1. when you have different masses for each sphere, how does the force that the larger mass sphere exerts on the smaller mass sphere exerts on the larger mass sphere?
2. what happens to the force between the two spheres of the same mass when the distance between the mass sphere is halved?
3. the force of attraction between 2 objects is called gravity. what do you think about an object, like your notebook, pull towards you? explain your reasoning.

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.