How much force (in kg) do we need to use to lift the 120 kg weight?

To calculate the force required to lift an object, we use the formula:

Force = mass x gravity

Where:

• The mass is 120 kg
• Gravity is approximately 9.8 m/s² on Earth

So, the calculation is:

Force = 120 kg x 9.8 m/s² = 1176 Newtons

However, the question asks for the force in kilograms. This is a bit of a misunderstanding because force is not measured in kilograms. Kilograms are a unit of mass, not force. The correct unit for force is the Newton (N).

So, the force required to lift a 120 kg weight is 1176 Newtons. If you want to convert this force to "kilograms-force", which is a non-standard unit but sometimes used, you can divide the force in Newtons by the acceleration due to gravity (9.8 m/s²).

1176 N / 9.8 m/s² = 120 kgf

So, you would need a force of approximately 120 kgf to lift the 120 kg weight.