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Related Concept Videos

Impulse01:13

Impulse

According to Newton’s second law of motion, the rate of change of the momentum of an object is the net external force acting on it. The total change in momentum between two timepoints thus depends on both the external force acting on it and the time over which it acts. Describing this mathematically, the total change of an object’s motion is proportional to the force vector and the time over which it is applied. This product is called impulse.
Additionally, it can be shown that the total...
Variation in Acceleration due to Gravity near the Earth's Surface01:20

Variation in Acceleration due to Gravity near the Earth's Surface

An object's apparent weight is its weight measured by a spring balance at its location. It is different from its true weight, the force with which the Earth pulls it, because of the Earth's rotation. Mathematically, an object's apparent weight equals its true weight minus the centripetal force that keeps it in a circular motion along with the Earth's surface every 24 hours.
The difference between the true and apparent weights is proportional to the square of the Earth's angular speed. Since the...
Acceleration due to Gravity on Other Planets01:24

Acceleration due to Gravity on Other Planets

The gravitational acceleration of an object near the Earth's surface is called the acceleration due to gravity. It can be measured by conducting simple experiments on Earth. However, such an experiment is impossible to conduct on the surface of other planets.
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
Acceleration due to Gravity on Earth01:21

Acceleration due to Gravity on Earth

According to Newton's law of gravitation, the gravitational force on a body is proportional to its mass. According to Newton's second law of motion, the acceleration produced by an external force is inversely proportional to the force. Hence, the acceleration of an object under an external force of gravitation is independent of its mass.
The acceleration of an object close to the Earth, because of the Earth's gravitational pull, is called the acceleration due to gravity. It is always directed...
Acceleration due to Gravity on Earth00:55

Acceleration due to Gravity on Earth

Newton's second law is closely related to his first law of motion. It mathematically gives the cause-and-effect relationship between force and changes in motion. Newton's second law is quantitative and is used extensively to calculate what happens in situations involving a force. All external forces acting on a system add together to produce a net force Fnet. A larger net external force produces a larger acceleration. This acceleration is directly proportional to, and in the same direction as,...
Sight Distance in a Vertical Curve01:29

Sight Distance in a Vertical Curve

Sight distance on vertical curves is critical in roadway design. It ensures drivers can see far enough ahead to identify and respond to hazards effectively. This directly impacts safety, driver comfort, and the overall efficiency of the transportation network.Vertical curves are classified into crest and sag curves based on their geometry. For crest curves, sight distance is determined by the line of sight between a driver's eye and a small object on the road's surface. Design parameters for...

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Tactile Vibrating Toolkit and Driving Simulation Platform for Driving-Related Research
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Do elevated gravitational-force events while driving predict crashes and near crashes?

Bruce G Simons-Morton1, Zhiwei Zhang, John C Jackson

  • 1Division of Epidemiology, Statistics, and Prevention Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, 6100 Executive Boulevard, Room 7B13M, Bethesda, MD 20892-7510, USA. mortonb@mail.nih.gov

American Journal of Epidemiology
|January 25, 2012
PubMed
Summary

Elevated gravitational-force event rates in teen drivers can predict future crashes. Higher rates in the past month significantly increased the risk of a crash in the subsequent month.

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Area of Science:

  • Traffic safety research
  • Driver behavior analysis
  • Risk prediction modeling

Background:

  • Teenage drivers are at a high risk for crashes.
  • Predictive models for crash risk are crucial for intervention.

Purpose of the Study:

  • To determine if elevated gravitational-force event rates predict future crashes and near crashes in teenage drivers.
  • To assess the predictive accuracy of these events for near-future crashes.

Main Methods:

  • Installed accelerometers, GPS, and cameras in vehicles of 42 newly licensed teen drivers for 18 months.
  • Calculated rates of elevated gravitational-force events, crashes, and near crashes per mile driven.
  • Used generalized estimating equations with logistic regression and receiver operating characteristic curves for analysis.

Main Results:

  • A correlation of 0.60 was found between crashes/near crashes and elevated gravitational-force event rates.
  • Higher past-month elevated gravitational-force event rates substantially increased subsequent crash risk (odds ratio = 1.07).
  • Risk models demonstrated relatively high predictive accuracy (area under the curve = 0.76).

Conclusions:

  • Elevated gravitational-force event rates serve as a strong indicator for assessing crash risk in teenage drivers.
  • These event rates offer high predictive accuracy for identifying drivers at risk of near-future crashes.
  • The findings support the use of such data for proactive safety interventions.