Friction
What is friction?
The force that two surfaces exert on each other when they rub against each other.
Mrs. Lathrop knocks over her coffee cup. Balanced Force or Unbalanced Force?
Unbalanced
What force acts opposite to moving objects?
Air Resistance or Drag
Falling objects with a greater ____________ _________ experience more air resistance.
Surface Area
What tool did Galileo improve upon?
Telescope
What are the two factors that affect friction?
1-How hard the surfaces are pushed together
2- The type of surfaces involved
When all forces are heading in one direction, how do you figure out the net force? Add or Subtract
Add
Why does the Earth have more gravity than the Moon?
It has more mass.
An object that is thrown is called a what?
Projectile
The force of gravity on a person or object at the surface of a planet is called what?
Weight
Friction that acts on objects that are not moving is called what?
Static Friction
When two forces are equal and opposite from each other, what is the net force?
Zero
Distance
When the only force acting on an object is gravity, the object is said to be in _______ _______.
Free Fall
What did Galileo discover about the Earth as it relates to the sun?
The Earth travels around the sun. The sun does not revolve around the Earth.
The friction that occurs when an object moves through a gas or liquid is called what?
Fluid Friction
What unit is force measured in?
Newtons
9.8m/s2
All objects in free fall accelerate at the same rate regardless of their __________.
Mass
The greatest velocity a falling object reaches is called what?
Terminal Velocity
Friction acts in a direction _____________ to the direction of an object's motion.
Opposite
What is the downward force that affects all objects?
Gravity
What does the Law of Universal Gravitation state?
The force of gravity acts between all objects in the universe.
When the upward force of air resistance on an object becomes equal to the downward force of gravity on the same object, the force on the object is: balanced or unbalanced?
Balanced
What is the highest height that a cat survived a fall from a building?
42 stories