The two difficulty levels differ only in terms of the number of contrasting collisions that must be analyzed. They can be summarized as follows:

**Master Difficulty Level**: Question Groups 1-4**Wizard Difficulty Level**: Question Groups 1-8

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Compare the collision between two balls and the floor.

The collision time is the same for each case.

Which variable is different for these two cases?

Which case involves the greatest momentum change? … the greatest impulse? … the greatest force?

Compare the collision between two balls and the floor.

The collision time is the same for each case.

Which variable is different for these two cases?

Which case involves the greatest momentum change? … the greatest impulse? … the greatest force?

Compare the collision between two baseballs and a catcher's mitt.

Which variable is different for these two cases?

Which case involves the greatest momentum change? … the greatest impulse? … the greatest force?

Compare the collision between two baseballs and a catcher's mitt.

Which variable is different for these two cases?

Which case involves the greatest momentum change? … the greatest impulse? … the greatest force?

Compare these two collisions of a PE student with a wall.

Which variable is different for these two cases?

Which case involves the greatest momentum change? … the greatest impulse? … the greatest force?

Compare these two collisions of a PE student with a wall.

Which variable is different for these two cases?

Which case involves the greatest momentum change? … the greatest impulse? … the greatest force?

Compare the catching of two different water balloons.

The collision time is the same for each case.

Which variable is different for these two cases?

Which case involves the greatest momentum change? … the greatest impulse? … the greatest force?

Compare the catching of two different water balloons.

The collision time is the same for each case.

Which variable is different for these two cases?

Which case involves the greatest momentum change? … the greatest impulse? … the greatest force?

Compare these two collisions of a driver in a car.

Which variable is different for these two cases?

Which case involves the greatest momentum change? … the greatest impulse? … the greatest force?

Compare these two collisions of a driver in a car.

Which variable is different for these two cases?

Which case involves the greatest momentum change? … the greatest impulse? … the greatest force?

Compare these two collisions of a car during a crash test.

Which variable is different for these two cases?

Which case involves the greatest momentum change? … the greatest impulse? … the greatest force?

The collision time is the same for each case.

Compare these two collisions of a car during a crash test.

Which variable is different for these two cases?

Which case involves the greatest momentum change? … the greatest impulse? … the greatest force?

The collision time is the same for each case.

Compare the collision of a gymnast with the floor using two different landing strategies.

Which variable is different for these two cases?

Which case involves the greatest momentum change? … the greatest impulse? … the greatest force?

Compare the collision of a gymnast with the floor using two different landing strategies.

Which variable is different for these two cases?

Which case involves the greatest momentum change? … the greatest impulse? … the greatest force?

Compare these two collisions of an egg with the floor.

The collision time is the same for each case.

Which variable is different for these two cases?

Which case involves the greatest momentum change? … the greatest impulse? … the greatest force?

Compare these two collisions of an egg with the floor.

The collision time is the same for each case.

Which variable is different for these two cases?

Which case involves the greatest momentum change? … the greatest impulse? … the greatest force?