Physics Notes * If the vector of all sums is precisely zero the object could be still moving * IF an elevator fell ‚ the passengers would be trapped to the ceiling of the elevator seeing as there is no air resistance ‚ false * Constant speed = no acceleration = sum of all net forces is zero * An object in orbit around the earth is not truly weightless * Sitting half as far away from your class mate the gravitation force is four times as strong. (re2) * Newton’s First
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Masses and Springs 1. Spring Constant K1 = F/x1 = (.05kg)(9.8 N/kg) = 9.8 N/m .05m K2 = F/x2 = (.1kg)(9.8 N/kg) = 9.8 N/m .1m K3 = F/x3 = (.25kg)(9.8 N/kg) = 9.8 N/m .25m K avg. = 9.8 N/m 2. Unknown Masses Green: m = kx = 9.8 * .07 = .07kg = 70g g 9.8 Gold: m = kx = 9.8 * .155 = .155kg = 155g g 9.8 Red: m = kx = 9.8 * .3
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Definitions: define scalar and vector quantities and give examples; Scalar: Magnitude without direction Examples: Length‚ area‚ volume‚ distance‚ speed‚ mass‚ density‚ pressure‚ temperature‚ energy‚ work‚ power‚ electrical potential‚ charge‚ time Vector: A quantity that has (both) magnitude / size and direction Examples: Displacement‚ velocity‚ acceleration‚ momentum‚ force (lift‚ drag‚ thrust‚ weight)‚ field(s)‚ a.c. voltage‚ current (when calculating fields only) define displacement
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Time Dilation: The Spark of Time Travel Time‚ as most people know‚ is constant and never changing. In this case‚ most people believe that travelling through time is not attainable. However‚ in some views‚ principles and theories it was shown that it is indeed possible for time to be slower than its usual rate or the other way around; thus‚ it gave way to the possibility that time travel may be conceivable. Therefore‚ in this paper the researchers intended to know the factors that affect the rate
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time m/s Scalar • Plot and interpret a speed/time graph or a distance/time graph • Recognise from the shape of a speed/time graph when a body is – at rest – moving with constant speed – moving with changing speed • Calculate the area under a speed/time graph to work out the distance travelled for motion with constant acceleration • Demonstrate some understanding that acceleration is related to changing speed Symbol Definition SI unit Vector / Scalar Acceleration a Acceleration = change
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to conservative forces‚ like the gravitational force‚ the mechanical energy is constant. If an object is moved in the opposite direction of a conservative net force‚ the potential energy will increase and if the speed (not the velocity) of the object is changed‚ the kinetic energy of the object is changed as well. In all real systems‚ however‚ non-conservative forces‚ like frictional forces‚ will be present‚ but often they are of negligible values and the mechanical energy’s being constant can therefore be a useful
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7 Holt Physics Chapter 7: Rotational Motion and the Law of Gravity I. Section 7-1: Measuring Rotational Motion A. When something spins it undergoes “rotational motion”. When something spins around a single point it is called “circular motion”. B. We measure how fast something spins not in m/s (different points on the object are spinning at different velocities) but by measuring the angle described in a given time period. C. Angles can be measured in radians
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the drop would be less as the gravitational force on a substance is directly proportional to its mass‚ shown by the equation below . F=(G〖m_1 m〗_(2 ))/r^2 G=gravitational constant m_1=mass of object 1. Which in this case is constant as it refers to the mass of the earth. m_2=mass of object 2. Which is the mass of the drop r^2= the distance between the objects. F= gravitational force Therefore if the force to separate the water is less the gravitational force needed for a drop of water
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Velocity is the rate of change of displacement. Uniform acceleration Uniform acceleration is a constant rate of change of velocity. C4: Mass‚ Weight and Density Mass Mass is a measure of the amount of substance in a body. Gravitational field Gravitational field is a region in which a mass experiences a force due to gravitational attraction. Gravitational field strength Gravitational field strength is the gravitational force per unit mass. C5: Turning Effect of Forces Principle of moments The principle of
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gun and to predict the landing point when the projectile is fired at a nonzero angle of elevation. EQUIPMENT Spring gun Metal ball Protractor Meter stick Ruler Whiteboard markers THEORY Projectile motion is an example of motion with a constant acceleration. In this experiment‚ a projectile will be fired from some height above the floor and the position where it lands will be predicted. To make this prediction‚ one needs to know how to describe the motion of projectile using the laws of
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