A skater is standing on a skateboard and accelerating forward. Which of these fo
ID: 1359683 • Letter: A
Question
A skater is standing on a skateboard and accelerating forward. Which of these forces would NOT be included in the free body diagram of the system if the system under consideration is BOTH the skater and the skateboar
The frictional force of the ground
The skater's weight
The reaction force from the skateboard acting on the skater
The air resistance experienced by the skater
The frictional force of the ground
The skater's weight
The reaction force from the skateboard acting on the skater
The air resistance experienced by the skater
Explanation / Answer
The system is both the skate and skater. Free body diagram should include only external forces not internal forces. the forces that influence the system are frictional force and air resistence experienced by the skater and skater's weight.
When both skate and skater are considered as a system . motion of centre of mass of the system is influenced by external forces.
Weight is a result of external force of gravity so included.
free body diagram would not include - reaction force which is only internal to the system.