Thames & Kosmos Gumball Machine Maker: Super Stunts & Tricks handleiding

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WHAT’S HAPPENING

The variable-slope track helps you perform

experiments on the force of gravity. The track can

be set at different slopes, or degrees of steepness.

At a less-steep setting, gumballs will roll

down the track slower than at a more-steep

setting. This is because the slope prevents the full

force of gravity from pulling the gumball down

the track. The steeper the track, the more gravity

can pull the gumball along the direction of the

track. The flatter the track, the more gravity will

try to pull the gumball into the track itself, where

it cannot go. This variable-slope track is a simple

machine called an inclined plane.

At its lowest setting, gumballs actually get

caught in the track because gravity pulls them

away from the open end of the track.

Low slope

High slope

Experiment 3: Inclined plane

HERE’S HOW

Attach the variable-slope track to the

tower. Connect it to the tower with a

straight pivot post and the variable-slope

track holder. Attach the hole of the track

holder to a peg on the same level as the

upper hole in the straight pivot post. This

results in a track with a high slope.

Roll a gumball down the track and catch it

at the end. Observe what happens.

Change the location of the track holder so

that its hole is on the same level as the

lower hole in the straight pivot post. This

changes the slope of the track.

Roll a gumball down the track again.

Observe what happens this time. Increase

the slope of the track until the gumball rolls

out of the track again.

Variable-

slope track

Straight

pivot post

Variable-

slope track

holder

Experiment 4: Friction

HERE’S HOW

Attach the friction track to the tower at any

location.

Place a gumball at the top of the track. Have

your other hand ready to catch it at the end

of the track. Let it go. What do you observe?

Friction

track

WHAT’S HAPPENING

The friction track has raised bumps on it. These

cause the gumball to slow down as it travels

down the track. They increase the friction

between the track and the gumball. Friction is

the force resisting the motion of objects sliding

past each other. As the gumball rolls down the

track, it is releasing its potential energy as always.

It makes more noise than on a smooth track. The

increased friction is causing energy to be lost to

heat and sound. There is less energy to convert into

kinetic energy, so the gumball moves slower.

Gumball Machine Maker

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