Contact & Non-contact Forces- Physics
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8 Terms
What is a force?
A push or pull acting on an object because of its interaction with another object.
How do we describe a force vector?
By its magnitude (in newtons) and its direction.
What is the key difference between contact and non‑contact forces?
Contact forces require physical touching; non‑contact forces act through empty space.
Name two common contact forces.
Friction and tension (also air resistance and normal force).
What does the normal contact force do?
It is the support force a surface exerts upward on an object resting on it, balancing the object's weight.
Give an example of a non‑contact force.
Gravitational force – Earth attracts you even without touching.
How does the strength of non‑contact forces change with distance?
It decreases according to an inverse‑square relationship (strength ∝ 1⁄r²).
What are the two possible actions of magnetic forces?
Attraction or repulsion, depending on the magnetic poles involved.
Note 
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