When Debbie pushes the first cart she is using an applied force. An applied force is created when someone or something pushes another thing using, of course, an applied force. Now, when the second cart is being pushed by the first cart, this is also an applied force. You can tell because the first cart is being pushed using forced and this causes the second cart to be pushed using some of the force that is being transmitted to the first cart. This means the completed sentence should look something like this...
Debbie exerts applied force on the first cart. The first cart exert applied force on the second cart.
- Marlon Nunez