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DSST Physics

Subjects : dsst, science
Instructions:
  • Answer 28 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. H is the sum of all forces acting on an object. For example - in a tag of war - when one team is pulling the tag with a force of 100 N and the other with 80 N - the net force would be 20 N at the direction of the first team (100 N - 80 N = 20 N).






2. Define how heat transfer relates to work done by a system and place some limitations on what it is possible for a system to achieve.






3. Is defined as the mass multiplied by the velocity. p= mv. Since the momentum depends on the velocity - it is also a vector quantity. The units for momentum are [kg.m.s-1]






4. Is the energy of motion --it's ability to do work. The faster the body moves the more is produced. The greater the mass and speed of an object the more __ __ there will be. As the train accelerates down the hill the potential energy is converted into






5. A concept that had an important part in the development and acceptance of the conservation of energy and the establishment of the science of thermodynamics in the 19th century.






6. An __ __ is the change in velocity at one moment.






7. Is a form of energy which is held in matter by the constant jostling of its particles. __ is an effect of the movement of particles. Particles transfer __ between one another by colliding with one another - and over time this will cause heat to flow






8. Is the resistance of any physical object to a change in its state of motion or rest - or the tendency of an object to resist any change in its motion.






9. Of an object helps define how that object's temperature responds to absorbing or transmitting heat. __ __ is defined as the change in heat divided by the change in temperature.






10. The __ __ is the ratio between the change in velocity and the time interval.






11. Is when heated particles transfer heat to another substance - such as cooking something in boiling water.






12. Is when two items that are in thermal contact no longer transfer heat between them.






13. Is the form of energy which transfers this energy from one body or system to another. This heat transfer can take place in a number of ways: convection - conduction - and radiation.






14. Is the bending of light rays when they cross an interface between two materials with different __ indices. For example - when light passes from air into the water at an angle - the light ray will bend toward the normal to the surface.






15. The force of __ always acts between pairs of bodies and is proportional to their masses. However - the force of __ also depends on the distance between the two bodies. As the two bodies are moved further apart - the __ational force between them decre






16. Is when heat flows through a heated solid.






17. A body that travels an equal distances in equal amounts of time along a circular path has a constant speed but not constant velocity. This is because velocity is a vector and thus it has magnitude as well as direction






18. Is one of the basic ideas of electricity in physics. The law looks at the forces created between two charged objects. As distance increases - the forces and electric fields decrease. This simple idea was converted into a relatively simple formula. Th

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19. Is a discipline of thermal engineering that concerns the generation - use - conversion - and exchange of thermal energy and heat between physical systems. __ __ is classified into various mechanisms - such as thermal conduction - thermal convection -






20. Is the flow of charge. The SI unit of current is the Amp. [A]. In mathematical terms we can describe the __ __ as the rate of change of charge with time. (I = dQ/dt.)






21. Is the same as stored energy. The 'stored' energy is held within the gravitational field. When you lift a heavy object you exert energy which later will become kinetic energy when the object is dropped. A lift motor from a roller coaster exerts __ __






22. ___ shows the change in velocity in a unit time. Velocity is measured in meters per second - m/s - so acceleration is measured in (m/s)/s - or m/s2 - which can be both positive and negative.






23. Is when heat is transferred through electromagnetic waves - such as from the sun. __ can transfer heat through empty space - while the other two methods require some form of matter-on-matter contact for the transfer.






24. Is measured in amperes or amps for short. We use the symbol 'I' in the formula to represent current. (The reason for using 'I' rather than 'C' - is that 'C' is already used for something else.)






25. Is defined as the rate at which work is done. If we replace the eqn for work - W=F.ds in (1) the power - the power is then P=F.(ds/dt) - we recognize that ds/dt is the average velocity - v therefore - work is also -P=F.v.






26. Is the 'force-displacement product' (for those of you who prefer algebra) W = F?s cos ? or the 'force-displacement path integral' (for those of you who prefer calculus).






27. Says that there is a relationship between these three factors. So if you know two of the values you can easily work out the third one.

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28. An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

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