Things To Be Armed With

Question 1

Physics :

What is the definition of 1 Volt ?

Answer 1

1 Volt = I Joule / 1 Coulomb

“I Volt = 1 Joule per Coulomb”

Question 2

Physics :

What is the law of conservation of linear momentum ?

Answer 2

Momentum before a collision/explosion etc Is EQUAL To the Momentum after a collision

IN THE ABSENCE OF ANY EXTERNAL FORCES

Question 3

Physics :

What is the difference between a vector and a scalar ?

Answer 3

A scalar requires Magnitude only

A vector requires Magnitude + DIRECTION

Question 4

Physics : 
In a Velocity-Time Graph, what is the:
1. gradient
2.Displacement 
Equal to

Answer 4

1. Gradient = Acceleration

2. Displacement = Area under graph

Question 5

Physics: 
In a Displacement-Time graph, what is:
1. gradient 
2. A straight line 
Equal to?

Answer 5

1. Gradient = Velocity

2. Str. line = Constant Velocity

Question 6

Physics:

what are the 3 equations of Motion?

Answer 6

1. V = u + at
2. V^2 = u^2 + 2as
3. S = ut + 1/2 a t^2

Question 7

Physics :
what is meant by the terms

1. EMF ?
2. Tpd
3. Lv

Answer 7

EMF = Electro Motive Force
(Voltage Supply)

Tpd = Terminal Potential Difference

Lv = Lost Volts

Question 8

Physics :

If a battery has an internal resistance connected to it and there is no current flowing through the circuit, is there any lost volts ?

Answer 8

No,

Lost Volts = (Current x Internal Resistance)

If current = 0A there is no lost volts

Question 9

Physics :

What happens to a circuit with internal resistance when the switch is closed (I.e. When a current flows through)

Answer 9

When current flows through a circuit with internal resistance:

Lost volts will occur, can be calculated by (Ir)
As soon as there is Lost Volts from:
EMF = Tpd + Lv

The Tpd will decrease

Question 10

Physics :

What is “Short Circuit Current” ?

Answer 10

Short Circuit current is:

the Max current available from the pier supply

Short Circuit Current Is dangerous!!

Question 11

Physics :

When doing UVAST, when a projectile reaches its maximum height what is V equal to ?

Answer 11

V is equal to 0 m/s

Question 12

Physics :

If a projectile is thrown and lands under the height at which is was thrown from, what does this mean?

Answer 12

This means the projectile had a negative displacement, as:

Is has traveled a distance from its starting point but in the opposite direction

Question 13

Physics :

When doing Doppler Effect questions, what alternative to the equation do you use when the source is travelling

1. Towards
2. Away

Answer 13

1. Vs - Vo

2. Vs + Vo

Question 14

Physics :

What is the change in momentum of an object ?

Answer 14

If 2 objects are traveling in opposite directions then one of their velocities must be considered to be negative!!!!

Question 15

Are the following quantities Scalars or Vectors ?

1. speed
2. Displacement
3. Acceleration
4. Force
5. Momentum

Answer 15

1. Scalar
2. Vector
3. Vector
   4.