Investigation #3. Accidents will happen Investigating Kinetic Energy & Car Crashes. Opening questions. Different than below.
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Accidents will happen
Investigating Kinetic Energy & Car Crashes
On your way home from school you notice that the traffic ahead has slowed. You notice the flashing lights of fire trucks and police cars ahead. There has been an automobile accident.
What information do these detectives collect that helps them reconstruct the accident?
Why is the speed of a vehicle such an important factor in accidents?
KE Crime Scene Investigation – The Accident
There are certain times when friction stops slipping from taking place but actually creates motion! Friction prevents car tires from slipping. Without the friction between your car tires and the road, the tires would slip and the car would not move.
This is an example of friction creating motion. When friction causes an object to move we usually call it a traction force. But remember traction is really friction.
Investigating The Force of Friction
Focus Question: What factors influence the force of friction?
Your task will be to investigate the factors that influence the size of the force of friction and how it affects energy flow in a simple system.
Investigating Kinetic Energy
Focus Question: What mathematical relationship shows how mass and speed are used to determine KE?
Use a colored pencil to sketch this plot on the graph of GPE vs. Release Height.
Guidelines for the investigation:
The mass of each car is 1000kg.
The force of friction on the dry road is 10,000 N
The force of friction on the wet road is 3,000 N
To determine the KE of the vehicle use the equation:
KE = ½mv2
To determine the stopping distance use the equation:
Stopping Distance = (KE / stopping force)