FORCES

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

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

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.

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

NGSS.MS-PS2-1

A type of friction that occurs when air pushes against a moving object causing it to decelerate.

• surface area
• air resistance
• velocity
• gravity 

A box slides across a perfectly smooth floor at a constant velocity. (The phrase "perfectly smooth" suggests that there is NO friction). What forces act on the box?

• tension, gravity
• tension, gravity, normal force
• tension, gravity, normal force, friction
• gravity, normal force, friction

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1