p9 Flashcards
name three non-contact forces
gravitational, electrostatic and magnetic
what does gravity at between?
all masses
is gravity, attractive or a positive
always attractive
what do magnetic fields act between?
magnetic poles
when are magnetic fields, attractive and repulsive?
unlike poles, attract, like poles repel
what do electrostatic fields at between?
charged objects
when are electrostatic feels attractive and repulsive
unlike charges attract like charges repel
name two contact forces
no more reaction, force and friction
what is fiction?
A force that acts in opposition to the pushing force that is trying to change the object motion
what is the normal contact force?
The force that acts upwards in opposition to the weight of objects
what is the difference between effect on a scale of?
Vector has magnitude and direction scaler has magnitude
what does the length of the arrows represent in a vector diagram?
The size of the force
what is a resultant force?
The single force that would have the same effect as all of the other forces acting on the object
how do you work out the resultant force if the forces are acting in the same direction?
add them all together
how do you workout the resultant force is the forces of parallel but acting in opposite directions
subtracting from one another
