Science Ch 10 - Vocab
Terms in this set (37)
a push or a pull
What is force described by?
its magnitude and the direction in which it acts
the SI unit of the magnitude, or strength, of a force
the combination of all forces acting on an object
the net force acting on an object is unbalanced
What is the result of unbalanced forces?
it results in a net force and causes a change in the objects velocity
equal forces acting on one object in opposite directions
What is the result of balanced forces?
it results in no change of the objects velocity
the force that two surfaces exert on each other when they rub against each other
What does the strength of the force of friction depend on?
the types of surfaces involved and on how hard the surfaces push together
the type of friction that acts on objects that aren't moving
the type of friction when two solid surfaces slide over each other
the type of friction when an object rolls across a surface
the type of friction when a solid object moves through a fluid/liquid
a force that pulls objects toward the Earth's center
How does the force of gravity differ when there is greater mass and greater distance?
the force of gravity increases with greater mass and decreases with greater distance
the measure of the amount of matter in an object
the gravitational force exerted on a person or object at the surface of a planet
What is the formula for weight?
weight equals mass times acceleration due to gravity
when the only force acting on an object is gravity
a type of fluid resistance that acts on objects falling through the air
an object being thrown
Why is matter considered elastic?
it is elastic if the matter returns to its original shape after it is squeezed or stretched
an elastic force that squeezes or pushes matter together
an elastic force that stretches or pulls matter
What does Newtons first law state?
an object at rest will remain at rest until acted upon by an unbalanced force
this is the tendency of an object to resist a change in motion
What does Newtons second law state?
acceleration depends on the net force acting on the object and on the objects mass
What is the formula for acceleration?
acceleration equals net force divided by mass
What dos Newtons third law state?
if one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction of the first object
a characteristic of a moving object that depends on both the mass and velocity
What is the formula for momentum?
momentum equals mass times velocity
law of conservation of momentum
in the absence of outside forces, the total momentum of objects that interact does not change
How can a rocket rise into the air?
the gases the rocket expels with a downward action force exert an equal but opposite reaction force on the rocket
any object that orbits another object in space
any force that causes an object to move in a circular path
How do satellites orbit the Earth?
satellites in orbit around Earth continuously fall toward Earth, but because Earth is curved they travel around it