Holy Spirit: The Hand of The Lord - Part 1 - Ps Ashish Raichur
Friday PS 10-19 Test Review Hand in day Work/power.
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Transcript of Friday PS 10-19 Test Review Hand in day Work/power.
![Page 1: Friday PS 10-19 Test Review Hand in day Work/power.](https://reader035.fdocuments.us/reader035/viewer/2022062511/551adafa55034656628b65d8/html5/thumbnails/1.jpg)
Friday PS 10-19
Test Review
Hand in day
Work/power
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Hand in
• Yellow workbook
• Seat-belt position paper
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Review for test on Monday
• ForcesDefinition- any push or pull on an objectUnits are NEWTONSIdentification
Applied forcesFrictionGravitational forcesMagnetic, electric forces
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Forces
• Balanced forces = when all the forces acting on an object cancel each other out
• Unbalanced forces = when all the forces do not cancel each other out (more force on object in one direction than in others)
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Net force
• The combination of all forces on an object
• For balanced forces Fnet = 0
– At rest or at constant velocity
• For unbalanced forces Fnet ≠ 0
– acceleration
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Weight, mass
• Weight = the force due to gravitational pull on an object
W = mg g = 10 m/s2 on earth
• Mass = the amount of matter that makes up an object
• Differences? Similarities?
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Inertia
• Is the measure of an objects resistance to change in its motion
• Directly related to the amount of mass
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Newton’s 3 laws
• !st
• 2nd
• 3rd
• When does an object change its motion (accelerate)?
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Collisions and the laws
• Be able to use the laws of motion to explain what happens in different types of collisions
• Front crash• Rear crash• At least 2 reasons for head rests• Does the bus and the car exert the same
amount of force on each other?• Why are people less injured on the bus?
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Collisions and the laws
• Seat-belt configurations
• What is wrong with just lap-belts?
• Why are seat-belts flat and wide?
• What are uses for EKG’s, MRI’s and Xrays?
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Free body diagrams
• FBD’s purpose: To visually show how the forces are arranged on an object
• Components of a free-body diagram– Forces– Object– Direction arrow
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FBD
• Where do all but the direction arrow originate in the diagram?
• How are the forces of air resistance or friction drawn on FBD?
• How is the force of gravity drawn on any FBD?
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2nd law problems
• Using Fnet = ma
• Units for each part are…?
• Triangle set-up
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Advanced 2nd law problems
#1 Have to use the acceleration equation first then use 2nd law
#2 Have to determine Fnet first, then use 2nd law
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Example
• Nicole slows down in her BMW from 15 m/s to 3 m/s in 42 seconds. What is the mass of her car if the net force on it is 7312 N?
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Law Universal Gravitation
• There is a gravitational attraction between any two items that have mass.
• The amount of the force is related to the mass of each object and the distance their centers are apart
• More mass, less distance greater force
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Free Fall
• Any object that moves under the influence of only the force due to gravity
• Thrown, Dropped objects
• Acceleration = 10 m/s2 or (9.8)
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Terminal velocity
• The maximum velocity reached by a dropped object
• Occurs when the downward gravitational force is matched by the upward force of air resistance
• Air resistance depends on surface area and speed of object
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Action and reaction forces
• Identification in the real world
• Equal and opposite
• Applied to different objects
• May have different effects
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Momentum
• A quantity of motion
• The value of an objects mass times its velocity
• To have momentum the object has to be ___________.
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Change in momentum
• To change an object’s momentum requires a net force being applied
• The greater the force and the longer the time applied the bigger change in momentum
• Baseball/softball examples• Fender benders vs totaling the car
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Momentum change in a accident
• The amount of change in momentum is constant
• Change can be brought about different ways
More time less forceLess time more force
Seat Belts, crumple zones, air bags, Padded dashboards
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Conservation of momentum
• In a system, momentum can not be created or destroyed, but can be transferred
• Momentum is direction oriented
• Billiards balls
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Metric conversion
• 0.302 km _________ mm
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What is the difference between distance and displacement?
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Homework
• P368-370
Problems 7-11
Problems 18-20
Problems 32,34,39,40
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Answers to homework
• P368-370
7 B
8 D
9 B
10 D
11 A
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• 18 Free fall means there is only the force of gravity
Weightlessness = no force of gravity
19 less force of gravity, so acceleration due to gravity is less than 9.8
20 when the upward force of air resistance = force of gravity
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• 32 a 195 kg m/s• 32 b 440 kg m/s• 32 c 0 kg m/s• 32 d 12 kg m/s
• 34 gravitational force is much less (1/16th)• 39 acceleration would be doubled• 40 a. Train, b. ball, c. equal, equal but
opposite