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DSST Physical Sciences: Mechanics
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DSST Physical Sciences: Mechanics
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18 Questions

1. Combining length and time will give the ________ of change of position. It is the basis of describing motion in terms of speed and velocity.

2. Is the rate of doing work or the rate of using energy - which are numerically the same. If you do 100 joules of work in one second (using 100 joules of energy) - the power is 100 watts = Work/Time

3. Friction is the force resisting the relative motion of solid surfaces - fluid layers - and material elements sliding against each other. When surfaces in contact move relative to each other - the friction between the two surfaces converts kinetic ene

4. Refers to an activity involving a force and movement in the directon of the force. A force of 20 newtons pushing an object 5 meters in the direction of the force does 100 joules of work = F(force) * d (distance)

5. Linear momentum or translational momentum (pl. momenta; SI unit kg

6. An artificial satellite orbiting the Earth at constant height - a stone which is tied to a rope and is being swung in circles - a car turning through a curve in a race track - an electron moving perpendicular to a uniform magnetic field - and a gear

7. The tendency of a force to rotate an object about an axis - fulcrum - or pivot. Just as a force is a push or a pull - a torque can be thought of as a twist to an object - a measure of the turning force on an object such as a bolt or a flywheel. For e

8. A mechanical device that changes the direction or magnitude of a force. In general - they are the simplest mechanisms that provide mechanical advantage (also called leverage). Usually the term refers to the six classical simple machines which were de

9. The location of a specified object. To defined a position of an object - we must give a reference point or location. If an object changes its position - then the motion has occurred. If an object is undergoing a continuous change in position - then

10. The mutual forces of action and reaction between two bodies are equal - opposite and collinear.

11. Periodic motion - in physics - motion repeated in equal intervals of time. Periodic motion is performed - for example - by a rocking chair - a bouncing ball - a vibrating tuning fork - a swing in motion - the Earth in its orbit around the Sun - and a

12. The acceleration a of a body is parallel and directly proportional to the net force F and inversely proportional to the mass m - i.e. - F = ma.

13. Conservation of momentum is equivalent to the fact that the physical laws do not depend on...

14. The force of gravity is the force exerted by the gravitational field of a massive object on any body within the vicinity of its surface. This force is dependent on three factors: the mass of the massive object - the mass of the smaller body - and the

15. In physics - circular motion is a movement of an object along the circumference of a circle or rotation along a circular path or a circular orbit. It can be uniform - that is - with constant angular rate of rotation (and thus constant speed) - or non

16. States that the total amount of energy in an isolated system remains constant over time. The total energy is said to be conserved over time. For an isolated system - this law means that energy can change its location within the system - and that it c

17. States that if no external force acts on a closed system of objects - the momentum of the closed system remains constant. One of the consequences of this is that the center of mass of any system of objects will always continue with the same velocity

18. Lever - Wheel and axle - Pulley - Inclined plane - Wedge - Screw