# Calculate the force the professor exerts on the cart in Figure 4.10 using data from the previous

## Question:

Calculate the force the professor exerts on the cart in Figure 4.10 using data from the previous example if needed.

**Strategy**

If we now define the system of interest to be the cart plus equipment (System 2 in Figure 4.10), then the net external force on System 2 is the force the professor exerts on the cart minus friction. The force she exerts on the cart, F_{prof}, is an external force acting on System 2. F_{prof} was internal to System 1, but it is external to System 2 and will enter Newton's second law for System 2.

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