- The LIE is C. Drake’s foot pushing on the boat is a reaction force.
- Gravity pulls Drake downward, causing him to fall into the water after losing his balance. Friction between Drake’s foot and the dock (and between the boat and the water) affects how easily he can step off and how much the boat slides; low friction allows the boat to move more freely.
- The LIE is A. Crashing into the mailbox is a reaction force.
- The child crashing into the mailbox is not a reaction force; it is the result of inertia and lack of control. The reaction force would be the mailbox pushing back on the child/bike at the moment of impact.
- The LIE is B. Travis’s feet pushing on the road is a reaction force.
- Travis’s feet pushing on the road is the action force; the road pushing back on his feet is the reaction force that propels him forward.
- The LIE is C. The bird’s wings pushing down on the air is a reaction force.
- The bird’s wings pushing down on the air is the action force; the air pushing up on the wings is the reaction force that provides lift.
- The LIE is A. The ladder pushing against Malone’s paws is a reaction force.
- The ladder pushing against Malone’s paws is the reaction force; Malone’s paws pushing against the ladder is the action force.
- The LIE is B. The two forces that keep their bodies in motion are gravity and friction.
- Gravity and friction do not keep bodies in motion; they typically oppose or alter motion. The forces keeping them in motion are the action-reaction pairs from their own propulsion (e.g., legs pushing off ground, wings flapping).
Parent Tip: Review the logic above to help your child master the concept of action reaction worksheet.
