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Forces and Motion

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Forces are pushes or pulls that cause objects to move, stop, or change direction. Motion refers to the movement of an object. Newton?s Laws of Motion explain how forces interact with objects. The first law, known as inertia, states that an object will stay at rest or continue moving at a constant speed unless acted upon by an external force. The second law relates force, mass, and acceleration using the formula F = ma. The third law states that every action has an equal and opposite reaction. Friction is a force that resists motion when two surfaces rub against each other. Gravity is another force that pulls objects toward the center of Earth. Understanding forces and motion helps us design better vehicles, improve safety equipment, and understand natural phenomena like earthquakes and tides.

Key Points
Isaac Newton formulated the laws of motion.
Inertia is resistance to change in motion.
The unit of force is the newton (N).
Gravity gives objects weight.
F = ma stands for Force = mass ? acceleration.
Friction slows down moving objects.
Air resistance is a type of friction.
Newton?s third law explains rocket propulsion.
Seatbelts apply Newton?s first law.
Skateboarding shows all three laws in action.
The Earth?s gravity is 9.8 m/s?.
Motion is measured using speed and direction.
Acceleration is the rate of change of velocity.
Mass is different from weight.
A heavier object requires more force to move.
Objects in space move due to inertia.
Friction creates heat.
Bicycles use friction to stop.
Forces are vector quantities.
Free fall is motion under gravity alone.
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