Kinematics of Particles

Example: Braking Vehicle

Example

A car traveling on a straight highway at an initial speed of v0=25m/sv_0 = 25 \, \text{m/s} (approx. 90km/h90 \, \text{km/h}) applies its brakes and decelerates uniformly at a=5m/s2a = -5 \, \text{m/s}^2. Determine the time required for the car to come to a complete stop and the total stopping distance.

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Example: Radar Tracking

Example

A radar station tracking a rocket records its distance r=10,000mr = 10,000 \, \text{m} and angle θ=30\theta = 30^\circ at a certain instant. The tracking data indicates that r˙=500m/s\dot{r} = 500 \, \text{m/s}, r¨=20m/s2\ddot{r} = 20 \, \text{m/s}^2, θ˙=0.05rad/s\dot{\theta} = 0.05 \, \text{rad/s}, and θ¨=0.01rad/s2\ddot{\theta} = -0.01 \, \text{rad/s}^2. Determine the velocity and acceleration vectors of the rocket in terms of their radial and transverse components.

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Example: Projectile Firing

Example

A projectile is fired from the ground with an initial velocity of KaTeX can only parse string typed expression at an angle of 4040^\circ with the horizontal. Determine the maximum height reached and the horizontal range of the projectile.

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Example: Vehicle on a Curve

Example

A race car is traveling along a circular curve of radius KaTeX can only parse string typed expression. At a specific instant, its speed is KaTeX can only parse string typed expression and the driver is pressing the gas pedal, increasing the speed at a constant rate of KaTeX can only parse string typed expression. Determine the magnitude of the total acceleration of the car.

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Example: Conceptual Case Study - Satellites in Orbit

Example

Two identical satellites, A and B, are orbiting the Earth in circular paths. Satellite A is in a low Earth orbit (LEO), while Satellite B is in a much higher geosynchronous orbit (GEO). The central force (gravity) acting on both satellites provides the normal acceleration required for circular motion. Analyze and compare their tangential velocities, angular velocities, and normal accelerations based purely on kinematic principles and the inverse-square law of gravity.

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Example: Conceptual Case Study - Roller Coaster Dynamics

Example

A roller coaster car is designed to travel through a vertical loop. The safety of the passengers depends heavily on the kinematics of the car, particularly its velocity and acceleration at the top and bottom of the loop. Describe the critical kinematic conditions required for the car to successfully navigate the loop without the passengers experiencing zero normal force (feeling "weightless") at the top, and explain the role of tangential and normal components of acceleration.

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