Pedestrian Safety
What is the primary purpose of pedestrian safety measures?
The primary purpose of pedestrian safety measures is to reduce accidents and injuries involving pedestrians.
Define the difference between elastic and inelastic collisions. Provide an example of each and explain how momentum is conserved in both types of collisions.
Elastic Collision: Both momentum and kinetic energy are conserved. Example: Two billiard balls colliding.
Inelastic Collision: Momentum is conserved, but kinetic energy is not. Example: A car crash where vehicles crumple together.
Why is community input important in safety planning?
Community input is important in safety planning because it ensures that the needs and concerns of local residents are addressed.
What technology is used to enhance pedestrian safety at intersections?
Technologies used to enhance pedestrian safety at intersections include pedestrian-activated signals and flashing lights.
List two common pedestrian hazards in urban areas.
Common pedestrian hazards in urban areas can include: distracted drivers, poorly designed intersections, road conditions, distracted pedestrians.
Write down the equation that relates force, mass, and acceleration (Newton's Second Law).
The equation that relates force, mass, and acceleration is: F=m×a
This relationship indicates that for a given mass, an increase in force results in an increase in acceleration. Car devices can reduce the acceleration experienced by a pedestrian during a collision by extending the time over which the force is applied, it can help minimize injuries.
What role do local organizations play in promoting pedestrian safety?
Local organizations can promote pedestrian safety by organizing awareness campaigns, community walks, and educational workshops.
How do seatbelts and airbags protect passengers in a car collision?
In the event of a sudden stop or collision, the seatbelt helps to slow down the passenger's movement. It restrains the body, preventing it from continuing to move forward at the speed the vehicle was traveling.
In the event of a crash, sensors detect the collision and deploy the airbags within milliseconds. This rapid inflation creates a barrier between the passenger and the hard surfaces of the vehicle.
What role do crosswalks play in pedestrian safety?
Crosswalks provide a designated area for pedestrians to cross streets safely and alert drivers to the presence of pedestrians.
If an object collides with a brick wall, and the object has a mass of 30kg and it traveling at a velocity of 20m/s, what is the total momentum of the collision?
Momentum = Mass x Velocity
30 x 20 = 600
How can schools contribute to pedestrian safety education?
Schools can contribute to pedestrian safety education by teaching students safe walking practices and the importance of traffic rules.
What is the purpose of pedestrian detection systems in vehicles?
The purpose of pedestrian detection systems in vehicles is to identify pedestrians in the vehicle's path and alert the driver or activate automatic braking.
Explain how traffic signals can affect pedestrian safety.
Traffic signals control the flow of vehicles and pedestrians, ensuring that pedestrians can cross safely at designated times.
A bicycle with a mass of 15 kg is moving at a speed of 5 m/s. Calculate the momentum of the bicycle. Show your work and include appropriate units.
Using the formula: P = M x V
The momentum of the bicycle is 75
Why should you keep a longer distance between you and the car in front of you when it is snowy/rainy?
The stopping distance of a vehicle includes the distance traveled while the driver reacts to a hazard, plus the braking distance.
With longer distances, drivers have more time to assess the situation ahead and react accordingly.
Discuss the impact of pedestrian injuries on community health.
Pedestrian injuries can significantly impact community health by increasing healthcare costs and reducing the quality of life for victims.
If a car is moving at 10 km/hr and hits a stationary crash test dummy, what happens to the momentum of the combined system after the collision? Explain your reasoning based on the law of conservation of momentum.
The momentum of the combined system after the collision remains the same as before, which is 2780 kg m/s2780kg m/s. According to the law of conservation of momentum, in the absence of external forces, the total momentum before and after a collision is conserved. Therefore, the total momentum of the car-dummy system after the collision must equal the total momentum before the collision.
Can using you cell phone while driving help to reduce the number of car collisions every year?
NO!! Stay off your phone while driving.