Question

Select the three statements that are examples of work.(3 points)
Responses

A cat walks from the bushes to the garage
A cat walks from the bushes to the garage

A teacher gives a lecture in class.
A teacher gives a lecture in class.

A baseball player throws a ball across a field.
A baseball player throws a ball across a field.


A woman picks up a bag of groceries.

A woman picks up a bag of groceries.

A student carrying a big stack of books and walks them to math class.
A student carrying a big stack of books and walks them to math class.

A father pushes a baby in a carriage.
A father pushes a baby in a carriage.
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Answer 1

The examples of work are:

- A baseball player throws a ball across a field. (A force acts on the ball and causes displacement.)
- A woman picks up a bag of groceries. (A lifting force acts upward while the bag is displaced upward.)
- A father pushes a baby in a carriage. (A horizontal force causes the carriage to move.)

Work requires a force causing displacement in the direction of the force; the other scenarios do not meet that condition in the usual physics sense.