When the moon is directly between the sun and earth, a tide will occur along a shoreline that is facing the moon.

How do we measure or think of speed in the united states?

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

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^.