SME
Grade 11 Science
Forces and Newton's laws: friction, inclines and tension
The main lesson, then each kind of problem it solves.
Forces and Newton's laws: friction, inclines and tension
Main lesson
A block sliding down an incline
Use this for “A 5 kg block slides down a 30° ramp with μₖ = 0.2. What is its acceleration?”
Pulling by a rope at an angle
Use this for “A 10 kg sled is pulled with 50 N by a rope 30° above level; μₖ = 0.1. Find the normal force and the acceleration.”
Hanging in an elevator
Use this for “A 3 kg lamp hangs from the ceiling of an elevator speeding up at 2 m/s² going up. What is the tension in its cord?”
Adding two forces
Use this for “Two dogs pull a 25 kg sled: 60 N east and 80 N north. What is the net force, which way, and the acceleration?”
Is the net force zero?
Use this for “A cork floats still on water. What force balances its weight?” and other questions about balanced forces.