2.2.2

Question 1

what is velocity ?

Answer 1

change in displacement over time

Question 2

when is the one time that acceleration remains constant ?

Answer 2

when caused by earths gravitational attraction

Question 3

whats the gravitational acceleration on earth ?

Answer 3

9.8m/s

Question 4

what is a pendulum ?

Answer 4

wire attached to pivot point with weighted ball which swings freely under gravity

Question 5

does mass of weight / bob on pendulum make a difference to the periodic time ?

Answer 5

no

Question 6

does the length of the pendulum make a difference in the periodic time ?

Answer 6

yes

Question 7

what is damping forces ?

Answer 7

resistance on the body which reduces the amplitude such that after a while, the body will come to a stop

Question 8

what does damping decrease ?

Answer 8

vibrations

Question 9

what is the definition of vibration ?

Answer 9

mechanical oscillations

Question 10

whats the 4 types of vibration ?

Answer 10

-free vibration
-forced vibration
-harmonics
-resonance

Question 11

what is the lowest frequency of a periodic waveform called ?

Answer 11

fundamental frequency

Question 12

what is velocity ratio ?

Answer 12

its how far the effort has to move in relation to the load

Question 13

whats the mechanical advantage ?

Answer 13

ratio of the force produced by a machine to the force applied to it

Question 14

whats 3 examples of a first class lever ?

Answer 14

-seesaw
-crowbar
-claw hammer

Question 15

where is the fulcrum located on a second class lever and whats a example ?

Answer 15

-located at one end of the lever
-wheel barrow

Question 16

where is the effort applied located on a third class lever ?

Answer 16

between the fulcrum and the resistance load

Question 17

whats a example of a third class lever ?

Answer 17

aircraft landing gear

Question 18

explain a incline plane and say a example of one ?

Answer 18

-surface inclined to a horizontal plane at any angle but a right angle.
-baggage conveyor

Question 19

whats the equation for horsepower ?

Answer 19

torque x rpm
——
5252

Question 20

what is efficiency measured in ?

Answer 20

percentage