Pulls on a Crate of Mass M That Is in Contact

question 96

Multiple Choice

pulls on a crate of mass m that is in contact with a rough surface. The figure shows the magnitudes and directions of the forces that act on the crate in this situation. represents the weight of the crate. represents the normal force on the crate, and represents the frictional force.
-Which statement best describes the motion of the crate?

• A)The crate must be at rest.
• B)The crate must be moving with constant velocity.
• C)The crate must be moving with constant acceleration.
• D)The crate may be either at rest or moving with constant velocity.
• E)The crate may be either at rest or moving with constant acceleration.

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