Students explore and measure the rate of spherical objects rolling down a ramp. They discuss why different ramps work better than others, and practice procedures for testing designs and recording results.

Second graders analyze the composition of different balls. In this science instructional activity, 2nd graders create their own balls using materials provided by teacher. They demonstrate what their invention can do.

Students participate in activities about the five senses. They explore objects, listen to stories and discuss the senses with classmates.

Fourth graders predict, observe, and compare what happens when a force is applied to an object. In this forces lesson, 4th graders complete a 'swinging hammer' activity to learn about forces and motion.

Students investigate friction between different surfaces. In this physics lesson plan, students research biomaterials that can reduce friction. They calculate efficiency using a mathematical formula.