Free Body Diagram Interactive
A football is moving upward and rightward towards the peak of its trajectory. Ignore air resistance.
Down- Gravity
A football, originally kicked at an 40-degree angle to the horizontal, is at the peak of its trajectory. Ignore air resistance.
Down- Gravity
A downward-moving skydiver who has just opened the parachute is slowing down. (Diagram the forces on the skydiver/parachute combination.)
Up - Air Resistance + Extended Down- Gravity
A downward-moving skydiver is falling with a constant speed.
Up- Air Resistance Down- Gravity
A rightward-moving car is skidding to a stop across a level roadway with locked wheels. Ignore air resistance.
Up- Normal Left- Friction Down- Gravity
A rightward force is applied to a crate to push it across the floor at a constant speed. Ignore air resistance.
Up- Normal Left- Friction Down- Gravity Right- Applied
A softball player does a head-first dive and is sliding to the right across the infield dirt. Ignore air resistance.
Up- Normal Left- Friction Down-Gravity
A rightward force is applied to a dresser to accelerate it to the right across the bedroom floor. Ignore air resistance.
Up- Normal Left-Friction Down- Gravity Right- Applied + Extended
A sledder has reached the bottom of a hill and is coasting to the right while slowing down along the loosely-packed snow. Ignore air resistance.
Up- Normal, Left-Friction, Down-Gravity
The cabin of a small freight elevator is secured to a motor by a cable and is moving upward with a constant speed. There is no contact between the cabin and the elevator shaft. Ignore air resistance.
Up- Tension Down- Gravity
The cabin of a small freight elevator is secured to a motor by a cable and is moving upward while slowing down. There is no contact between the cabin and the elevator shaft. Ignore air resistance
Up- Tension Down-Gravity + Extend
A hockey puck glides to the right across the ice at a constant speed. Ignore air resistance.
Up-Normal, Down-Gravity