O_TEXTBLOCK_TEXT When the first droid pushes the crate, it applies enough <HL Topic=Force.tpc>FORCE</HL> to overcome the crate's inertia, causing it to move. The second droid overcomes the moving crate's inertia by applying enough <HL Topic=Force.tpc>FORCE</HL> to stop it. When the second droid pushes the crate back to the first droid, it applies enough <HL Topic=Force.tpc>FORCE</HL> to overcome both the crate's inertia and the first droid's inertia, causing each of them to move.
E_QUEST1 How does inertia affect making a bowl on a potter's wheel?
E_QUEST2 Why do objects in a car sometimes slide off the seat when the driver stops quickly?
E_QUEST3 Which has more inertia: a train moving 100 kilometers per hour, or a car moving 100 kilometers per hour?
D_TEXTBLOCK_TEXT Inertia is the tendency of an object to stay at rest if it is already at rest, and to stay in <HL Topic=Motion.tpc>MOTION</HL> if it is in <HL Topic=Motion.tpc>MOTION</HL>. An outside <HL Topic=Force.tpc>FORCE</HL> is needed to overcome the state of <HL Topic=Motion.tpc>MOTION</HL> of an object. When an object has a small <HL Topic=Mass.tpc>MASS</HL>, less <HL Topic=Force.tpc>FORCE</HL> is needed to overcome its inertia.