Newton's Law of Universal Gravitation

What is weight?

• The amount of matter an object has

• The measure of an object's inertia

• The gravitational force that attracts objects near Earth's surface

• 9.8 m/s²

Which property is directly proportional to the gravitational force between two particles?

• mass 1 only

• mass 2 only

• center-to-center distance between the two particles

• mass 1 and mass 2

If r is the center-to-center distance between m1 and m2, then the gravitational force between them is

• is directly proportional to r

• is directly proportional to r²

• is inversely proportional to r

• is inversely proportional to r²

How does F_g(2 on 1) compared with F_g (1 on 2)?

• They have the same magnitudes but opposite directions

• They have the same directions but opposite magnitudes

• They have the same magnitudes and directions

• They have opposite magnitudes and directions

Here mass 1 is clearly bigger than mass 2. Compare their forces.

• The magnitude of the force on mass 1 is bigger than on mass 2

• The magnitude of the force on mass 2 is bigger than on mass 1

• The magnitude of the force on both mass 1 and mass 2 are the same

• This question is sponsored by Milcu Deodorant Powder

Which of the following is the value of the Gravitational constant, G (to 3 sig figs)

• 6.67 x 10^-10 Nm²/kg²

• 6.67 x 10^-11 Nm²/kg²

• -9.8 m/s²

• 9.8 m/s²

If we double the mass of m₁ and triple the mass of m₂, while keeping r the same, what happens to their F_g?

• 5 times greater

• 6 times greater

• reduced by 1/5

• reduced by 1/6

If m₁ and m₂ have the same radius R, and r = 8R, then what happens to the gravitational force between them if the masses are kept constant, but they are brought closer so that they touch?

• reduced by 1/4

• reduced by 1/16

• 4 times greater

• 16 times greater

if m₁ = 2 kg, and m₂ = 1 kg, and r = 1 m, then what is F_g between them?

• G Newtons

• 1/2 G Newtons

• 2G Newtons

• 3G Newtons

• 4G Newtons

If m₁ = 1 kg, m₂ = 2 kg, and r = 2 m, then what is the magnitude of the initial acceleration of m₁?

• $2Gm_1$

• $4Gm_1$

• $\frac{G}{2m_1}$
  

• $\frac{G}{4m_1}$