Mechanics

Question 1

What is the Symbol and Units of Displacement?

Answer 1

Symbol: S
Units: m

Question 2

What is the Symbol and Units of Initial Velocity?

Answer 2

Symbol: u
Units: ms^-1

Question 3

What is the Symbol and Units of Final Velocity?

Answer 3

Symbol: v
Units: ms^-1

Question 4

What is the Symbol and Units of Acceleration?

Answer 4

Symbol: a
Units: ms^-2

Question 5

What is the Symbol and Units of Time?

Answer 5

Symbol: t
Units: s

Question 6

What is the gradient of a Displacement-Time graph?

Answer 6

Velocity

Question 7

What is the gradient of a Velocity-Time graph?

Answer 7

Acceleration

Question 8

What is the area of a Velocity-Time graph?

Answer 8

Displacement

Question 9

What is the area under an Acceleration-Time graph?

Answer 9

Velocity

Question 10

What are the five SUVAT equations?

Answer 10

v = u+at
s = vt-0.5at²
s = ut+0.5at²
s = t(u+v)/2
v² = u²+2as

Question 11

When are SUVAT equations applicable?

Answer 11

When the acceleration is constant

Question 12

What is Projectile Motion?

Answer 12

It is a simplified way to understand and calculate the motion of an object.
It models horizontal and vertical motion as independent

Question 13

What is assumed with Projectile Motion?

Answer 13

Air ressistance is ignored
It is in a uniform field
The initial velocity is imparted instantaneously
Vertical and horizontal motion is independent

Question 14

What is Newton’s First Law of Motion?

Answer 14

An object will remain at rest or continue to move with a constant velocity, unless acted upon by a resultant force.

Question 15

What is the Resultant Force?

Answer 15

The Overall force acting upon an object

Question 16

What is Newton’s Second Law of Motion?

Answer 16

The force acting on an object is product of the mass and the acceleration

Question 17

What is Newton’s Second Law of Motion as an equation?

Answer 17

F = ma

Question 18

What is Newton’s Third Law of Motion?

Answer 18

Every action has an equal and opposite reaction acting upon a different object.

Question 19

When is Newton’s Third Law of Motion true?

Answer 19

It is true for all situations

Not just equilibrium

Question 20

What is Terminal Velocity?

Answer 20

It is the constant speed reach in free fall

Question 21

When is Terminal Velocity reached?

Answer 21

When Weight = Ressistance

Question 22

What is the equation the links Work Done, Force and Displacement?

Answer 22

Work Done = Force x Displacement in direction of the force

w = Fs

Question 23

Is Work Done Scalar or Vector?

Answer 23

Scalar

Question 24

What is the equation for Kinetic Energy?

Answer 24

Energy = 0.5 x Mass x Velocity²
E = 0.5mv²

Question 25

What is Kinetic Energy proportional to?

Answer 25

E ∝ m | E ∝ v²

Question 26

What is the equation for change in Gravitational Potential Energy?

Answer 26

``` Energy = Mass x Gravitaional Field Strength x Change in height E = mgΔh ```

Question 27

Define Power?

Answer 27

The rate of work done Or The rate of energy transfer

Question 28

What is the Symbol and Units of Power?

Answer 28

Symbol: P Units: W

Question 29

What is the equation that links Power, Force and Velocity?

Answer 29

``` Power = Force x Velocity P = fv ```

Question 30

What is the equation that links Power, Work Done and Time?

Answer 30

P = w/t

Question 31

Define Efficiency?

Answer 31

The ration of Useful Output Power to Total Input Power

Question 32

What is the equation of Efficiency?

Answer 32

(Useful Output Power / Input Power) x 100 Or (Useful Output Energy / Input Energy) x 100

Question 33

What is the equation for Momentum?

Answer 33

``` Momentum = Mass x Velocity p = mv ``` ``` Momentum = Force x Time p = Ft ```

Question 34

What is the Symbol and Units of Momentum?

Answer 34

Symbol: p Units: Ns

Question 35

What is an Elastic Collision?

Answer 35

A collision where no energy is lost

Question 36

What is an Inelastic Collision?

Answer 36

A collision where energy is lost

Question 37

What is Change in Momentum?

Answer 37

Impluse

Question 38

What are the equations for Impulse?

Answer 38

Change in Momentum = Force x Change in Time Δp = FΔt Change in Momentum = Mass x Change in Velocity Δp = mΔv

Question 39

What is the area under a Force-Time graph?

Answer 39

Impulse

Question 40

For an object to be in Static Equilibrium it has to what?

Answer 40

Have no resultant force | Therefore no acceleration

Question 41

What is the Moment of a Force?

Answer 41

The rotaional force acting on an object

Question 42

What is the Symbol and Units of Moment of Force?

Answer 42

Symbol: T Units: Nm

Question 43

What is the equation for calculating a Moment of a Force?

Answer 43

``` Moment = Force x Perperndicular distance between force and pivot T = Fm ```

Question 44

What does the Principle of Moments state?

Answer 44

If a body is in rotaional equilibrium, the total clockwise moment is equal to the total anticlockwise moment Σ↻ = Σ↺