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The upward force needed to lift the mass is slightly larger then the downward force of gravity. The acceleration of an object in free fall is 9.8 m/s²
Gravitational force (N) = mass (kg) X gravitational acceleration (m/s²)
Force= 25kg X 9.8m/s²
Force = 245N
Wiki User
∙ 13y ago
Wiki User
∙ 15y agoThe force is 0.40 x 9.81 Newtons. (400 grams = 0.40 Kg, gravitational constant = 9.81 m/sec2). What you are after however is the work done in lifting the weight by 20 cm (which is 0.02m), and this is force x distance, in this case 0.40 x 9.81 x 0.02 joules = 0.0785 joules.
Remember, force is not the same as work (or energy). Work is force x distance, and 1 Joule = 1 Newton x 1 meter.
Wiki User
∙ 12y agomore force is required to lift the weight than the weight itself.
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