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Name

Allowed Values

Comments

1.

Ball Size

S

Small

M

Medium

L

Large

Note that, in the underlying physical model behind the size we have the mass which is, in this case, proportional to ball’s squared radius (2D).

2.

Random number of balls

ON

Random number of balls will be used every time the application is launched

OFF

Use the underlying slider to select desired number of balls.

Note that, maximum number of ball varies depending on the selected Ball Size.

3.

Gravitation

ON

iPad’s embedded accelerometer provides information about acceleration in three independent directions X/Y/Z.

OFF

Accelerometer is ignored.

4.

Elastic collisions

ON

Balls are bouncing elastically without losing their kinetic energy.

OFF

Balls are not bouncing elastically. Each time the collision encounters there occurs also a loss of kinetic energy. The kinetic energy is not conserved.

Use underlying slider to select desired Coefficient of Restitution (bounciness)

5. 

Draw Vectors

ON

Vectors are drawn: Velocity: Red, Momentum: Green, Acceleration: Blue

Note that, Velocity and Momentum are sharing the same direction and sense.

OFF

No vectors are drawn.