Kinetics

Question 1

What does XUVAT stand for?

Answer 1

x=displacement
u=initial velocity
v=final velocity
a=acceleration
t=time

Question 2

Equations of xuvat?

Answer 2

1) v= u + at
2) x= 1/2 * (u+v)t
3) x= ut + 1/2*at^2
4) v^2= u^2 + 2ax

Question 3

What is acceleration due to gravity?

Answer 3

9.81 m/s^2

Question 4

What are the two forces in rotational movement?

Answer 4

Centrifugal

Centripetal

Question 5

What is centrifugal force?

Answer 5

Centrifugal force pulls AWAY from the center

Question 6

What is centripetal force?

Answer 6

Centripetal force pulls TOWARDS the center

Question 7

Centripetal force equation

Answer 7

Centripetal force = (mv^2)/r

m=mass
v=velocity
r=radius

Question 8

What is the link between the centripetal force and radius?

Answer 8

The bigger the radius, the smaller the force

Question 9

What is the centripetal acceleration equation?

Answer 9

Centripetal acceleration = v^2/r

Question 10

What does a pendulum depend and not depend on?

Answer 10

Depends in the length of the string NOT on the mass

Question 11

What is the periodic time?

Answer 11

Time it takes to complete one oscillation

Question 12

What is damping?

Answer 12

The resistive force that slows down the swing/reduces the amplitude of the swing

Question 13

What forces can be used for damping

Answer 13

Air resistance

Friction

Question 14

What are the 2 types of vibrations

Answer 14

Free vibrations

Forced vibrations

Question 15

What is the definition of vibrations

Answer 15

The mechanical oscillations about an equilibrium force

Question 16

Velocity (speed) Ratio equation

Answer 16

Distance moved by effort / distance moved by load

Distance in/ distance out

Question 17

Ideal mechanical advantage equation

Answer 17

Distance in / distance out

Question 18

Actual mechanical advantage equation

Answer 18

Force out / force in

Question 19

Mechanical advantage equation

Answer 19

Resistance / effort

Question 20

How many classes of levers are there?

Answer 20

3 classes

Question 21

How do you calculate the effort in Levers?

Answer 21

L x E = R x l

L= length (effort arm)
E= effort
R= resistance
l= length (resistance arm)

Question 22

What is the difference between class 1 and 2 levers?

Answer 22

The position of the fulcrum on a class 1 lever leaves an arm on either side (see-saw)
Class 2 - the position of the fulcrum is on the edge of the lever (wheelbarrow)

Question 23

What is a class 3 lever ?

Answer 23

Class 3 levers are primarily used to move greater distances than effort applied. It applies the effort between the fulcrum and resistance

Question 24

On a pulley, if you have more supoorting ropes what does that mean for the Mechanical Adavantages?

Answer 24

More MA

Question 25

What types of gears are there?

Answer 25

Spur gears
Bevel gears
Worm gears
Sun+Planetary Gears

Question 26

Characteristic of a spur gear

Answer 26

Used to connect 2 parallel shaft

Question 27

Bevel gears characteristics

Answer 27

Drive shaft and driven shaft are not parallel

Question 28

Worm gear characteristics

Answer 28

Used when an extreme amount if mechanical advantage is needed

Question 29

Sun + planetary gear characteristics

Answer 29

Reduce propeller shaft speed on a more powerful engine

Question 30

What has more Mechanical Advantage - class 1 or. 2

Answer 30

Both have the same mechanical advantage

Question 31

2 equations for efficiency

Answer 31

Efficiency = work in / work out x 100

Efficiency = mechanical advantage / velocity ratio