A simplified diagram that isolates a single object and represents all external forces acting on it as labelled arrows originating from the object's centre of mass.
A simplified picture that shows every push and pull acting on one isolated object.
Showing a random 20 of 50 problems.
Example 1
easy
A skydiver has reached terminal velocity. The free-body diagram contains weight and air drag. How do their magnitudes compare?
Example 2
medium
A 2 kg block on a 30∘ frictionless incline (g=10 m/s2). Find the normal force from its free-body diagram.
Example 3
easy
A 2 kg apple hangs from a string. Identify the forces on its free-body diagram and give their magnitudes. Use g=9.8 m/s2.
Example 4
easy
A 10 kg box rests on a flat surface. Draw and label all forces in the free-body diagram. What are their magnitudes? Use g=9.8 m/s2.
Example 5
medium
A 2 kg block sits on a table while a person presses down on it with 10 N. Draw the FBD and find the normal force from the table. Use g=9.8 m/s2.
Example 6
medium
On the FBD of a child sliding down a slide, name the three forces typically drawn.
Example 7
medium
On the FBD of a parachutist falling at constant velocity, weight is 700 N. What is the drag force?
Example 8
medium
A 5 kg block is pulled across a rough surface (μk=0.2) by a 30 N horizontal force. List all forces in the free-body diagram and find the acceleration. Use g=9.8 m/s2.
Example 9
medium
Two blocks (1 kg and 2 kg) touch and are pushed by 9 N on the 1 kg block on a frictionless floor. From free-body diagrams, find the contact force between them.
Example 10
medium
A 4 kg block is on a frictionless ramp at 30°. Resolve gravity into components parallel and perpendicular to the incline. Use g=9.8 m/s2.
Example 11
challenge
A 5 kg block lies on a 10 kg board on a frictionless floor. The coefficient of static friction between block and board is 0.4. What is the maximum horizontal force that can be applied to the board so the block does not slide on it? Use g=9.8 m/s2.
Example 12
easy
A book rests on a flat table. Which two forces appear on its free-body diagram?
Example 13
medium
A book is pressed against a vertical wall by a horizontal push so that it does not slide down. Name all forces on its FBD.
Example 14
easy
A ball is thrown upward and is momentarily at the top of its path (no air resistance). What is on its free-body diagram?
Example 15
hard
A 5 kg block on a 25° rough incline (μk=0.2) is released from rest. Find its acceleration down the slope. Use g=9.8 m/s2.
Example 16
easy
On a free-body diagram, should you draw the force the object exerts on the ground?
Example 17
easy
A 3 kg block slides at constant velocity on a horizontal floor while pushed with a 9 N horizontal force. What is the friction force on the FBD?
Example 18
easy
A box is pushed right across a rough floor. Name the four forces on its free-body diagram.
Example 19
hard
Two blocks (m1=2 kg on a frictionless table, m2=3 kg hanging) are connected by a string over a frictionless pulley (Atwood-on-table). Find the acceleration and string tension. Use g=9.8 m/s2.
Example 20
medium
A 4 kg block slides down a frictionless ramp inclined at 45°. Identify all forces in the free-body diagram and find the acceleration. Use g=9.8 m/s2.