You might remember the meaning of the character 势 with this easy mnemonic:
That umbrella (扌) is in no condition to slash (丿) his tires. You've tried a second (乙) time and its only dotted (丶) the surface. You've done everything in your power (力) to wreck his car.
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.