Thames & Kosmos Catapult Engineering handleiding

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Thames & Kosmos

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Handleiding

— Rubriktitel BlindtextLorem Ipsum

Catapult Engineering

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As you learned in Experiment 1, when you stretch

the rubber band tighter you add more potential

energy to the rubber band. That means more

potential energy to launch the bolt. This energy is

then changed to kinetic energy, the energy

of motion, which can be calculated by the equation:

KE =

where m is the mass and v is the velocity. Since the

mass of the bolt stays constant, the only thing that is

changing when you stretch the rubber band more is

the velocity. This is why the bolt travels faster when

you tighten the rubber band.

EXPERIMENT 2

How can you vary the velocity of the

projectile?

Here’s how:

1. Stand at the mark you set up in

the preparation steps.

2. Load a bolt into the crossbow by

lining up the bolt with the plus-

sign-shaped hole. Make sure

both strands of the large rubber

band are pushed inward by the

bolt. Push the bolt inward until it

clicks into place.

3. Hold the crossbow horizontally.

Release the bolt towards the

target by pulling the trigger.

Mark where the bolt lands using

a piece of tape.

4. Now stretch the rubber band

around the other set of pulley

wheels. What do you notice

about the rubber band?

5. Hold the crossbow at the same

height and distance from the

target when shooting the bolt.

Measure and compare the

distances the bolts

traveled.

>> What happens when you

pull the trigger?

>> What do you notice about

the speed of the bolts?

>> Try looping the rubber

band around the pulley

wheel to make it even

tighter. How far does the

bolt travel?

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