Chapter 10 Forces Flashcards

Terms Definitions
centripetal force
centripetal forceany force that causes an object to move in a circle(first word means "center-seeking"
What unbalanced force causes objects to accelerate towards the Earth's surface at a rate of 9.8 m/s2?
... gravity.
air resistance
opposes the motion of objects that move through the air
What is regular friction?
When two objects rub together.
weight
the amount or quantity of heaviness or mass; amount a thing weighs.
velocity
the time rate of change of position of a body in a specified direction.
What is the net force of forces that are equal in magnitude (size) but opposite in direction acting on an object?
... zero.
What are BALANCED FORCES?
... forces that are EQUAL in magnitude (size) but OPPOSITE in direction.
newton ( N )
newton ( N )a unit of measure that equals the force required to accelerate one kilogram of mass at a rate of one meter per second per second.
What law of motion best explains why you should wear a seatbelt when driving to ensure your safety?
Newton's first law of motion.
Do you still have weight when you float in water?
Yes, but you do not feel it.
What is Newton's second law of motion?
The net force on an object is the product of its mass and acceleration.
projectile
projectilean object that is thrown
momentum
the product of its mass and velocity
In which unit is force measured?
Newtons (N)
acceleration
the act of accelerating; increase of speed or velocity.
The amount of force required to accelerate a 1 kg mass at a rate of 1 m/s2 (meter per second squared)is a _________.
... Newton
What is INERTIA?
... the tendency of an object to resist a change in its motion.
Newtons second law of motion
states that the acceleration of an object is in the same direction as the net force on the object, and that the acceleration can be calculated
As the distance between two objects increases, what happens to the size of the universal force of attraction due to gravity between them?
The force of gravity decreases.
The net force on an object is equal to the product of its acceleration and its mass. How can the equation be written to show the relationship among the quantities force, mass and acceleration? (2 ways)
Force = Mass x AccelerationAcceleration = Force divided by mass
What is Newton's third law of motion?
It states that if one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object.
force
a push or pull
newton is the unit for
force
amount of matter in a body
mass
_______ is constant; _______ can change
mass, weight
unit for acceleration
m/s^2 (meters per second squared)
terminal
The greatest velocity a falling object reaches
satellites
in an orbit around the Earth continuolsy fall toward Earth, but because Earth is curved they travel around it
the greater the mass of two object, the ______ the attractive force between them
greater
the property of matter that resists a change in motion is
inertia
increasing the mass of a body causes the weight to ______
increase
when a falling body no longer accelerates, it has reached its
terminal velocity
anything that can change the motion of a body
force
if a body changes direction
a force has acted
the tendency of objects to remain in motion or stay at rest
inertia
can change the motion of a body
unbalanced forces
freefall
When the force on an object is gravity
Gravity
A force that pulls objects toward each other
friction
The force that two surfaces exert on each other when they rub against each other
a measure of the force of gravity on an object
weight
according to newton's second law of motion, force equals
mass X acceleration
balanced forces
Equal forces acting on one object in oppisite directions.
centripetal force
Any force that causes on object to move in a circular path
Unbalanced Forces
Whenever there is a net force acting on an object the forces are unbalnced. Motion occurs.
to find the total force when two forces are acting in the same direction
add the forces
weight of body on a surface
one factor determing amount of friction
for every action, there is an equal and opposite reaction
newton's third law of motion
law of conservation of momentum
in the absence of outside forces the total momentum of objects that interact does not change.
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