science Flashcards
What is Friction?
A force that acts in a direction opposite the motion of an object (a force repelling the motion)
Factors that affect the amount of friction:
- Force between objects
2.Type of Surface
3.Surface Area
Types of Friction:
- Static Friction
- Sliding Friction
- Rolling Friction
- Fluid Friction
What is Gravity?
force of attraction between all objects in the universe
Mass: (based on our notes)
greater mass=greater gravity, all objects have mass
Distance: (based on our notes)
Greater distance=less gravity
G-Force (based on our notes)
A force of gravity on your body
What does positive G force do? (+G)
feel heavy/gravity pulling you down
What does Negative G force do?
(-G)
feel light/lifting out of seat
What is the number limit of G forces that you can experience before it’s dangerous?
4 g forces
What is the formula for weight?
Mass x 9.8 earths gravity
What is weight?
The measure of the force of attraction between objects due to gravity
What is acceleration?
the rate of change in velocity (speeding up or slowing down)
What is positive acceleration?
Speeding up
What is negative acceleration?
Slowing down
What is Air Friction?
air friction is a force of air that acts against the falling object
What is Terminal Velocity?
The point where a falling object no longer speeds up (starts falling at a constant speed)
What is a Simple Machine?
one machine with one or few moving parts
What does a Simple Machine do?
It makes work easier (But does not make less work)
What is Input Force?
Force applied TO the machine
What is Output Force?
Force applied BY the machine
What is a Lever?
A simple machine with a fixed pivot point (fulcrum)
Where is the Fulcrum in Class 1 Of levers?
The middle (seesaw example)
Where is the Fulcrum in Class 2 of the levers?
The front (wheelbarrow example)
Where is the Fulcrum in Class 3 of the levers?
The bottom (fishing pole example)
