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Objectives
Objectives
- Describe Aristotle’s concept of motion.
- Describe Copernicus’ idea about Earth’s motion.
- Describe Galileo’s idea about when a force is needed to keep an object moving.
- State Newton’s first law of motion.
- Describe the relationship between mass and inertia.
- Explain how the law of inertia applies to objects in motion.
- Distinguish between force and net force.
- Distinguish between normal force and weight.
- State the relationships between acceleration, mass and net force.
- State and explain Newton’s second law of motion.
- List the factors that affect the force of friction between surfaces.
- Explain why the acceleration of an object in free fall does not depend upon the mass of the object.
- Define force as part of an interaction.
- State Newton’s third law of motion.
- Describe how to identify a pair of action–reaction forces.
- Explain why the accelerations caused by an action force and by a reaction force do not have to be equal.
- Explain why an action force is not cancelled by the reaction force.
- Explain what must occur in every interaction between things.
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