Third grade physical science activity according to PA standards for science focuses on which concept?

• A. Exploring the properties of sound waves in air.
• B. Understanding how heat travels through convection.
• C. Measuring the period of pendulum motion.
• D. Exploring energy's ability to cause motion or create change.

Answer: (D)

Energy and its ability to cause motion or create change is the main idea being tested. In third grade, PA science standards introduce energy as a way to explain why things move and how they can change, connecting everyday observations to a unifying concept. An activity that centers on energy helps students see how energy moves, transforms, or transfers to produce motion or outcomes—like a ball rolling, lights turning on, or objects being pushed. This broad focus gives students a concrete foundation to understand many physical phenomena, which is why it fits best for this grade level. The other topics are important science ideas too, but they describe more specific phenomena rather than the overarching role of energy in causing motion and change.