An object is moving to the right in a straight line. The net force acting on the object is also directed to the right, but the magnitude of the force is decreasing with time. The object will

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Consider the situation: an object moving to the right has a net force also directed to the right, but the magnitude of that force is decreasing with time.

Option 1: continue to move to the right, with its speed increasing with time. Since the force is still to the right, the acceleration a = F/m is positive, though decreasing in magnitude. A positive acceleration means the velocity to the right increases over time, so the speed increases even though the acceleration is getting smaller.

Option 2: continue to move to the right with a constant speed. Constant speed would require acceleration to be zero. Here the net force is not zero (it is positive, just decreasing), so acceleration is not zero, hence the speed cannot remain constant.

Option 3: continue to move to the right, with its speed decreasing with time. A decreasing speed would require a negative acceleration (opposite to the direction of motion). The net force remains to the right and positive, so the acceleration is not opposite to the motion; therefore the speed does not decrease.

Option 4: stop and then begin moving to the left. This would require the velocity to drop to zero and then reverse, which would occur only if the net force acted to decelerate the object enough to reverse direction. Since the force remains to the right (positive) for the duration described, it will not cause the object to stop and reverse on its own while it is still being applied.

In summary, with a positive but diminishing force to the right, the object keeps moving right and its speed increases (though the rate of increase slows over time).

SPHY001 Practice Quiz - Unit 05 | LA045

An object is moving to the right in a straight line. The net force acting on the object is also directed to the right, but the magnitude of the force is decreasing with time. The object will

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