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Forces
Chapter 2 test
Question | Answer |
---|---|
Force | a push or pull |
newton | The strength of a force |
Net Force | The combination of all forces acting on an object |
Unbalanced force | Whenever there is net force acting on an object the object is unbalanced |
Balanced force | Equal forces acting on one object in opposite directions |
Friction | The force that two surfaces exert on each other when they rub against each other |
Static friction | The friction that acts on objects that are not moving |
Sliding friction | occurs when two solid surfaces slide over each other |
Rolling friction | occurs when an object rolls across a surface |
Fluid Friction | occurs when a solid object moves through a fluid |
Gravity | a force that pulls objects toward each other |
Mass | a measured amount of matter in an object |
Weight | The force of gravity on a person or object at the surface of a planet |
Free Fall | When the only force acting on an object is gravity the object is said to be in ____ ____ |
Air resistance | Objects falling through air experience a type of fluid friction called ___ __________ |
Terminal velocity | the greatest velocity a falling object reaches |
Projectile | an object that is thrown |
Inertia | Galileo's concept of air resistance to a change in motion |
Momentum | A characteristic of a moving object that is related to the mass and the velocity of an object |
law of conservation of energy | States that, in the absence of outside forces the total momentum of objects that interact does not change |
Satellite | any object that orbits another object in space |
Centripetal force | Any force that causes an object to move in a circular path |
Linear | motion in a straight line |
Projectile | Motion along a curved path |
Rotational | Spinning motion around a fixed/stationary point |
Vibrational | Series of small but fast back and forth movements or side to side |