Download Study Guide For Unit 3 Test

Honors Physics Study Guide for the Unit 3 Test
Content overview

Kinematics
o 5 Problem solving steps
o Graph models and math models
o Zones

Vectors/Scalars
o 3 representations
 Draw to scale with reference axes
 Identify magnitude & direction
 Sum of perpendicular components
o Tail-to-tip method of vector addition & subtraction
o Resultant vectors
 AKA: Net vectors
o Compass points and alternate types of axes

Statics/Kinetics (Forces)
o Names, types, & descriptions
 Weight (Fg)
 AKA: Gravitational force
 Fg = mg
 Long-range/non-contact due to the entire earth directed downward
 “m” refers to the mass of an object in kilograms
 “g” refers to the gravitational field strength in N/kg
o At or near the earth’s surface, g = 9.8 N/kg
 Normal (FN)
 Contact force, exerted by a surface, directed perpendicular to the surface
 Magnetic (FM)
 Long-range/non-contact, due to the magnet
 Tension (FT)
 Contact force, exerted by a tether, directed along the tether
 Friction (FFR)
 Contact force, exerted by a surface, directed parallel to the surface to oppose
motion
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Agent/object notation
Shorthand notation
 Subscripts
 ┴ or ||
Newton’s 1st law of motion
 ΣF = 0 ↔ ∆v = 0
 If an object's velocity is not changing, the sum of the forces on the object is zero.
 If an object's velocity is changing, the sum of the forces on the object is not zero.
 This non-zero sum of forces is referred to as the “net force.”
 RECALL: Dry ice demo
Newton’s 3rd law of motion
 Pairs of forces are exactly equal in magnitude and opposite in direction.
 RECALL: Stations lab
Free-body diagrams
 Reduce object to a single point.
 Draw all force vectors acting on the object with the tails originating from the point.
Honors Physics Study Guide for the Unit 3 Test
1. A paper airplane flies at 8 m/s 35o South of East.
A) How fast did it fly in the south direction?
B) How fast did it fly in the east direction?
2. A boat’s motor drives it due north 3 km, and a current pushes it west 1 km.
A) What is the magnitude of the boat’s displacement?
B) What is the specific direction of the boat’s displacement?
3. Draw a complete free body diagram using agent/object notation for a person leaning against a wall.
4. A standard gold bar has a mass of 12.4 kg. How much does it weigh?
5. A dragster accelerates from rest to 145 m/s in 4.5 seconds. Then, the dragster deploys a parachute
slows it to a stop in 11 seconds.
A) What is the acceleration during the first 4.5 seconds?
B) What is the acceleration during the last 11 seconds?
C) How far did the dragster travel total?