Question
A. A ball being thrown upward and then being caught. B. A child swinging on a swing, going higher and higher before slowing down and coming to a stop C. A dog walks to his bowl, stops to drink water then goes back to his bed.
Answer
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(278 Votes)
Vaughn
Master · Tutor for 5 years
Answer
A. A ball being thrown upward and then being caught. B. A child swinging on a swing, going higher and higher before slowing down and coming to a stop C. A dog walks to his bowl, stops to drink water then goes back to his bed.
Explanation
## Step 1:In the first scenario, a ball is thrown upward and then caught. The forces acting on the ball comprise two parts. The first part is inertia, which keeps the ball moving upwards at the beginning. As the ball attains maximum height, inertia is fully overcome by gravity, which begins to pull the ball downwards until it is caught. This involves gravitational potential energy, kinetic energy, and the conversion between them.## Step 2:In the second scenario, a child is swinging on a swing, going higher before slowing down and coming to a stop. Physical laws of speed, gravity, and kinetic energy, among others, come into play, particularly if a push force is included. As the swing rises, it converts speed into height (potential energy). When the swing falls, it converts potential energy into speed (kinetic energy). When it is stopped, mechanical energy is dissipated.## Step 3:The third scenario is different from the first two in that it doesn't involve much dynamics. The dog simply walks to the bowl, halts ('stops') its forward momentum to drink water, then returns ('goes back') to the bed. This is a to-and-fro motion using straightforward kinetic energy without much variable forces.