The three situations in which unbalanced forces are acting on the objects are:
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A basketball gaining speed as it rolls down a ramp.
- Unbalanced forces are acting on the basketball as it accelerates down the ramp due to gravity.
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A rollercoaster slowing down as it nears the top of a hill.
- Unbalanced forces are acting on the rollercoaster as it experiences a decrease in speed, indicating that the forces are not in equilibrium.
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A race car moving at a constant speed around a circular track.
- While the speed is constant, the direction is changing, which means there is an unbalanced force acting on the car (centripetal force) to keep it moving in a circular path.
The other situations involve either balanced forces (the motorcycle parked in a driveway is at rest, and thus forces are balanced) or constant speed in a straight line (which also indicates balanced forces, as in the case of the car moving at a constant speed).