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Exam 1: Chapters 1-4 60% Problems – one problem from WebAssign with different numbers Understand homework problems Review notes and text Try new problems 40% Multiple Choice Questions Review Power Points (on web page) Review Before Class Assignments Try Questions

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slide1

Exam 1: Chapters 1-4

  • 60% Problems – one problem from WebAssign with different numbers
    • Understand homework problems
    • Review notes and text
    • Try new problems
  • 40% Multiple Choice Questions
    • Review Power Points (on web page)
    • Review Before Class Assignments
    • Try Questions
  • Graphs, Pictures and Drawings (Sketches)
  • Don’t rely on memorized equations
slide2

Chapter 5 The Laws of Motion

5-1a Force – a push or pull.

  • CT1: The force of the elevator on Norbert and Zot is
  • up.
  • down.
slide3

Assume the elevator is near the Earth’s surface and that it is right-side up in the cartoon.

  • CT2: The force of the non-sticky elevator surface on Norbert and Zot is
  • up.
  • down.
slide4

Assume the elevator is near the Earth’s surface and that it is right-side up in the cartoon.

  • CT3: The acceleration of Norbert and Zot is
  • up.
  • down.
  • zero
slide6

5-1 B. Mass

The mass of an object is the amount of matter (stuff) in that object. It is the same for a given object everywhere in the Universe. Mass is also called inertia because it resists being moved.

slide7

5-2 Newton’s First Law: A body remains in uniform motion (or at rest) unless acted upon by a net external force.

  • acceleration due to Earth’s rotation  0.03 m/s2
  • acceleration due to Earth’s orbit  0.006 m/s2
  • acceleration due to Sun’s orbit  2 x 10-10 m/s2

An inertia frame of reference is a coordinate system (or frame) in which Newton’s Law’s hold.

We will assume that the Earth’s surface is an inertial frame and not make errors greater than 0.03/10 = 0.3%.

slide8

A.

B.

C.

D.

E.

CT4

slide9

A.

B.

C.

D.

E.

CT5

slide10

5-3 Newton’s Second Law: The net external force is equal to the mass times the acceleration.

F = ma

Force and acceleration are vectors

  • Fx = max
  • Fy = may remember Galileo!
  • Fz = maz

Normally we will do problems in a plane with only x and y components.

calibrating a force meter
Calibrating a “Force Meter”

Experiments show forces add as vectors.

slide14

Applications of Newton’s Laws - Method

  • Draw picture of the problem.
  • Choose body (bodies) to isolate.
  • Draw Free Body Diagrams (FBDs) for isolated bodies.
  • Choose and label coordinate axes.
  • Apply Newton’s 2nd Law: Fx = max and Fy = may
  • Solve for F, m or a.
  • Work out kinematics.
  • Check solution is reasonable.

P5.6 (p.136)

slide15

Concept Question 6

  • P5.6b: If the parachutist comes to rest over a shorter distance, the force exerted by the ground will be
  • greater.
  • less.
  • the same.
slide16

FAB

A

B

FBA

5-4 Newton’s Third Law: If body A acts on body B, then body B acts back on body A with a force equal in magnitude but opposite in direction.

FAB and FBA are 3rd Law pairs.

slide17

CT7

A.

B.

C.

D.

E.

slide20

P5.18

(p.137)

  • Concept Question 8
  • P5.18b: If the 5 N force is applied to the heavy box instead, the contact force between the boxes will be
  • greater.
  • less.
  • the same.
slide24

Orbit of Moon about the Sun

Actual

Exaggerated and incorrect

slide25

y

x

5-6 Gravitational Force or Weight

Fg = mg (weight)

g = -9.81 j (m/s2 )

Apparent Weight is the force you actually feel pushing on you – often the floor.

slide27

Concept Question 9

  • P5.35b: If the constant speed of descent is greater than 1.1 m/s, the force of air resistance is
  • greater.
  • less.
  • the same.
slide28

Concept Question 10

  • P5.33a: Your normal weight is 610 N and the scale in the elevator reads 720 N. The acceleration of the elevator
  • upward.
  • downward.
  • zero.
slide29

Concept Question 11

  • P5.33c: Your normal weight is 610 N and the scale in the elevator reads 720 N. The magnitude of the velocity of the elevator is
  • increasing.
  • decreasing.
  • zero.
  • impossible to determine without more information.
slide33

Concept Question 12

  • P5.42b: If the angle of the incline is decreased, the normal force will
  • increase.
  • decrease.
  • stay the same.
slide34

A.

B.

CT13

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