How do I calculate the force of gravity on a 1-kg mass at Earth's surface?

[LoveKnowledge]

1. Calculate the force of gravity on a 1-kg mass at Earth's surface. The mass of Earth is 6.0 x 10^24 kg, and its radius is 6.4 x 10^6 m.



2. F=G m1m2/d²



3. I am confused on how to solve this problem. I know the mass of Earth and its radius (the numbers needed to plug into the equation) but I am confused as I need to solve for the Universal Gravitational Contant as well? I am just confused with the different numbers and figures involved with this problem and would appreciate help if possible...thanks!

 

[Bill Foster]

gravitational constant = 6.67300 × 10^-11 m^3 kg^-1 s^-2

 

[LoveKnowledge]

How do I use the Gravitational Constant to solve this problem? For some reason it is confusing me very much...do I solve the problem in entire equational form or do I actually solve for the equations?

 

[Doc Al]

All you need to do is plug the numbers into the formula (Newton's law of gravity) and use your calculator.

 

[LoveKnowledge]

K. This also includes the known for G (universal gravitational constant) correct? THx again...just confused on this for some reason

 

[Doc Al]

K. This also includes the known for G (universal gravitational constant) correct?

Sure. The formula includes the constant G, m1, m2, and d (which is the radius of the earth). You have all those values. Time to calculate!