Parts of a Plant and Animal
Identifying and comparing the main external parts of common plants and animals.
Key Questions
- What are the main parts of a plant and what do they do?
- What are the main parts of an animal and what do they do?
- How are the parts of a plant and an animal similar or different?
NCCA Curriculum Specifications
About This Topic
Gravity and Free Fall transition students from simple terrestrial observations to the universal laws that govern the cosmos. This topic covers the acceleration due to gravity (g), the distinction between mass and weight, and the effects of air resistance on falling bodies. For the Leaving Cert, students must be proficient in using equations of motion to predict the behavior of projectiles and objects in free fall, a skill that is frequently tested in both mandatory experiments and theoretical questions.
This unit connects deeply to the history of science, referencing the work of Galileo and Newton. It provides the mathematical framework for understanding why objects fall at the same rate regardless of mass in a vacuum, a concept that often challenges student intuition. Students grasp this concept faster through structured discussion and peer explanation where they can debate the variables of terminal velocity.
Active Learning Ideas
Stations Rotation: Measuring 'g'
Students rotate through three stations using different methods to calculate g: a free-fall timer, a simple pendulum, and a ticker-tape timer. They compare the accuracy and sources of error for each method in their lab notebooks.
Simulation Game: Terminal Velocity Design
Students use digital tools to model a skydiver's fall, adjusting mass and parachute size to see the effect on terminal velocity. They then present their 'safe landing' parameters to the class.
Gallery Walk: Gravity on Other Worlds
Groups calculate the weight of a 70kg person on different planets and create posters showing the 'jump height' possible on each. Students walk around the room to compare how gravitational field strength varies across the solar system.
Watch Out for These Misconceptions
Common MisconceptionHeavier objects fall faster than lighter objects in all conditions.
What to Teach Instead
This ignores the role of air resistance. In a vacuum, all objects accelerate at the same rate; using a 'feather and coin' vacuum tube demonstration followed by peer teaching helps clarify that mass cancels out in the acceleration equation.
Common MisconceptionThere is no gravity in space or on the Moon.
What to Teach Instead
Gravity is everywhere; astronauts feel weightless because they are in a constant state of free fall. Collaborative problem-solving regarding satellite orbits helps students realize that gravity provides the centripetal force required for orbit.
Suggested Methodologies
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Frequently Asked Questions
What is the mandatory experiment for this topic?
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Why is 'g' different at the equator compared to the poles?
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