Question

topic 1 lever and work assignment
introduction
there are three classes of levers. in a class 1 lever, the fulcrum is between the effort and the load. in a class 2 lever, the resistance is between the effort and the fulcrum. a class 3 lever is arranged so that the effort is between the load and the fulcrum. to use a class 3 lever, you must exert a greater force on the lever than the lever exerts on the load. the advantage is that the load can be moved very quickly.
what to do
identify the class of each lever below. fill in the blanks below the image
1.

__________
2.

__________
3.

__________
4.

__________
5.

__________
6.

__________
7.

__________
8.

__________
9.

__________
fill in here!!!!
1: __ 2: 3: __
4: __ 5: 6: __
7: __ 8: 9: __

Explanation:

1. Item 1 (Hook): Effort is applied at the curved end, load is at the straight tip, fulcrum is where the hook rests. Load is between fulcrum and effort → Class 2.
2. Item 2 (Shovel): Effort is at the handle, load is in the blade, fulcrum is at the hand supporting the shovel shaft. Effort is between fulcrum and load → Class 3.
3. Item 3 (Punch pliers): Effort is at the handles, load is at the cutting jaws, fulcrum is the pivot. Load is between fulcrum and effort → Class 2.
4. Item 4 (Mop): Effort is at the top handle, load is at the mop head, fulcrum is at the hand holding the lower shaft. Effort is between fulcrum and load → Class 3.
5. Item 5 (Pliers): Effort is at the handles, load is at the gripping jaws, fulcrum is the pivot. Load is between fulcrum and effort → Class 2.
6. Item 6 (Wheelbarrow): Effort is at the handles, load is in the bucket, fulcrum is the wheel. Load is between fulcrum and effort → Class 2.
7. Item 7 (Scissors): Effort is at the finger loops, load is at the cutting blades, fulcrum is the pivot. Fulcrum is between effort and load → Class 1.
8. Item 8 (Tongs): Effort is at the handle ends, load is at the gripping ends, fulcrum is the pivot. Effort is between fulcrum and load → Class 3.
9. Item 9 (Fishing rod): Effort is at the hand holding the rod, load is at the hook, fulcrum is at the hand supporting the base. Effort is between fulcrum and load → Class 3.

Answer:

1: Class 2
2: Class 3
3: Class 2
4: Class 3
5: Class 2
6: Class 2
7: Class 1
8: Class 3
9: Class 3