Kinetics of Particles: Force and Acceleration

Example: Block on an Incline

Example

A 10 kg10 \text{ kg} block rests on a smooth (frictionless) plane inclined at 3030^\circ to the horizontal. If the block is released from rest, determine its acceleration down the plane and the normal force exerted by the plane.

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Example: Vehicle on a Banked Curve

Example

Determine the banking angle θ\theta required for a road with a radius of curvature of 200 m200 \text{ m} so that a car traveling at 25 m/s25 \text{ m/s} does not rely on friction to stay on the road.

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Example: Pulleys and Dependent Motion

Example

Two blocks, A (mA=10 kgm_A = 10 \text{ kg}) and B (mB=15 kgm_B = 15 \text{ kg}), are connected by a single light inextensible cable passing over two smooth pulleys. Block A rests on a horizontal frictionless surface, and Block B is suspended vertically. Determine the acceleration of each block and the tension in the cable when released from rest.

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Example: Conceptual Case Study - Apparent Weight in an Elevator

Example

A person of mass mm stands on a scale inside an elevator. The reading on the scale represents the normal force exerted by the scale on the person, which is their "apparent weight." Analyze the apparent weight of the person when the elevator is accelerating upwards, accelerating downwards, moving at a constant velocity, or in free fall.

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Example: Conceptual Case Study - Aerodynamic Drag vs. Velocity

Example

A skydiver jumps from a plane and falls towards the earth. Initially, the only significant force acting on them is gravity. However, as their velocity increases, the aerodynamic drag force (air resistance) becomes significant. Analyze how their acceleration changes over time and define the concept of terminal velocity based on Newton's Second Law.

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