An object moving at a constant velocity will always have a what
2 answers:
<em><u>Answer:</u></em>
zero acceleration
<em><u>Explanation:</u></em>
<u>Acceleration</u> is defined as the rate change of velocity with respect to time
<u>This means that:</u>
Now, since the velocity is given as a constant, this means that the value of the velocity does not change which means that the change of velocity is zero.
<u>Substitute in the formula:</u>
<u>Therefore,</u> for constant velocity, the acceleration is zero.
Hope this helps :)
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In a real system of levers, wheel or pulleys, the AMA (actual mechanical advantage) is less than the IMA (ideal mechanical advantage) because of the presence of friction.
In fact, the IMA and the AMA of a machine are defined as the ratio between the output force (the load) and the input force (the effort):
however, the difference is that the IMA does not take into account the presence of frictions, while the AMA does. As a result, the output force in the AMA is less than the output force in the IMA (because some energy is dissipated due to friction), and the AMA is less than the IMA.
In fact, the IMA and the AMA of a machine are defined as the ratio between the output force (the load) and the input force (the effort):
however, the difference is that the IMA does not take into account the presence of frictions, while the AMA does. As a result, the output force in the AMA is less than the output force in the IMA (because some energy is dissipated due to friction), and the AMA is less than the IMA.