Newton's Second Law of Motion, First Law, Equations, Worksheet, Examples - Physics (Mechanics)

Newton's laws of motion describe the relationship between an object's motion and the forces acting on it: the first law states that an object at rest stays at rest and an object in motion stays in motion unless acted upon by an external force; the second law states that the force (\(F\)) on an object is equal to its mass (\(m\)) times its acceleration (\(a\)) (\(F=ma\)); the third law states that for every action, there is an equal and opposite reaction.

💡Newton's First Law of Motion
• Concept: An object's state of motion remains unchanged unless an external, unbalanced force acts on it.
• Inertia: This law is also known as the law of inertia, which is an object's resistance to a change in its state of motion. Objects with more mass have more inertia.
• Example: When a car stops suddenly, the passengers continue to move forward because of their inertia.

💡Newton's Second Law of Motion
• Concept: The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
• Equation: This is expressed as the formula \(F=ma\).
• Example: A stronger force is required to accelerate a heavier object than a lighter one.

💡Newton's Third Law of Motion
• Concept: For every action, there is an equal and opposite reaction.
• In action: When one object exerts a force on a second object, the second object simultaneously exerts a force equal in magnitude and opposite in direction on the first object.
• Example: A spacecraft's engines push hot gases downward (action), and the gases push the spacecraft upward with an equal and opposite force (reaction).

💡Worksheets are provided in PDF format to further improve your understanding:
• Questions Worksheet: https://drive.google.com/file/d/1pD8nvbATuuSwvLF_nueB2KSc685rnQKr/view?usp=drive_link
• Answers: https://drive.google.com/file/d/1SYKZihxmNSOL5K4ZQI663PIthUBqC9hs/view?usp=drive_link

💡Chapters:
00:00 Newton's second law of motion
02:15 Newton's first law
03:40 Worked examples

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