Forces Flashcards
(40 cards)
What are contact forces ?
Contact forces can only have an effect on objects that they touch
Tension force ?
Tension force is force experienced by a wire or a rope when it is pulled at either end .
Friction force ?
Friction wok a to slow down or stop motion due to surfaces rubbing against each other .
Elastic force ?
Elastic force is entered when a spring-like object such as a trampoline restored itself to normal shape free it has been compressed or stretched .
Action- at-a-distance force ?
Apply forces to an object without touching it .
Gravitational force ?
Gravitational force is the force of attraction between objects because they have mass. Depends on the mass .
Electrostatic force ?
Electrostatic force ( static electricity) cause pushing and pulling forces. Negative goes with positive particles .
Magnetic force ?
Magnetic force acts on certain metals and compounds, iron, nickel, and cobalt .
How to measure mass ?
Use a balance scale
Will the mass change on another planet ?
Nope. Even thou the gravity is different , the mass will still be the same c:
Weight ?
Weight is the amount of force on an object due to gravity.
How to measure weight on earth ?
Multiply by 9.8
What do bathroom scales measure ?
They actually measure force, not mass.
Bathroom scale is a weight scale not a mass scale .
Mass ??
Amount of matter in an object
What do you use to measure force ?
Newtons .
What measuring unit is used to measure weight ?
Newtons because weight is a force .
How to measure force ?
Force meters are equipped with a spring or a similar elastic device that stretches or compresses in response to being pulled or pushed .
Most common type of force meter is called a Newton gauge or spring scale.
Balanced forces ?
Balanced forces are equal in strength and oppose each other in direction . Balanced forces keep an object moving at a constant speed and direction.
Unbalanced forces ?
Unbalanced forces cause a change in the speed or direction of an object . If forces remain unbalanced the box will continue to increase its speed .
Pressure ?
Pressure is the amount of force acting over a given area on an object.
Compression
Compression is a decrease in volume produced by a force .
Why are gases easily compressible ?
A gas can easily be compressed because there is a large amount of space between its particles.
Why does warmer particles expand ?
Heat = energy .
Energy makes the particles move faster which causes it to increase in size .
Increase pressure could cause an explosion .
Implosions ?
As a heated item cools causes them o lose energy. This contraction caused the pressure inside the can to become lower than air pressure outside the can. Air pressure on the outside pushed the walls of the can inward .
