Forces and Free Body Diagrams

Which of the following is possible for an object with balanced forces acting on it? (Choose all that apply)

• at rest

• moving at constant speed

• changing direction

• slowing down

Which of the following is possible for an object with unbalanced forces acting on it? (choose all that apply)

• Moving to the right with a constant speed of 3 m/s

• Moving to the left with rightward acceleration

• changing direction

• at rest

Tags

NGSS.MS-PS2-2

Whenever an object is moving, there is always this force opposing the motion:

• inertia

• momentum

• friction

• applied force

Which diagram best shows person pushing a couch (accelerating) across the floor?

• 
• 
• 
• 

Tags

NGSS.HS-PS2-1

Which of these include only contact forces?

• F_app F_g F_norm

• F_app F_tens F_norm

• F_b F_app F_g

• F_air F_norm F_g

The force that keeps objects on top of surfaces instead of letting them sink into the surface is known as:

• normal

• abnormal

• static

• inertia

Tags

NGSS.3-PS2-1

The hockey puck is moving at a constant velocity across the ice. What forces does the puck experience at this moment?

• None

• Gravity

• Gravity and Normal

• Gravity, Normal, and Friction

• Gravity, Normal, Friction, and Applied

Tags

NGSS.HS-PS2-1

Which is the best description of tension force in a system with balanced forces?

• The force that opposes motion

• The force that opposes weight

• The force in a string that is equal to weight

• The force that opposes friction

Rougher surfaces have ...

• greater friction
• less friction
• the same level of friction

What is a normal force?

• It always opposes gravity.
  The same as a frictional force.
• It is equivalent to the weight of an object.
• It acts perpendicular to a contact surface.
• It is equivalent to inertia.