Swing down too hard and the robot will move up. You can see this with the Blacksmith (and other hammer bots). In order to make the total bot momentum zero, the rest of the robot (the body) has to have an upward momentum. It is powered by the large silver motor (Terrain Trekker I Think). Once the hammer falls, the mass of the hammer head has a downward momentum. This is a Knex battlebot that is around 1.5ft long and 1ft high. So if you consider a robot to have a body and a hammer, the total momentum should stay at zero as it sits on the floor. Momentum is the product of an object's mass and velocity and it doesn't change unless there is an external force acting on this object. In order to increase the energy of the impact, a bot can increase the mass of the hammer to compensate for the lower speed during the swing (compared to a spinner).īut a large mass hammer introduces a new problem-momentum. A swinging hammer can only gain energy during the swing (which is typically a short time). But how does a hammer compare to a vertical spinner? The one clear disadvantage is the energy. These seem to be popular-I suppose because hammers just look cool. Yes, Blacksmith is a robot with a hammer. Take another look at the battle between Minotaur and Blacksmith. Maybe I will come back to this in a later post. Honestly, the physics of these tilt moves can be a little complicated. This can lead to some weird cases where the robot actually tilts up on its side as it turns. In order to turn the direction of the robot, you need extra torque so that you can change the axis of rotation for the spinning disk. You can really see this with vertical spinning bots. It just feels weird since we are used to this angular momentum thing.Ī robot with a spinning disk also has angular momentum. This means that it takes more torque to flip it over. A spinning fidget spinner has more angular momentum than a non-rotating one. Perhaps this is one reason it's fun to play with. One place you might have seen its effects is with the fidget spinner (that finger-based spinning toy). Yes, it's true-most people don't have much everyday experience with angular momentum. If you want to change the axis along which an object rotates, you need to apply a torque (a twisting force). What the heck is angular momentum? Here is a longer explanation-but for now I will just say that angular momentum is a property associated with rotating objects.
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