Friction | the frictional force that acts on rolling objects |
Fluid Friction | opposes the motion of an object through a fluid |
Air Resistance | fluid friction acting on an object moving through the air |
Gravity | a force that acts between any two masses. Gravity is an attractive force, that is , it pulls objects together. |
Terminal Velocity | the constant velocity of a falling object when the force of air resistance equals the force of gravity |
Projectile Motion | the motion of a falling object after it is given an initial forward velocity |
Inertia | |
Mass | the measure of the inertia of an object and depends on the amount of matter the object contains |
Weight | the force of gravity acting on an object |
First Law of Motion | according to this law of motion, the state of motion of an object does not change as long as the net force acting on the object is zero. |
Second Law of Motion | according to this law of motion, the acceleration of an object is equal to the net force acting on it divided by the object’s mass |
Third Law of Motion | according to this law of motion, whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object |
momentum | the product of an object’s mass and its velocity |
conservation of momentum | if no net force acts on a system , then the total momentum of the system does not change |