1. MARSHMALLOW CATAPULTS

2. “The Engineering Process”
in designing and constructing. It includes the following steps:
1. Brainstorm
2. Design
3. Build/prototype (a prototype is a model of
the first design)
4. Test
5. Redesign

3. The Catapult: Step-by-Step
Projectile placed in the cradle at the end of the catapult's arm
2. The arm is pulled back, creating tension on an elastic restraint
This built up potential energy is released and does work on the arm and therefore on the projectile
The projectile gains kinetic energy as the arm accelerates forward
The arm is brought to an abrupt halt
The projectile retrains kinetic energy and launches from the cradle

4. Kinetic Energy Potential Energy
Vocabulary
Potential Energy - stored energy--energy ready to go
Ex: A car at the top of a hill
Kinetic Energy – energy that is released, in motion
Ex: A car rolling down a hill
Trajectory - the path that a thrown or
launched projectile will take under the
action of gravity, not taking into account
all other forces, such as friction from
air resistance, without propulsion.
Projectile - A fired, thrown, or
otherwise propelled object,
having no capacity for
self-propulsion.
Range – how far a projectile will
travel
trajectory
Kinetic Energy
energy created by
movement of the arm
Projectile
Potential Energy
Stored in the rubber
band or string
Abrupt halt
cradle
tension