Physics & Mechanics
CourseLesson 1 of 1
Engineering Mechanics & Dynamics
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Key formulas
Work Done by Force
W=F·d·cos(θ)
Work equals force times displacement times cosine of angle.
Incline Acceleration (No Friction)
a=g·sin(θ)
Component of gravity along a frictionless incline.
Part 1 of 1
1. Inclined Planes & Friction
For a mass m on an incline of angle θ:
- Parallel force component: F_parallel = m · g · sin(θ)
- Normal force: N = m · g · cos(θ)
- Acceleration (no friction): a = g · sin(θ)
Worked example
A 4 kg block slides down a 30° incline. With g = 10 m/s²: a = 10 × sin(30°) = 10 × 0.5 = 5 m/s².
1.On a frictionless incline, a heavier object accelerates faster than a lighter object.
Exam strategy
If you can explain why the wrong answers are wrong, you know the topic. Remembering the right one only gets you halfway.
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