Which of the following causes the efficiency of a machine to be less than 100%? 1.work 2.power 3.mechanical advantage 4.friction

How are momentum and impulse related? impulse is a whim to do something, while momentum keeps it going impulse is another name fore instantaneous momentum the impulse acting on and object is equal to the change of momentum it causes. the impulse that acts on and object is the momentum that results.

When you drop a pebble from height a it reaches the ground with speed v if there is no air resistance. from what height should you drop it so it will reach the ground with three times the speed? (a) 9m (b) 3m (c) 6m (d) 18m

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge