Mrs McKnight Physics

Question 1

What is the equation for momentum

Answer 1

Momentum = mass x velocity

Question 2

What is the difference between an Elastic and Inelastic collision

Answer 2

In an Elastic collision KE is conserved while in an Inelastic collision KE isn’t conserved

Question 3

What is the full equation of Impulse

Answer 3

Impulse = (mass)(final momentum) - (mass)(initial momentum) = Force x time

Question 4

Define the principle of conservation of momentum

Answer 4

The total initial momentum must equal the total final momentum

Question 5

Define Work Done

Answer 5

The force applied times the distance in one direction
(W.d = F x D)

Question 6

What are the equations for:
1)GPE(Gravitational potential energy)
2)KE (Kinetic Energy)

Answer 6

GPE = Mass x gravity x height
KE = 1/2 x mass x velocity^2

Question 7

What is the equation for Power

Answer 7

Power = Work Done / Time

Question 8

What is the arc of a projectile called

Answer 8

A Parabola

Question 9

What do you use to work out:
1) Vertical Motion
2) Horizontal Motion

Answer 9

1) Use equations of motion
2) Speed = Distance / Time

Question 10

What are the equations of motion

Answer 10

1) V = u + at
2)V² = u² + 2as
3)S = ut + ½at²
4)S = ½t(u + v)

Question 11

What is the experiment to find Acceleration due to gravity

Answer 11

A ball / object is dropped from a point x metres above the ground and then its timed from when its dropped to when it hits the ground, then equations of motion are used to find the acceleration

Question 12

How would the acceleration due to gravity experiment be improved

Answer 12

1) Light gates can be used to remove the human error in timing the drop of the ball
2) the experiment can be repeated for reliablity and to make an average

Question 13

What is the equation of moments

Answer 13

1) CM = ACM
2) F1 x D1 = F2 x D2

Question 14

What is unique about a beam at the point of toppling

Answer 14

One of the reactive forces is = 0

Question 15

State the principle of moments

Answer 15

When in equilibrium, the sum of the clockwise moments is equal to the sum of the anti-clockwise about the same pivot

Question 16

What is the standard form of the prefix pico

Answer 16

1x10^-12

Question 17

What is the standard form of the prefix nano

Answer 17

1x10^-9

Question 18

What is the standard form of the prefix micro

Answer 18

1x10^-6

Question 19

What is the standard form of the prefix milli

Answer 19

1x10^-3

Question 20

What is the standard form of the prefix centi

Answer 20

1x10^-2

Question 21

What is the standard form of the prefix deci

Answer 21

1x10^-1

Question 22

What is the standard form of the prefix Kilo

Answer 22

1x10^3

Question 23

What is the standard form of the prefix Mega

Answer 23

1x10^6

Question 24

What is the standard form of the prefix Giga

Answer 24

1x10^9

Question 25

What is the **standard form** of the prefix **Tera**

Answer 25

1x10^12

Question 26

What are the SI **base** units

Answer 26

1) Kilograms (Mass) 2) Metre (Length) 3) Seconds (Time) 4) Amps / Ampere (Current) 5) Kelvin (Temperature 6) Mole (Amount of substance)

Question 27

What is the difference between an **SI unit/ derived unit** and an **SI base unit**

Answer 27

An SI base unit is a unit which all other units are derived from and a derived unit is a unit derived from an SI base unit

Question 28

What is a **vector** quantity

Answer 28

Its a quantity that has both **magnitude** and **direction**

Question 29

What is a **Scalar** quantity

Answer 29

It is a quantity that has a **magnitude** but **no direction**

Question 30

How to find the **resultant force** and **angle to the horizontal** of 2 vectors

Answer 30

Create a nose to tail diagram and do pythegoras (**R = √A^2 + B^2**) and for the angle use trig (tanθ = A / B)

Question 31

What does it mean for an object to be in **equilibrium**

Answer 31

This means that all the forces acting upon it are **balanced** / there is **no resultant force**

Question 32

How do you find the **resultant force** and **angle to the horizontal** of an object with **3 or more vectors**

Answer 32

Firstly you resolve the angled forces, then you decide which directions are positive through sign convention, then take the opposing forces away from eachother, then make a nose to tail diagram and use pythegoras and trig

Question 33

State **Newton's First Law**

Answer 33

An object in a state of rest or constant uniform motion unless acted upon by a **resultant force**

Question 34

State **Newton's Second Law**

Answer 34

The **acceleration** of an object is **directly proportional** to the **resultant force** in the **same direction** and **inversely propotional** to the **mass** of the object

Question 35

State **Newton's Third Law**

Answer 35

If object A exerts a force on object B, then object B will exert an equal and opposite force on object A

Question 36

What are the variables that affect the **drag force**

Answer 36

1) Shape of the object 2) Speed 3) Viscosity of the fluid

Question 37

What is **terminal velocity

Answer 37

It is the maximum possible velocity attainable by an object falling through a fluid / gas (e.g water, air)