Exam 1: Chapters 1-4
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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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Exam 1: Chapters 1-4 60% Problems – one problem from WebAssign with different numbers

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Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

  • 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


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

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.


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

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.


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

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


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

Fig. 5.1, p.113


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

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.


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

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%.


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

A.

B.

C.

D.

E.

CT4


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

A.

B.

C.

D.

E.

CT5


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

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.


Acceleration is proportional to force

Acceleration is Proportional to Force


Acceleration is inversely proportional to mass

Acceleration is Inversely Proportional to Mass


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

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)


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

  • 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.


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

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.


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

CT7

A.

B.

C.

D.

E.


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

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.


Two astronauts pushing a satellite with forces that differ in magnitude and direction

5-5 The Vector Nature of Forces

Two Astronauts Pushing a Satellite with Forces that Differ in Magnitude and Direction


P5 22 p 137

P5.22 (p.137)


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

P5.28 (p.138)


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

Orbit of Moon about the Sun

Actual

Exaggerated and incorrect


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

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.


P5 35 p 138

P5.35 (p.138)


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

  • 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.


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

  • 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.


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

  • 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.


5 7 normal forces the normal force may equal the weight

5-7 Normal ForcesThe Normal Force May Equal the Weight


The normal force may differ from the weight

The Normal Force May Differ from the Weight


An object on an inclined surface

An Object on an Inclined Surface

P5.42 (p.138)


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

  • Concept Question 12

  • P5.42b: If the angle of the incline is decreased, the normal force will

  • increase.

  • decrease.

  • stay the same.


Exam 1 chapters 1 4 60 problems one problem from webassign with different numbers

A.

B.

CT13


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