Quite frankly, Grade 11 Physics can be tough, because it involves using lots of formula, which students are expected to know beforehand. Most of the concepts will be very new for many students. In most cases, problem-solving does not follow concrete steps, as in math. So students will need to know all the formulas, as well as how to manipulate different equations to achieve their desired result.
Physics questions are traditionally full of word problems, and that's another area of challenge to most students, because they'll need to understand the questions, interpret them, then extract the given variables and variations. But with practice, even this can be mastered.
Grade 11 physics is a pre-requisite for Grade 12 Physics and an important course for students who wish to pursue engineering or science in university.