when a body is in equilibrium than its what have to be zero
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If a body has a non-zero acceleration, it means that its velocity is changing. The cause of a velocity change is an unbalanced force. Thus if a body has non-zero acceleration, it is not in equilibrium.
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If a body has a non-zero acceleration, it means that its velocity is changing. The cause of a velocity change is an unbalanced force. Thus if a body has non-zero acceleration, it is not in equilibrium.
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Can a body be in equilibrium with uniform speed and acceleration?
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2 ANSWERS

Mark Lundquist, Much less of a physicist than Joshua Engel.
Answered Jan 19
Well yeah, if the body remains “in equilibrium” (in the relevant Newtonian mechanical sense here), then by definition there is zero net force acting on the body, so it has a constant acceleration of zero, and therefore a constant velocity.
Obviously zero acceleration is the only acceleration compatible with constant velocity, because nonzero acceleration (again by definition) means nonzero change in velocity, i.e. nonconstant velocity. If a body has nonzero acceleration, then its velocity is changing, because that’s what acceleration means.
And if a body has nonzero acceleration, then it is feeling a nonzero net force and is not in equilibrium.
Hope that helps!
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2 ANSWERS

Mark Lundquist, Much less of a physicist than Joshua Engel.
Answered Jan 19
Well yeah, if the body remains “in equilibrium” (in the relevant Newtonian mechanical sense here), then by definition there is zero net force acting on the body, so it has a constant acceleration of zero, and therefore a constant velocity.
Obviously zero acceleration is the only acceleration compatible with constant velocity, because nonzero acceleration (again by definition) means nonzero change in velocity, i.e. nonconstant velocity. If a body has nonzero acceleration, then its velocity is changing, because that’s what acceleration means.
And if a body has nonzero acceleration, then it is feeling a nonzero net force and is not in equilibrium.
Hope that helps!
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