a hockey stick pushes a puck across ice.
a free body diagram of the puck is shown below.
which forces on the puck result from the puck interacting with other objects (or materials)?
choose all answers that apply
a gravitational force ($f_{g}$)
b applied force ($f_{a}$)
c normal force ($f_{n}$)
d frictional force ($f_{f}$)

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# Brief Explanations:
- Gravitational force ($F_g$) is due to the interaction between the puck and the Earth.
- Applied force ($F_a$) is from the hockey - stick interacting with the puck.
- Normal force ($F_N$) is because of the interaction between the puck and the ice (a contact force).
- Frictional force ($F_f$) is due to the interaction between the puck and the ice (as the puck moves across the ice, there is a frictional interaction).

# Answer:
A. gravitational force ($F_g$), B. applied force ($F_a$), C. normal force ($F_N$), D. frictional force ($F_f$)

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