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Science Chapter 2 flashcards
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Gravity
Terms in this set (64)
Force
A push or a pull
Newton
SI unit used to measure force
Net force
The combination of all forces acting on an object
Unbalanced forces
Causes an object to start moving, stop moving, or change direction
Balanced forces
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
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 measure of the 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
Air resistance
Objects falling through the air experience this type of fluid friction
Terminal velocity
The greatest velocity a falling object reaches
Projectile
An object that is thrown
Inertia
The tendency of an object to resist a change in motion
Momentum
A characteristic of a moving object that is related to the mass and the velocity of the object
Law of conservation of momentum
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
A _____ is described by its strength and by the direction in which it acts
force
A force is described by its ______ and by the direction in which it acts
strength
A force is described by its strength and by the direction in which it _____
acts
____ forces acting on an object result in a net force and a change in the object's motion
Unbalanced
Unbalanced ____ acting on an object result in a net force and a change in the object's motion
forces
Unbalanced forces acting on an object result in a net force and a change in the object's ____
motion
Balanced forces acting on an object do not change the objects ____
motion
______ forces acting on an object do not change the objects motion
balanced
Balanced forces acting on an object do not _____ the objects motion
Change
The _____ of the force of friction depends on two factors: how hard the surfaces push together and the types of surfaces involved
Strength
The strength of the force of friction depends on two factors: how hard the surfaces push together and the types of ____ involved
Surfaces
The strength of the force of friction depends on two factors: how ____ the surfaces push together and the types of surfaces involved
Hard
Two factors affect the ______ attraction between objects: mass and distance
Gravitational
Two factors affect the gravitational attraction between objects: _____ and distance
Mass
Two factors affect the gravitational attraction between objects: mass and ____
Distance
In free fall, the force of _____ is an unbalanced force, which causes an object to accelerate
Gravity
In free fall, the force of gravity is an unbalanced force, which causes an object to _____
Accelerate
In free fall, the force of gravity is an _____ force, which causes an object to accelerate
Unbalanced
An object at rest will remain at rest, and an object moving at a constant _____ will continue moving at a constant velocity, unless it is acted upon by an unbalanced force
Velocity
An object at rest will remain at rest, and an object moving at a constant velocity will continue moving at a constant velocity, unless it is acted upon by an _____ force
Unbalanced
An object at rest will remain at rest, and an object moving at a constant velocity will continue moving at a constant velocity, unless it is acted upon by an unbalanced ____
Force
_____ depends on the object's mass and on the net force acting on the object
Acceleration
Acceleration depends on the object's _____ and on the net force acting on the object
Mass
Acceleration depends on the object's mass and on the net ___ acting on the object
Force
______ = net force / mass
Acceleration
Acceleration = _ __ / mass
Net force
Acceleration = net force / ____
Mass
If one object exerts a ____ on another object, then the second object exerts a force of equal strength in the opposite direction on the first object
Force
If one object exerts a force on another object, then the second object exerts a force of equal ___ in the opposite direction on the first object
Strength
If one object exerts a force on another object, then the second object exerts a force of equal strength in the _____ direction on the first object
Opposite
the momentum of a moving object is equal to its mass times its ____; Momentum = mass x velocity
Velocity
the momentum of a moving object is equal to its ___ times its velocity; Momentum = mass x velocity
Mass
The ____ of a moving object is equal to its mass times its velocity; Momentum = mass x velocity
Momentum
The total ____ of any group of objects remains the same, or is conserved, unless outside forces act on the objects
Momentum
The total momentum of any group of objects remains the same, or is ____, unless outside forces act on the objects
Conserved
The total momentum of any group of objects remains the same, or is conserved, unless outside ___ act on the objects
Forces
A rocket can rise into the air because the ____ it expels with a downward action force exert an equal but opposite reaction force on the rocket
gases
A rocket can rise into the air because the gases it expels with a downward action force exert an ___ but opposite reaction force on the rocket
Equal
A rocket can rise into the air because the gases it expels with a downward action force exert an equal but opposite reaction ___ on the rocket
Force
Satellites in orbit around Earth continuously fall toward Earth, but because Earth is ____ they travel around it
Curved
Satellites in orbit around ____ continuously fall toward Earth, but because Earth is curved they travel around it
Earth
_____ in orbit around Earth continuously fall toward Earth, but because Earth is curved they travel around it
Satellites
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