Free Body Diagrams and Center of Mass

Which term is used to refer to the object under consideration in a free body diagram analysis?

• Mass hanger

• Pulley

• System

• Force

A block is being pulled along a horizontal table top by a string passing over a pulley, with several masses attached to the string. What type of force acts parallel to the surface and resists the sliding motion of the block?

• Magnetic force

• Gravitational force

• Kinetic friction

• Electric force

Which of the following is an example of a long range force?

• Kinetic friction

• Normal force

• Tension force

• Gravitational field

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5

What is the main purpose of constructing free body diagrams in the analysis of dynamics problems?

• To select relevant forces and represent them with vector notations

• To determine the color of the object

• To measure the speed of the system

• To calculate the mass of the object

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-3

A block is sliding on a table and is attached to a string passing over a pulley. Explain how both contact and long range forces are acting on the block in this scenario.

• Contact forces include friction and tension; long range force is gravity.

• Contact forces include only friction; long range force is tension.

• Contact forces include gravity and tension; long range force is friction.

• Contact forces include only tension; long range force is friction.

Tags

NGSS.MS-PS2-4

Which of the following is the correct symbol for the force of gravity?

• Fs

• Fk

• FT

• Fg

What is the purpose of constructing a set of coordinate axes on a free body diagram?

• To provide a frame of reference for describing the object's motion

• To label the forces with subscripts

When creating a free body diagram, what should be done after sketching the system and its surroundings?

• Write the equations of motion

• Draw all the forces as arrows

• Measure the mass of the system

• Enclose the system within a system boundary

What does the dashed line around the object represent when creating a free body diagram from a sketch?

• The gravitational field

• The velocity vector

• The system boundary

• The direction of motion

Why is it important to label force vectors with appropriately subscripted symbols on a free body diagram?

• To clearly identify the type and source of each force acting on the system

• To show the temperature of the system

• To make the diagram look more colorful

• To indicate the speed of the object

Tags

NGSS.HS-PS2-1