Have students each blow up a balloon, then hold the opening toward the ground. Have the students let go and observe what happens as the air is expelled from the balloon. Have students repeat the experiment several times, each time noticing what is happening between the balloon, the air inside and the surface below the balloon. Students will observe the effect of the force of the air on the balloon, as well as the force of the balloon on the air.
Have the students observe vehicles passing by. Advise students to note which direction the wheels are turning and how force is being applied from the tires to the road and the road to the tires. Students should record what happens as a result of the force being applied, i.e. the vehicle moves forward or backward. Students will observe the effect of the force applied by the tires on the road, as well as the effect of the force applied by the road on the tires.
Have each student kick a ball on one of the school ball fields. Have all students observe what is happening as force is applied by the students' leg to the ball and as the force from the ball is felt in their leg. This experiment will enable students to experience the flow of force firsthand. Allow the students to kick the ball several times at various speeds and exerting various levels of force. Each time the student should record the difference in the feeling in their leg from the force coming from the ball.
Tape two rulers to a table, parallel to each other, allowing just enough space between the two for a row of pennies. Place a row of five pennies between the rulers and provide a student with a sixth penny. Have the student flick the penny between the rulers and observe the movement of the other five pennies. To flick the penny the student should lay the penny flat on the table at the edge of the rulers and use his finger to rapidly push the penny toward the row of pennies. Enable students to try flicking two pennies at the row of coins and observe what happens. This experiment will allow students to see the movement of the force across objects when obstacles arise, as well as see how the force reactions are caused.