Evidence Card A In the crash scene in Iceworld Revenge, Vehicle 1 slows somewhat before it collides with Vehicle 2. In her own test, Claire did not observe Vehicle 1 slowing down before the crash.

Evidence Card B In Iceworld Revenge, Vehicle 2 moves slowly toward the cliff after the collision, stopping just before it goes over the edge. In Claire’s test, Vehicle 2 went over the cliff at full speed.

Evidence Card C The surface (“road”) for the vehicles in Iceworld Revenge is clear and shiny. Claire’s film professor says the following materials might have been used. The friction of each substance is different. ice= low friction, plexiglass = medium friction, rubber= high friction

Evidence Card D In Iceworld Revenge, Vehicle 1 appears to move in the opposite direction after the crash, but it is offscreen so you can’t see how far or how fast it is moving. In Claire’s test, Vehicle 1 came to a stop after the collision.

Evidence Card E Claire’s film professor says these materials are commonly used for making miniature model vehicles. When painted, vehicles made from these materials all end up looking about the same. foam=low mass; plastic = medium mass; steel = high mass

The masses of the vehicles in Iceworld Revenge were different from each other, while in Claire’s test, the vehicles were the same mass.

A surface with more friction exerts a stronger force opposite the direction of motion, which would slow down that object even more

Friction is a force in the opposite direction of motion, which is what slows an object down.

Objects can only change their speed if they experience a force

This evidence shows that the objects experienced different changes in velocity from the collision.

It is possible to make the miniature cars look the same even if they are made out of materials with very different masses

Vehicle 2 stopped moving before it could fall off the cliff supports this piece.

A surface with more friction exerts a stronger force opposite the direction of motion, which would slow down that object even more

In a collision, both objects experience the same strength force, but in opposite directions.

Objects with less mass have a greater change in velocity from the same strength force

Evidence Card A In the crash scene in Iceworld Revenge, Vehicle 1 slows somewhat before it collides with Vehicle 2. In her own test, Claire did not observe Vehicle 1 slowing down before the crash.

Evidence Card B In Iceworld Revenge, Vehicle 2 moves slowly toward the cliff after the collision, stopping just before it goes over the edge. In Claire’s test, Vehicle 2 went over the cliff at full speed.

Evidence Card C The surface (“road”) for the vehicles in Iceworld Revenge is clear and shiny. Claire’s film professor says the following materials might have been used. The friction of each substance is different. ice= low friction, plexiglass = medium friction, rubber= high friction

Evidence Card D In Iceworld Revenge, Vehicle 1 appears to move in the opposite direction after the crash, but it is offscreen so you can’t see how far or how fast it is moving. In Claire’s test, Vehicle 1 came to a stop after the collision.

Evidence Card E Claire’s film professor says these materials are commonly used for making miniature model vehicles. When painted, vehicles made from these materials all end up looking about the same. foam=low mass; plastic = medium mass; steel = high mass

The friction of the surface was different in Iceworld Revenge than in Claire’s test. Vehicle 1 slowed down before it collided with Vehicle 2

Objects with less mass have a greater change in velocity from the same strength force

Objects can only change their speed if they experience a force

The masses of the vehicles in Iceworld Revenge were different from each other, while in Claire’s test, the vehicles were the same mass.

Friction is a force in the opposite direction of motion, which is what slows an object down.

Objects with less mass have a greater change in velocity from the same strength force

This evidence shows that the objects experienced different changes in velocity from the collision.

A surface with more friction exerts a stronger force opposite the direction of motion, which would slow down that object even more

Plexiglass looks like glass in a video but it's friction is higher than glass, allowing objects to slow down even more

In a collision, both objects experience the same strength force, but in opposite directions.

The surface that looked like ice in Iceworld Revenge could have been something other than ice and that had higher friction than ice, such as plexiglass