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Question

Opening a door is an example of:
  1. Contact force
  2. Non contact force
  3. Spring force
  4. Magnetic force

A
Contact force
B
Non contact force
C
Magnetic force
D
Spring force
Solution
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Opening a door requires our hand to apply force by pushing and pulling which is a contact force. There is some frictional force in the door hinge, against that we apply force. The hinge friction is again a contact force.

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