Question | Answer |
door on hinges | lever |
stairs | inclined plane |
light bulb | screw |
crane | pulley |
door knob | wheel and axle |
push pin | wedge |
lever | a rigid bar board that is free to move around a fixed point called a fulcrum. The fulcrum may be placed at different locations along the bar. |
pulley | have a grooved wheel with a rope running along the groove. Pulleys can change the amount and/or the direction of the effort force. |
inclined plane | reduce the amount of force required to lift an object |
wheel and axle | consists of two circular objects: a central shaft called an axle, inserted through the middle of a wheel |
complex/compound machines | conssist of two or more simple machines |
levers | rake door catapult arms and legs seesaw wheelbarrow pencil |
inclined plane | sloped driveway escalator stair ramp ladder bleachers roof |
pulleys | crain flag pole elevator blinds tow truck fishing pole |
wheel and axle | wheel feriis wheel screwdriver propeller door knob yo-yo |
screw | light blub screw jar lid cord screw spiral staircase |
wedge | ziper axe teeth chisel fingernail saw knife |
when a force produces motion in the direction of the force | work |
macine made of two or more simple machines | compound machine |
a flat sloped surface | inclined plane |
an inclined plane that moves | wedge |
a machine with only one movement | simple machine |
an inclined plane wrapped around a cylinder | screw |
two circular objects of a different sizes that are attached in such a way that they rotate together | wheel and axle |
any rigid rod or plank that pivots about a point | lever |
a grooved wheel with a rope or chain wrapped around it | pulley |
someone sitting on a cushion on the floor | none |
the cushion is picked up and put on the couch | work |
the cushion is put back on the floor | work |
a baseball is hit into the bleachers | work |
you lift your arms above your head | work |
you study two hours for a test | none |
a little girl on a swing is pushed by her father | work |