How much force needed to partialy lift object?

  • Thread starter JamesGreen
  • Start date
  • Tags
    Force Lift
In summary, the formula for calculating the force needed to lift an object up to a certain distance without fully lifting it would be half the weight if the weight is uniformly distributed along the length of the object. This can be proven using moments of force and a diagram can be provided for clarification.
  • #1
JamesGreen
2
0
Hi,

Imagine you have an object where the weight is equally divided. What would be the formula to calculate the force needed to lift the object up to a distance without lifting it up completely. For example, a push-up, your feet keep touching the ground but you push your self up. How would one calculate that? If the mass, length, height and standard gravity are known?

Thanks in advance
 
Physics news on Phys.org
  • #2
Welcome to the Forum.
If the weight is uniformly distributed along the length of the mass, like a metal rod, for example; then the force you would need to apply to the one end, the other staying on the ground, would be exactly half the weight.
Proof using moments of force about the support point on the ground gives mg x L/2 = F x L where L is the length of the rod.
Diagram can be provided if you want one!
 
  • #3
Thank you!
 
Last edited:

1. How is force calculated?

Force is calculated by multiplying mass by acceleration. The formula for force is F=ma, where F is force, m is mass, and a is acceleration.

2. What is the difference between mass and weight?

Mass is the amount of matter an object contains, while weight is the measure of the force of gravity on an object. Mass is measured in kilograms (kg) and weight is measured in newtons (N).

3. How much force is needed to partially lift an object?

The amount of force needed to partially lift an object depends on the mass of the object and the desired height it needs to be lifted to. The formula F=mg can be used, where F is the force, m is the mass of the object, and g is the acceleration due to gravity (9.8 m/s²).

4. How can I determine the force needed to partially lift an object?

To determine the force needed to partially lift an object, you will need to know the mass of the object and the desired height it needs to be lifted to. You can then use the formula F=mg to calculate the force needed. It is also important to consider any other forces acting on the object, such as friction or air resistance, which may affect the amount of force needed.

5. Is there a minimum amount of force needed to partially lift an object?

Yes, there is a minimum amount of force needed to partially lift an object. This is known as the minimum force of static friction and it is the amount of force needed to overcome the force of friction between the object and the surface it is resting on. If the applied force is less than the minimum force of static friction, the object will not move.

Similar threads

I Force Required for Gas Struts on 1972 VW T2 Danbury Pop top campervan?
    • Mechanics
Replies
9
Views
2K
B What forces are required to tumble a block?
    • Mechanics
Replies
16
Views
525
I What is the minimum force required to lift an object?
    • Classical Physics
4
Replies
128
Views
6K
I Understanding the physics of a bosun's chair and mechanical advantage
    • Mechanics
Replies
6
Views
2K
Fulcrum, balance point and scissor lift force
    • Mechanics
Replies
2
Views
2K
B Newton's 3rd Law interactions with 2nd and 1st Law Partners
    • Mechanics
Replies
8
Views
317
Simple problem for experts.... (work done lifting weights at the Gym)
    • Mechanics
Replies
7
Views
1K
Flow rate needed to lift object inside a vertical pipe
    • Mechanical Engineering
Replies
4
Views
815
Lifting an object through water (force needed)
    • Mechanics
Replies
17
Views
7K
How to work out Joules needed to perform work
    • Mechanics
Replies
16
Views
5K

Hot Threads

Recent Insights

Back
Top