Kinetics

Question 1

Equation for distance

Answer 1

Average speed x time

Question 2

Five equations of motion

Answer 2

V = u + at
S = (u + v) t / 2
S = Ut + 1/2 at2
V2 = u2 + 2as
H = Ut + 1/2 gt2

Question 3

Define acceleration

Answer 3

Change in speed over time

Question 4

What is the number for gravity

Answer 4

9.81

Question 5

What is centripetal force?

Answer 5

When the acceleration is going in the same direction as the force.
Constant change in direction, constant acceleration

Question 6

Formula for centripetal force?

Answer 6

Mass x Velocity2 / Radius

Question 7

Formula for centripetal acceleration

Answer 7

Velocity squared / radius

Question 8

What is vibration

Answer 8

Mechanical oscillations about an equilibrium point

Question 9

What is free vibration.

Answer 9

A mechanical system set off with an original input then allowed to vibrate freely

Question 10

What is forced vibration

Answer 10

Alternating force is applied to a mechanical system.

E.g washing machine

Question 11

What is resonance

Answer 11

The tendency of a system to oscillate at maximum amplitude at a certain frequency.

Question 12

What is velocity ratio?

Answer 12

Mechanical advantage. The ratio of effort for loading movement

Question 13

What is the equation for velocity ratio.

Answer 13

Distance moved by effort / distance moved by load

Question 14

How is mechanical advantage calculated ?

Answer 14

Resistance / Effort

Question 15

What are the two types of mechanical advantage

Answer 15

Actual mechanical advantage

Ideal mechanical advantage

Question 16

What is actual mechanical advantage

Answer 16

Ratio of output force to input force.

Fo / F1

Question 17

What is ideal mechanical advantage

Answer 17

Would exist if there was no friction in the machine.
D1/ Do
Ratio of input distance to output distance

Question 18

Formula for work

Answer 18

Work = f x d

Question 19

Example of class 1 lever

Answer 19

Seesaw

Question 20

Example of class 2 lever

Answer 20

Wheelbarrow

Question 21

Difference between class 1 and class 2 lever

Answer 21

The resistance and effort on class 2 move in the same direction

Question 22

Example of class 3 lever

Answer 22

Aircraft landing gear

Question 23

What are inclined planes

Answer 23

Another way to gain mechanical advantage.

E.g ramp

Question 24

What are spur gears

Answer 24

Used to connect two parallel shafts

Question 25

What are bevel gears

Answer 25

When the drive shaft and rivet shaft are not parallel

Question 26

What are worm gears

Answer 26

Needed when an extreme amount of mechanical advantage is needed. Spiral ridge around a shaft for the drive gear.

Question 27

What are planetary gear systems

Answer 27

Reduce the propeller shaft speed on mor powerful aircraft engines.

Question 28

How do we calculate efficiency

Answer 28

Using mechanical advantage.

Work output / work input x 100%