4.5.1.2 Contact and non-contact forces
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8 Terms
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force
a push or pull that acts on an object due to the interaction with another object.
vector quantity
vector quantity
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contact forces
the objects are physically touching
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non-contact forces
the objects are physically separated
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Examples of contact forces
friction, air resistance, tension and normal contact force.
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Examples of non-contact forces
non-contact forces are gravitational force, electrostatic force and magnetic force.
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what is an interaction pair
when two objects interact, there Is a force produced by both objects
an interaction pair is a pair of forces that are equal and opposite and act on two interacting objets (newtons third law)
an interaction pair is a pair of forces that are equal and opposite and act on two interacting objets (newtons third law)
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force of the sun and earth
the sun and the earth are attracted to each other by the gravitational force
this is a non-contact force
an equal but opposite force attraction is felt by both the sun and the earth
this is a non-contact force
an equal but opposite force attraction is felt by both the sun and the earth
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a chair and the ground
a chair exerts a force in the ground
whilst the ground pushes back at the chair with the same force (normal contact force)
equal but opposite forces are felt by both the chair and the ground
whilst the ground pushes back at the chair with the same force (normal contact force)
equal but opposite forces are felt by both the chair and the ground