What is the sleeve called that is used to give the axle a smooth surface to rub against.wood dowelbushingbearingA car built for distance requires a ____________ lever arm.shortlongstableIn general the longer the length of the plan the _________ force is needed to move the object.morelessEnergy that is stored is called:stable energykinetic energypotential energyWho invented the spring loaded mouse trap?James Henry AtkinsonJames spellingThomas WardMost cutting devices use the principle of:the inclined planethe wheelthe leverThe balance point of an object is called the center of ______________.balancemasstensionA compressed spring of a mouse trap car is an example of ____________ energy.potential kineticstableWhat force opposes motion and has a great effect on a mouse trap cars performance.frictiongravitybearingsWhat is the approximate speed of a mouse trap hammer?50 mph70 mph85 mph Loading...