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45 Cards in this Set
- Front
- Back
What are three are measured
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Length, mass, and time
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Three things that are measureable
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Length, mass, time
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Converison are use ful for
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can be multily by 1. may be devided by the number of units of measurement that that on would equal to.
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What are example that are vectors
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Velocity, Acceleration, Impulse, Momentum, and Torque
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What is acceleration
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time rate of change of velocity.
assumes to be constant(but might not). Time rate of change of a position vs. time table |
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What is velocity.
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how fast and what direction the object is going. Slope of the displacement vs time graph. Time rate Position.
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What is free fall
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It is the accleration near the earths surface. Ignoring air resistance. 9.8 meters over second square.
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Why is velocity a vector?
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Velocity has a magnatude and a direction. Acceleration is the change in the velocity
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Why can't either magnitude or the direction of the velocity can change?
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Magnitude: Acceleration because changing Magnitude is tangential. Direction: Acceleration because of changing direction is radial(inward) with magnitude changing velocity squared divided by radius.
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What happen in projectille motion.
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There is a horizonal velocity is constant the vertical velocity changes due to gravity.
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What are two cases of 2-D movement.
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Projectille and Curved motion
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What is the first law of motion of "The Law of Inertia"
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An object at rest will continue to be at rest unless acted appon. An object in motion will continue at motion with the same speed unless acted apon by an unbalance force.
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What is the second law of motion.
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net force would equal mass times acceleration.
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What is the third law of motion.
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to every action there is always an opposite or equal reation force.
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What are examples of contact forces.
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Normal(perpendular to the surface), Friction(parellel to the surface), Tention, and Spring.
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What is the best why to identif the forces
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Drawing a free body diagram.
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What is Static Friction
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The force that keeps some thing in place
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What is Kinetic Friction
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The force of friction that acts on the object while it is moving.
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What is an example of a none contact force.
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Gravity
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Which is easier formulas or numbers
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formulas because you can check if the trend and limits are reasonable.
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how do you find the speed of the object with a known force traveling in a circle.
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replace the variable for acceleration with the formula for centriptal acceleration.
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What is work
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Force applied to a distance.
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What is conservative energy
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Same amount of energy goes out from potental energy to kinetic energy
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What is work measured in?
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Joules
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How do you calculate kinetic energy?
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mass times velocity squared
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What should be considered when calculating the work of friction.
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Friction is a non-conservative force. work is done depends on the path. Friction is usually opposite direction of the path of work so work of friction is often negaive.
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What is potental energy?
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Stored energy that is either as sping or gravitational
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When working with potental energy what should be considered?
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Work is done depending on endpoints. if you end where you begin, no net work is done.
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How can work and potental and kinetic energy relate.
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Work is equal to the change in potental and kinetic energy.
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What is Impulse?
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Change in momentum. Force x time.
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What is momentum
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Mass time velocity.
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What is an elastic collision.
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A collision that transfers the kinetic energy from one object to another. a cule ball on the pool table hiting another ball.
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What is an inelastic collision?
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A collision that the object in collision would would move together. a car wreak that the cars become intagained with each other.
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What is the frist moment of inertia?
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Center of mass (average location of mass) is where the object or system behaves in many ways like a point mass.
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What is the second moment of inertia?
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moment of Inertia (I) is analogous to mass (measured of inertia) but for rotation
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What is torque?
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Force times radius. A force is applied to a radius.
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What is the case of a closed system?
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Internal torque cancels. If External Torques vanish then Angular momentum is conserved
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What does it mean to be in equalibrium?
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All forces are balance in all directions. All torques balance (No net torque cause rotation). No translational acceleration(may have a constant velocity). not rotational acceleration. (spinning constant or 0).
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What are fluids?
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liquids and gases share the ablity to flow, they are both called fluids
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What are some charactersitics of a liquid?
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take the shape of a container; density is usally close to a solid and more then a gas.
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What are characteristics of a gas?
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disperse to fill every space of the container, and maintains a fairly constant density.
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What is pascals principle?
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pressure changes everywhere in the fluid.
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What is Archimedes's Principle.
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constant force with a fluid (buoyant force) is equal to the weight of the displace fluid.
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What is Bernoulli Equation?
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the applying work-energy theorem to fluids(per unit volume).
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How to do you calculate density?
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Density = mass divide by volume.
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