Wheel and axle: wheels and axles can make objects move,turn,and lift. the wheel turns arounnd the rod and the rod is calle axle.They both move at the same time because
they are attached to each other and is moved by equle forces. The effort force is at the axle and the load is on the wheel.when you are turning a wheel you use effort force to move it.Since wheel is larger and axle is smaller the axle create a much larger turn of wheel. |
Pulley:pulley can make objects lift easier and by using effort force on wheels and ropes like on the picture.there 3 kinds of pulleys fixed pulley,movable pulley,and combined pulley. Make the object lighter because you are affording the force to the wheel and your weight is pulling on the object. If you have more wheels then the object will be more lighter. An example for a pulley is a crane. A cane is very simular to a pulley. They both have wheels that the rope is hanging from. Imagin you have to lift 1ton of gold and bring it to the bank in an hour with your hands. It would be so much hard so a pulley is very useful.
so if you use pulley you could lift objects lift up more easier by using less effort. Lever: Lever is very simular to a seasaw. A lever uses your weigt to lift other things. Like on this lever picture. Its like seasaw, but its used to lift objects to heavy to lift with your hands.there are 3 classes of lever. the 1st class is fulcrum
is between of load and effort. 2nd is fulcrum is in left and load is in middle then force is in right.3rd is fulcrum is in the left force is in the middle then load is in the right.sesaw is same example as 1 class. bottle opener is same example as 2nd class. |