Friction and Free Body Diagrams

A box slides across a floor at a constant velocity. What forces act on the box?

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

A box is moving to the left up a ramp. Which way is the force of friction pointing?

• down the ramp to the right
• up the ramp to the left
• there is no friction
• straight up

Tags

NGSS.HS-PS2-1

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.HS-PS2-1

What is the direction of the tension force from the attached rope?

•  there is no tension
• straight up
• straight down
• up the ramp to the right

Tags

NGSS.HS-PS2-1

What forces act on the ball as it moves around the "perfectly smooth" loop? ("perfectly smooth" suggests there is NO friction)

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

Tags

NGSS.HS-PS2-1

What is the direction of the force of gravity acting on the box?

• down the ramp to the right
• straight up
• straight down
• up the ramp to the left

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

What symbol do we use to represent a "body" in a free-body diagram?

• small dot
• small box
• an outline of a human body
• small triangle

When completing a free-body diagram, how should you draw the force arrows on the "body"?

• with the arrow tail touching the body
• with the arrow tip touching the body
• it does not need to touch the body
• it doesn't matter, tail or tip can touch

What is the Conversation of Momentum?

• momentum before a collision is equal to momentum after a collision
• to conserve momentum we must not use any
• it is good to save momentum for important times
• when we transfer momentum between two things, some is lost as heat

Tags

NGSS.HS-PS2-2

Ms. Schmidt comes in the morning and moves a box of textbooks to the right with 50 N of force. Mr. Jensen comes in the afternoon and moves the same box of textbooks to the left with 150 N of force. What is the net (resultant) force?

• 200 N
• 100 N left
• 100 N right
• 0 N

Tags

NGSS.HS-PS2-1