Question

ryan skates on his rollerblades at a skate park near his home. match each of newtons laws of motion to the statement it best describes. newtons first law of motion newtons second law of motion newtons third law of motion the ground exerts the same magnitude of force onto ryans rollerblades that his rollerblades exert onto the ground. ryan will continue rollerblading forward until he pushes off the ground to turn. ryan has to push harder on the ground to accelerate when he is wearing his backpack than when he is not.

Explanation:

Newton's first law (law of inertia) states an object in motion stays in motion and an object at rest stays at rest unless acted upon by an external force. So "Ryan will continue rollerblading forward until he pushes off the ground to turn" describes it. Newton's second law is $F = ma$ (force equals mass times acceleration). When Ryan has a backpack (more mass), he needs more force to accelerate, so "Ryan has to push harder on the ground to accelerate when he is wearing his backpack than when he is not" describes it. Newton's third law states for every action there is an equal and opposite reaction. Thus "The ground exerts the same magnitude of force onto Ryan's rollerblades that his rollerblades exert onto the ground" describes it.

Answer:

Newton's first law of motion: Ryan will continue rollerblading forward until he pushes off the ground to turn.
Newton's second law of motion: Ryan has to push harder on the ground to accelerate when he is wearing his backpack than when he is not.
Newton's third law of motion: The ground exerts the same magnitude of force onto Ryan's rollerblades that his rollerblades exert onto the ground.