How to Measure the Force of an Object Using a Spring Scale

In this guide, we will explore how to accurately measure the force exerted by an object using a spring scale. This simple yet effective method can be applied in various scientific and educational settings, making it a valuable skill to develop.
By Jamie

Measuring Force with a Spring Scale

What is a Spring Scale?

A spring scale is a tool that measures the force acting on an object, typically in units of newtons (N) or pounds (lbs). It consists of a spring fixed at one end, with a hook or platform attached to the other. As the object is applied to the scale, the spring stretches and the force is indicated on a calibrated scale.

Example 1: Measuring the Weight of an Object

Materials Needed:

  • Spring scale (0-10 N range)
  • Small weight (e.g., a bag of rice)

Procedure:

  1. Zero the Scale: Before starting, ensure that the spring scale is calibrated to zero. Hang the scale without any weight and adjust it until the pointer is at zero.
  2. Attach the Weight: Hang the bag of rice from the hook of the spring scale.
  3. Read the Measurement: Observe the scale as the bag hangs freely. The pointer will indicate the force due to gravity acting on the weight. For example, if the scale reads 5 N, this means the weight of the bag is 5 N.

Example 2: Measuring the Force of a Pull

Materials Needed:

  • Spring scale (0-5 N range)
  • A small cart or toy vehicle

Procedure:

  1. Set Up the Experiment: Place the cart on a flat surface, ensuring it can move freely.
  2. Attach the Spring Scale: Connect the spring scale to the cart’s handle or a secure point.
  3. Pull the Cart: Slowly pull the cart with a steady force. Observe the reading on the spring scale as you pull.
  4. Record the Measurement: For instance, if at a steady pull, the scale reads 2 N, you have exerted a force of 2 N to move the cart.

Example 3: Measuring Frictional Force

Materials Needed:

  • Spring scale (0-10 N range)
  • A block of wood
  • A flat surface (like a table)

Procedure:

  1. Place the Block: Position the block on the flat surface.
  2. Attach the Spring Scale: Hook the spring scale to the block.
  3. Pull the Block: Gradually pull the block until it starts moving. Take note of the force reading just before it begins to slide. This measurement indicates the static frictional force.
  4. Record the Measurement: If the scale shows 3 N just before the block moves, the static friction force is 3 N.

Conclusion

Using a spring scale is a straightforward and effective way to measure the force of an object. Whether determining weight, pulling force, or frictional force, following these methods will help you gain practical experience in physics measurement techniques.