Physics · Unit 2 · Linear motion and force · Linear motion
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A physics student investigates the motion of three different objects and records the following observations: Refer to the scenario below. Which of Newton's three laws of motion is best demonstrated by each observation? Justify your answer by describing the relevant law in each case.
A student investigates the motion of three objects and records the following observations: **Observation 1:** A hockey puck sliding across smooth ice continues moving in a straight line at constant speed until it strikes the boards. **Observation 2:** A tennis ball of mass 58 g experiences a net force of 120 N during a serve, causing it to accelerate. **Observation 3:** A skateboarder pushes backward on the ground with their foot and the skateboard moves forward. Deduce which law of motion is demonstrated by each observation and justify your conclusion by describing the relevant law.