Chapter 8 Flashcards
(28 cards)
What is tension force/ example
Force experienced by a wire or a rope when it is pulled at either end
Ex rope being pulled
What is friction force/ example
works to slow down or stop motion due to surfaces rubbing against each other
Ex tires on the road
What is elastic force/ example
Is exerted when a spring like object such as a trampoline restores itself to normal shape after it has been compressed or stretched
Trampoline
What is gravitational force/ example
The force of attraction between objects because they have mass
Ex person on earth
What is Electrostatic force/ example
Causes pushing and pulling forces
Ex lightning
What is magnetic force/ example
Acts in certain metals and compounds, have a field around then that can exert pushing and pulling forces
Ex magnet on a fridge
Unbalanced forces
Not equal in size, act in opposite directions, if they act on a non moving object, it can move.
Balanced forces
Same size, act in opposite directions, if they act on a non moving objects its will not move. If it is moving it will continue the same way and size
Difference between contact and action at a distance forces
Contact forces have to touch the object and action at a distance forces work from a distance
What is force measured in
Newtons
Pressure
The amount of force acting on a certain area on an object
Compression
A decrease in volume produced by a force
Deformation
A change of shape without being forced into a smaller volume
Pascal
Equal to 1 n/m2
Kilo pascal
More commonly used, equal to 1000 Pa
Why gases are compressible
Because it’s particles are very spread apart and able to move around
Why gases can explode
When heat is added the particles vibrate faster, the increased pressure can cause it to explode
Why gases can implode
Small amount of water was posed in a metal can, can was then heated with the cap off, when the can was removed from heat the cap was quickly screwed on. As the can cooled, the particles also cooled causing them to lose energy and contract, the contraction caused the pressure inside the can to become lower than air pressure outside the can, the air pressure on the outside pushed the walls of the can inward.
Why liquids and solids are hard to compress
The particles of solids and liquids are already so tightly packed together that squeezing them together is almost impossible
Formula for pressure
Force divided by area
Viscosity
The resistance of a fluid to flow
Adhesion
The attraction or joining or two different objects or fluids to each other
Cohesion
The strength with which the particles of an object or fluid attract to each other
Flow rate
The speed at which a fluid flows from one point to another
