We reveal various aspects of force with simple experiments and ask the students to extrapolate to Newton's three laws.
We hope to demonstrate Newton's three laws in a series of simple experiments. However, we will not immediately present Newton's law but ask the students to write mathematical expressions concerning force. After the students make some effort, we will reveal the three laws and their vector nature.
Ask the students, in pairs, to stand push on their partners hand. The partner should resist, yield, push in a different direction. When pushing hard and in equilibrium with their partner, ask the students how their feet are participating in the experiment. Ask the students to record everything they noticed about the hand to hand forces. Think in mathematical terms.
Give every team a bowling ball (basketball will work). Set it on the floor and watch what it does. (Hopefully, nothing.) Ask them to roll the ball slowly back and forth using as much distance as the room and safety will allow. Ask them to consider an ideal ball and perfectly flat frictionless floor. Record what happened and how the two experiments (moving and not moving) might be related.
Take the class to a gymnasium-like room with a large smooth floor. Bring the piano trollies, ropes, masking tape and scales. (It will make things go faster if the instructor puts strips of tape on the floor prior to class meeting. The strips should be two or three meters long and be placed at one meter intervals.) Tell the students that they are to investigate the relationship between force and motion. Let them apply the scientific method to devise a hypothesis and some experiments to test the hypothesis. The scales, ropes, and trollies should provide a hint about how to proceed. They should discover that more force provides more acceleration and more mass decreases acceleration. If they don't discover these facts, at least they will have some fun with the trollies.
The students now have enough information to state Newton's three laws of motion. Without too much direction, encourage them to summarize, in one or two sentences, what they just discovered. Remember the Newton was one of humankind's greatest intellects so if the students cannot state the three laws in five or ten minutes, its probably OK. After they struggle for a while, reveal how Newton described these experiments with his three laws.