Sandra and her dad go to the grocery story. As they do their shopping, Sandra's dad asks her about her homework. Sandra remembers that she is supposed to make a list of "real world" examples of energy transfer.

Question

Which of the following could be included on a list of examples showing an energy transfer to an object?

(2 points)
This DOES show an energy transfer to an object. This does NOT show an energy transfer to an object.
Sandra's dad stands still while he thinks about what is on the grocery list.

Sandra slides a gallon of milk out of the way to get a colder gallon from the back of the shelf.

Sandra sees a new kind of breakfast pastry sitting on a high shelf.

Sandra's dad pushes the grocery cart to make it start moving.

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Answer 1

Let's analyze each example in terms of energy transfer to an object:

1. Sandra's dad stands still while he thinks about what is on the grocery list.

   • This does NOT show an energy transfer to an object. There is no movement or energy being transferred to another object.

2. Sandra slides a gallon of milk out of the way to get a colder gallon from the back of the shelf.

   • This DOES show an energy transfer to an object. When Sandra slides the gallon of milk, she applies a force, which causes the milk to move, transferring kinetic energy to that object (the gallon of milk).

3. Sandra sees a new kind of breakfast pastry sitting on a high shelf.

   • This does NOT show an energy transfer to an object. Looking at the pastry doesn't involve any energy transfer to the pastry or any object.

4. Sandra's dad pushes the grocery cart to make it start moving.

   • This DOES show an energy transfer to an object. By pushing the grocery cart, he applies a force that causes it to move, transferring energy to the cart.

In summary:

• Energy Transfer Examples:

  • Sandra slides a gallon of milk out of the way to get a colder gallon from the back of the shelf.
  • Sandra's dad pushes the grocery cart to make it start moving.

• Non-Energy Transfer Examples:

  • Sandra's dad stands still while he thinks about what is on the grocery list.
  • Sandra sees a new kind of breakfast pastry sitting on a high shelf.