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32 Cards in this Set

  • Front
  • Back

what is a force, and what id the difference between a balanced and unbalanced force?

A force is a push or pull. An unbalanced force occurs when the forces acting on an object are not equal. A balanced force occurs when the forces acting on an object are equal.

how do we describe a force?

By how strong they are and the direction in which they act

when can forces be added together?

only when two object acting on the same object in the same direction can be added together.

what effect do balanced and unbalanced forces have upon an object?

unbalanced= cause object to stop moving, stop moving, or change direction



balanced force= will never change the motion of an object.

be able to draw a diagram of a balanced and unbalanced force?

what are all changes in motion caused by?

force

what is a newton (N) a unit of, and what is it equal to?

a newton is the unit for force. 1N is equal to 1kg

what is friction?

the force that one surface exerts on another when the surfaces rub together.

what are the 4 types of friction, and when do each occur?

- Static friction acts on objects that are not moving, because you must use extra force to start the motion.



Sliding friction is when 2 solid surfaces slide over each other.




Rolling friction when an object rolls over a surface




Fluid friction when an object moves through a fluid

what might be used to reduce sliding friction?

change sliding to fluid

what determines the strength of friction?

the types of surfaces involved and how hard the surfaces push together

If the friction on an object decreases, what happens to the force needed to move that object?

a rough surface is needed to produce greater friction

what does the law of universal gravitation state?

the force of gravity acts between all objects in the universe

what determines the strength of gravity?

the masses of distance between 2 objects

what is weight?

the force of gravity on a person or object at the surface of a planet

describe each of newton's 3 laws

-1st law: an object at rest will stay at rest, an object in motion will stay in motion unless acted upon by an unbalanced force



-2nd law: the net force of an object is equal to the product of its acceleration and mass




-3rd law: if one object exerts a force on another object, then the 2nd object exerts a force of equal strength in the opposite direction back on the 1st object

what is inertia?

the resist of any change in motion

define mass

the amount of matter in an object

how does mass effect inertia?

the amount of inertia an object has depends on its mass

what are action/reaction forces, and why don't they cancel each other out?

one object exerts a force on another object, then the 2nd object exerts a force of equal strength in the opposite direction back on the 1st object

how do you changed acceleration?

increasing the force, or decreasing the mass

why does an object bounce when you drop it?

action/reaction forces

what do momentum,acceleration, and velocity have in common?

they are described by their direction and magnitude

what do you mean when you say "momentum is conserved?"

the total momentum of the objects in an interaction is the same before and after the interaction. (this is considered when no outside forces are involved)

what is free fall?

when the only force acting on an object is gravity

what is the acceleration due to gravity?

9.8 m/s 2

what does an object, in free fall, do until it reaches terminal velocity?

it will experience fluid friction or air resistance

what is air resistance and how does surface area affect it?

a type of fluid friction, surface area increases air resistance

define satellite

an object that travels around another object

what does a centripetal force do?

causes objects to move in a circular path

describe a satellite's movement

satellites follow a circular path because they are moving forward while gravity pulls it down

what is geosynchronous orbit?

a object that orbits earth every 24 hours