Free Body Diagrams
Newton's Laws
Do Now Review
3rd Law of Motion
UC Irvine Physics and Astronomy Videos
School blocks YouTube? Download file below.
Review
Click on the button below to start the game.
One of these things is not like the other!
The idea for this game and the graphic above come from a great physics teacher named Kelly O'Shea.
Review
Explain this using Newton's Laws of Motion
Explain this using Newton's Laws of Motion
Video Instruction
showmethephysics.com
B) Free Body Diagrams
Diagrams that show the forces acting on an object
Ex 1) Lamp on a Table
(1) upward force supporting on an object
(2) Always drawn perpendicular to surface where 2 objects meet
(3) When an object is placed on a horizontal surface
Object Resting on an Incline Plane
Weight force? Normal Force? Friction?
Weight force? B Normal Force? C Friction? D
Ex 2) Object at Rest on an Incline Plane
Drag and Drop the vector arrows to show the forces acting on a box resting on a ramp.
Click on the picture above
Calculating the Components of Weight Relative to a Ramp
| Onsite |
by Dr. Michael R. Gallis - Penn State Schuylkill
SchuylkillGo Nittany Lions!!
[Flash]
Show Me The Physics
Rank the parallel component on the boxes below, from largest to smallest. Justify your answer.
Video Instruction
showmethephysics.com
Ex 3) Force on a Falling Object
(before terminal velocity)
Downward Force - Weight Force
Upward Force - Friction
Ex 4) Block Pulled to the Right at Constant Velocity
What force is on this block that is also on you?
Now draw the applied force
Draw the last force
Last force is the friction force
How could this box be moving if all the forces are balanced?
Ex 5) Forces on a Projectile Moving Left to Right
What force is on this ball that is also on you?
If there is no forward force on this ball, how could it move forward?
- Aristotle
Della Porta Collection then Borghese Collection; purchased in 1807
Galileo (and Newton) would say ...
I Will Derive!!
Review
Which plots below represent an object in a state of equilibrium?
A, C, D
NYSSLS Reading Passage · Dynamics
The Physics of Survival
Open Reading Passage → Regents Practice Version →Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. What is a free body diagram?
2. A lamp weighing 20 N rests on a horizontal table. What is the normal force on the lamp?
3. A box rests on a ramp. Compared with the box's weight, the normal force on it is…
4. A block is pulled to the right at constant velocity. What is true about the forces on it?
5. A ball flies through the air from left to right (ignore air resistance). Which force(s) act on it?
Free-Body Diagrams of a Kicked Soccer Ball
A soccer ball is kicked into the air and follows a curved path across a field. Air resistance is negligible. Students drew free-body diagrams to model the forces on the ball at several points after it left the player’s foot.
Which statement correctly describes the force(s) on the ball at the highest point of its path?
▶ Want a challenge? Open 6 more Regents-style questions (harder · mixed formats)
Challenge score: 0 / 6
C1. A skydiver falls at a constant terminal velocity. Which statement is correct?
C2. A student makes the following claim.
Place a check mark in either the Support or Refute box. Justify your response.
C3. The soccer ball has a mass of 0.43 kg. While it is rising, choose the direction of the net force on the ball, and determine its magnitude.
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C4. A person stands on a scale in an elevator that is accelerating upward. Which comparison is correct?
C5. An 8.0-kg box is pulled to the right with a 40.-N horizontal force while 16-N of friction acts on it. Substitute numerical values into a mathematical representation that can be used to determine the box’s acceleration. Then calculate the acceleration.
C6. Describe the free-body diagram for the soccer ball just before it lands, and explain how it compares with the free-body diagram at the highest point of its path.
