contact and non contact forces Flashcards
(19 cards)
Force:
A force is a push or pull that acts on an object due to their interaction with another object.
What are all forces between objects?
-contact forces
-non-contact force
Contact force:
the objects are physically touching
Non-contact force:
the objects are physically separated
Examples of contact forces:
friction
air resistance/drag
tension
normal contact force
upthrust
thrust
push
pull
lift
Examples of non-contact forces:
weight
magnetic force
electrostatic force
gravitational force
Upthrust:
the upward force that is exerted on an object that is in or on a fluid
Friction:
the force that opposes the movement of an object sliding over a surface
Lift:
the force on the wings of an aircraft that keeps it flying
Tension:
force transmitted through a cable or a string when pulled on by forces acting on its opposite ends
Normal contact force:
the force that a solid surface exerts against an object on a right angle
Drag/air or water resistance:
the force that acts against an object moving through a fluid
Thrust:
the force causing an object to move e.g. propulsive force of an engine
What forces occur when a skydiver falls through the air?
A force of air resistance acts when the air particles collide with the parachute. This causes air resistance to act upwards.
Electrostatic force:
the force between charged particles e.g. attraction and repulsion, like charges repel and opposite charges attract
Magnetic force:
the force experienced by an object in certain magnetic fields
Gravitational force:
the force of attraction that exists between any two objects with mass. It pulls all objects towards each other,
What effect do forces have?
Forces have the power to change the state of motion or shape of an object. They can make an object move, stop moving, speed up, slow down, change direction, or even change its shape.
What type of quantity is force?
Because the magnitude and direction of a force are both important, force is a vector quantity.
