According to Newton's third law, what other force must be happening?
The gas pedal is pulling on Marie's foot. The gas pedal is pushing on Marie's foot.
Isaac Newton was born in the 1600s and studied how objects move. He discovered three fundamental laws about forces and motion. According to Newton's third law, for every force, there is an equal and opposite force.
Consider the following force:
Marie's foot is pushing on her car's gas pedal.
According to Newton's third law, for every force, there is an equal and opposite force. This means that if one object is applying a force on a second object, the second object must also be applying a force on the first object, but in the opposite direction.
For example, if your hand is pushing down on a table, the table is also pushing up on your hand. Or, if you are pulling forward on a rope, the rope is also pulling back on you.
Marie's foot is pushing on the gas pedal. So, Newton's third law tells you that the gas pedal is pushing on Marie's foot.