Contact forces
Contact forces
The atoms(原子)in asolid material can bethought of as ballsCconnected by springs (弹簧).C自容O生The ‘springs' are actuallyelectromagneticforcesbetween the electronsand protons in the atoms
The atoms (原子) in a solid material can be thought of as balls connected by springs (弹 簧). The ‘springs’ are actually electromagnetic forces between the electrons and protons in the atoms
正压力Normal forceBrickTableWhen something compresses the springsthey push back with enough force to balancethe compressing force
Normal force 正压力 When something compresses the springs, they push back with enough force to balance the compressing force
Normal force FnFBiickNTable“Normal' is another word for ‘perpendicular'(垂直).Thedirectionofthenormalforceisnormal to the surface
Normal force FN ‘Normal’ is another word for ‘perpendicular’ ( 垂直). The direction of the normal force is normal to the surface. FN
摩擦力FrictionappliedFriction is caused by interactions between theatoms in two surfaces trying to slide past eachother
Friction 摩擦力 Friction is caused by interactions between the atoms in two surfaces trying to slide past each other