Survey
* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project
Download Force and Motion Unit Test
Document related concepts
Modified Newtonian dynamics wikipedia , lookup
Faster-than-light wikipedia , lookup
Coriolis force wikipedia , lookup
Equations of motion wikipedia , lookup
Length contraction wikipedia , lookup
Electromagnetism wikipedia , lookup
Newton's theorem of revolving orbits wikipedia , lookup
Fictitious force wikipedia , lookup
Classical mechanics wikipedia , lookup
Rigid body dynamics wikipedia , lookup
Relativistic mechanics wikipedia , lookup
Work (thermodynamics) wikipedia , lookup
Centrifugal force wikipedia , lookup
Classical central-force problem wikipedia , lookup
Hunting oscillation wikipedia , lookup
Transcript
b. moving faster. c. at rest. d. slowing down. 42. A mechanical device requires 400 J of work to do 340 J of work in lifting a crate. What is the efficiency of the device? a. 0.9% c. 85% b. 60% d. 118% 43. What is the momentum of a 50-kilogram ice skater gliding across the ice at a speed of 2 m/s? a. 25 c. 48 kg m/s b. 50 kg d. 100 kg m/s 44. Which of the following is an example of a wheel and axle? a. a pencil b. a jar lid c. a doorknob d. an automobile steering wheel 45. Which of these is an example of deceleration? a. a roller coaster moving down a steep hill b. an airplane following a straight flight path
