Physical Science - Chapter 3: Forces
force
...
friction between two surfaces that are not moving past each other is called _____ friction
static
forces on a falling object are balanced and the object falls with constant speed
terminal velocity
projectile motion
the curved path that an object follows when thrown, launched, or otherwise projected near the surface of Earth
Name two factors of friction
the kind of surface and the force pressing surfaces together
horizontal motion
the motion that is inertia to earth's surface and is due to inertia
vertical motion
the motion that is perpendicular to earth's surface is from gravitational pull
How you move is based on Newton's _____ law of motion
third
_____ and _____ have horizontal and vertical velocities due to gravity, and follow a curved path.
weight and mass
momentum can be changed between objects; momentum is not lost or gained in the transfer; is the _________
Law of conservation of momentum.
the _____ of an object and the force applied to it affect acceleration
Mass
weight results from a force; _____ is a measure of how much matter an object contains
Mass
_____ is related to how much force is needed to change an object's motion
Momentum
before it was discovered, the existence of the planet _____ was predicted based on gravitational forces and Newton's laws
Neptune
Force and Motion are _____
connected
Newton's third law of motion
describes action-reaction pairs - to every action force there is an equal and opposite reaction force.
acceleration equals net force _____ by mass
divided (Newton's second law of motion)
due to _____, all objects fall with the same acceleration regardless of mass
electromagnetic forces
weight ____ ____ as an object moves away from Earth.
exerts force
friction
force that opposes motion between two touching surfaces.
force that opposes motion between two surfaces that are touching each other
friction
weight
gravitational force exerted on an object by Earth.
_____ is a basic force that gives the universe its structure
gravity
_____ is one of the four basic forces that also include the electromagnetic force, the strong nuclear force, and the weak nuclear force
gravity
any two masses exert an attractive force on each other
law of gravitation
Objects in the space shuttle _____ _____ because they have no force supporting them.
lose weight
areas where surface bumpers stick together, are the source of friction.
microwelds
mass times velocity equal
momentum
to every action force there is an equal and _____ reaction force
opposite (Newton's third law of motion)
momentum equation
p=mv
momentum
property that a moving object has because of its mass and velocity.
the gravitational force exerted on an object is called
range of gravity
friction between a rolling object and the surface it rolls on is called
rolling friction
the amount of air resistance depends on an object's _____, _____ and _____
shape, size and speed
force that opposes the motion of two surfaces sliding past each other
sliding friction
Newton's second law of motion
states that a net force acting on an object causes the object to accelerate in the direction of the net force.
law of gravitation
states that any two masses exert an attractive force on each other, the amount of which depends on the mass of the two objects and the distance between them.
formula Newton's second law
Acceleration = Force/Mass or Mass * Acceleration = Force
centripetal force
a force directed toward the center of the circle for an object moving in circular motion.
centripetal acceleration
acceleeration of an object toward the center of a curved or circular path.
an object will have greater _____ if a greater force is applied to it.
acceleration
____ - _____ forces act on two object and differ from balanced forces
action - reaction
It opposes the force of gravity
air resistance
acceleration toward the center of a curved path is call _____ _____; it is caused by _______ ______, an unbalanced force
centripetal acceleration and centripetal force