Elastic and Inelastic Collisions

Car Collisions and Crash Tests

Safety Barriers

Elastic and Inelastic Collisions

This is what happens to aluminum when hit by a 1/2 oz (14g) piece of plastic going 15,000 mph (24,000 km/h). Was this an elastic collision, an inelastic collision, or a perfectly inelastic collision?

Newtons Cradle in Slow Motion | Make Science Fun (1:29)

Watch as the teacher demonstrates the classroom Newton’s cradle.

    • When the balls collide, is it an elastic collision, an inelastic collision, or a perfectly inelastic collision?
    • In a ideal Newton’s cradle, would the collisions be elastic collisions, inelastic collisions, or a perfectly inelastic collisions?

Golf Ball into Steel Plate at 150 mph and 70,000 fps (0:29)

Kid vs. Rotating Arm

blind school goes to the county fair 

Car Collisions and Crash Tests

Two cars, both the same size and each traveling at 50 miles per hour (mph), crash into each other head-on. Is this the equivalent of running into a wall at 50 mph, or 100 mph? Use the concepts of impulse and momentum to justify your answer.

How much more kinetic energy does a car traveling at 100 mph have compared to the same car traveling at 50 mph?

Mythbusters – Scale Model of Car vs. Car and Car vs. Wall (7:41)

MythBusters – Car vs. Wall (9:54 – start at 7:06)

MythBusters – Car vs. Car (3:32)

As you watch the following video, how does the newer car help protect the passenger compared to the old car?

2009 Chevy Malibu vs 1959 Bel Air Crash Test | Consumer Reports (1:57)

Euro NCAP 20 years of crash testing – Honda Jazz vs Rover 100 Comparison (2:03)

Safety Barriers

Bollards are used to protect against ramming by a car. They are used in government buildings, army bases, gas stations and many other places.

Safety Barrier – Bollard (2:22 – start at 0:50)

Safety Barrier – n-Shaped (2:09)

Safety Barrier – Wedge (1:24)

Big Sandy Impact Attenuator Sand Barrel – TrafFix Devices (5:56 – watch first 0:40 only)

CrashGard® Sand Barrel System (0:46 – watch 0:33 to 0:40)