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MESA Day 2013 Mousetrap Car 6 th -8 th Grade - Distance 9 th -12 th Grade - Accuracy.

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Presentation on theme: "MESA Day 2013 Mousetrap Car 6 th -8 th Grade - Distance 9 th -12 th Grade - Accuracy."— Presentation transcript:

1 MESA Day 2013 Mousetrap Car 6 th -8 th Grade - Distance 9 th -12 th Grade - Accuracy

2 Students will build a vehicle solely powered by a standard mousetrap to travel the longest distance on a specified track (MS) or stop the closest to a specified target (HS). Materials: 1 standard mousetrap All other materials are legal NO KITS! Students will build a vehicle solely powered by a standard mousetrap to travel the longest distance on a specified track (MS) or stop the closest to a specified target (HS). Materials: 1 standard mousetrap All other materials are legal NO KITS!

3 READ RULES AT LEAST TWICE!! Mousetrap is ONLY source of energy Dont tamper with mousetrap: No paint No decoration Alteration allowed ONLY for attaching mousetrap to chassis Spring may not be altered READ RULES AT LEAST TWICE!! Mousetrap is ONLY source of energy Dont tamper with mousetrap: No paint No decoration Alteration allowed ONLY for attaching mousetrap to chassis Spring may not be altered READ RULES AT LEAST TWICE!!

4 Energy: Energy: Its what moves the car. Potential: energy stored in a system (mousetrap spring) Elastic & Gravitational Kinetic: energy of motion Potential Kinetic Inertia: Inertia: The resistance an object has to changing its state of motion. Rotational Inertia: Rotational Inertia: The resistance an object has to changing its state of rotation. Friction: Friction: A force that opposes the direction of motion. Static: caused from two surfaces pressing together. Fluid: caused from liquids or gases. In air, this is known as drag. Torque: Torque: The force required to rotate an object. Power: Power: The rate at which energy is released or transformed in a system. Energy: Energy: Its what moves the car. Potential: energy stored in a system (mousetrap spring) Elastic & Gravitational Kinetic: energy of motion Potential Kinetic Inertia: Inertia: The resistance an object has to changing its state of motion. Rotational Inertia: Rotational Inertia: The resistance an object has to changing its state of rotation. Friction: Friction: A force that opposes the direction of motion. Static: caused from two surfaces pressing together. Fluid: caused from liquids or gases. In air, this is known as drag. Torque: Torque: The force required to rotate an object. Power: Power: The rate at which energy is released or transformed in a system.

5 The Engine: Spring + Lever Arm Energy from spring is transferred to car via the lever arm Lever arm provides torque required to turn axles Energy from spring is transferred to car via the lever arm Lever arm provides torque required to turn axles Length of lever arm affects power output Shorter arm = faster output Longer arm = slower output

6 Wheels & Axles # of wheels : 3 or 4 Wheel radius The greater the radius, the greater the torque required to rotate the axle Wheel grip (traction) Power output must match wheel grip to avoid spinning Avoid wasting energy Ratio of wheel-to-axle Larger ratio good for distance, but not necessarily for accuracy Friction Reduce friction between wheels and surface Also between axle and chassis Alignment # of wheels : 3 or 4 Wheel radius The greater the radius, the greater the torque required to rotate the axle Wheel grip (traction) Power output must match wheel grip to avoid spinning Avoid wasting energy Ratio of wheel-to-axle Larger ratio good for distance, but not necessarily for accuracy Friction Reduce friction between wheels and surface Also between axle and chassis Alignment

7 Wheels & Axles

8 The body of the car Balsawood, plastic, other lightweight materials Mass The heavier the car, the greater the friction force with the surface More force required to actually move the car Long chassis vs. Short chassis Narrow vs Wide Aerodynamics (negligible) The body of the car Balsawood, plastic, other lightweight materials Mass The heavier the car, the greater the friction force with the surface More force required to actually move the car Long chassis vs. Short chassis Narrow vs Wide Aerodynamics (negligible)

9 Fast vs Slow Accuracy: Can be fast or slow Length of lever arm Wheel and axle size Braking mechanism? quick power output Accuracy: Can be fast or slow Length of lever arm Wheel and axle size Braking mechanism? quick power output Slow: Build a car that will accelerate slowly over the entire distance that it travels. Less coasting. longer lever arm larger wheel radius slow power output Slow: Build a car that will accelerate slowly over the entire distance that it travels. Less coasting. longer lever arm larger wheel radius slow power output Fast: Build a car that will accelerate quickly and coast as far as possible shorter lever arm smaller wheel radius quick power output Fast: Build a car that will accelerate quickly and coast as far as possible shorter lever arm smaller wheel radius quick power output

10 Research, research, research! Experimentation is the key Set a working timeline READ THE RULES….twice….again!! HAVE FUN!!!: Its not the end of the world.

11 Research, research, research! Experimentation is the key Set a working timeline READ THE RULES….twice….again!! HAVE FUN!!!: Its not the end of the world.

12 Marvin Maldonado Director, SDSU MESA


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