Problem Description:
The task involves identifying the
fulcrum in each of the three different types of levers shown in the image. A lever is a simple machine consisting of a board or rigid bar that pivots around a fixed point called the
fulcrum. The position of the fulcrum affects how easily a weight can be lifted.
Solution Explanation:
#### Step 1: Understanding the Lever and Fulcrum
- A
lever is a rigid bar that rotates around a fixed point, called the
fulcrum.
- The fulcrum is the pivot point where the lever turns.
- Levers are classified into three types based on the relative positions of the fulcrum, effort (force applied), and load (weight to be moved):
1.
Class 1 Lever: Fulcrum is between the effort and the load.
2.
Class 2 Lever: Load is between the fulcrum and the effort.
3.
Class 3 Lever: Effort is between the fulcrum and the load.
#### Step 2: Identifying the Fulcrum in Each Image
##### Image 1:
- This is a seesaw-like setup.
- The person is applying force on one end, and the other end lifts a weight.
- The
fulcrum is the point where the board rests on the ground, allowing it to pivot.
-
Fulcrum Location: The middle point where the board touches the ground.
##### Image 2:
- This is a wheelbarrow.
- The person is pushing down on the handles, lifting the load at the front.
- The
fulcrum is the wheel, which acts as the pivot point for the entire structure.
-
Fulcrum Location: The wheel at the bottom of the wheelbarrow.
##### Image 3:
- This is a pair of pliers.
- The person is applying force with their hand, and the pliers' jaws are gripping an object.
- The
fulcrum is the hinge where the two parts of the pliers meet.
-
Fulcrum Location: The hinge connecting the two arms of the pliers.
#### Step 3: Summarizing the Results
-
Image 1: Fulcrum is the middle point where the board touches the ground.
-
Image 2: Fulcrum is the wheel at the bottom of the wheelbarrow.
-
Image 3: Fulcrum is the hinge connecting the two arms of the pliers.
Final Answer:
$$
\boxed{\text{Image 1: Middle point of the board, Image 2: Wheel, Image 3: Hinge}}
$$
Parent Tip: Review the logic above to help your child master the concept of levers worksheet.
