Theory of Machine
The dynamic friction is the friction experienced by a body, when the body

None of these
Just begins to slide over the surface of the other body
Is in motion
Is at rest

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Theory of Machine
Which of the following is false statement in respect of differences between machine and structure?

Efficiency of machines as well as structures is below 100 %
In machines, relative motion exists between its members, whereas same does not exist in case of structures
Machines transmit mechanical work, whereas structures transmit forces
Machines modify movement and work, whereas structures modify forces

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