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 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

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

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.

Ted is trying to move a fridge through his house, he gets stuck on a carpet and even though he is pushing the fridge, it is not moving. What force is acting against him?

• applied

• static friction

• kinetic friction

• normal

Name the missing force...

• frictional force
• weight force
• thrust
• buoyant force

Tags

NGSS.MS-PS2-2

Name the missing force...

• normal force
• applied force
• frictional force
• tension force

Tags

NGSS.HS-PS2-1