Question: When is work done, and what units do we use for it ? When a force acts on a system that causes that system to

When is work done, and what units do we use for it?
When a force acts on a system that causes that system to be displaced some distance perpendicular to the force that caused it. We use units of Newtons.
When a force acts on a system that causes that system to be displaced some distance parallel to the force that caused it. We use units of Newtons.
When a force acts on a system that causes that system to be displaced some distance perpendicular to the force that caused it. We use units of Joules.
When a force acts on a system that causes that system to be displaced some distance parallel to the force that caused it. We use units of Joules.
When is work done, and what units do we use for

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