Physics

Question 1

What does a scalar quantity have and not have

Answer 1

Has Magnitude but does not have any specific direction

Question 2

What does a vector quantity have and not have

Answer 2

Has both magnitude and a specific direction

Question 3

What are some vector and scalar quantities

Answer 3

Displacement/distance
Acceleration
Velocity/speed
Force
Weight/mass
Momentum
Energy

Question 4

What is velocity

Answer 4

Velocity is speed in a stated direction

Question 5

What is the speed equation

Answer 5

Speed (m/s) = Distance (m) / time (s)

Question 6

What is the distance traveled equation

Answer 6

Average speed (m/s) x Time (s)

Question 7

How can speed be determined

Answer 7

By analysis of the gradient of distance/time graphs

Question 8

what is used to determine the speed of objects in a laboratory

Answer 8

A range of methods such as light gates

Question 9

What is the typical speed for walking

Answer 9

2.5-4 mph

Question 10

What is the typical speed for wind

Answer 10

about 12 m/s

Question 11

What is the typical speed for sound

Answer 11

331 m/s

Question 12

what does Newtons first law of motion describe

Answer 12

The effect of balanced and unbalanced G-forces on an object in the following situations:
Where the resultant force on a body is zero i.e. the body is moving at a constant velocity or is at rest
Where the resultant force is not zero i.e. the speed and or direction of the body changes

Question 13

What equation is weight defined by

Answer 13

Weight = mass (kg) X Gravitational field strength

Question 14

What is weight

Answer 14

A force which is correctly measure in newtons

Question 15

There is a relationship between the weight of a body and the gravitational field strength
True or False?

Answer 15

True

Question 16

What is gravitational strength affected by

Answer 16

Distance

Question 17

What do energy diagrams represent

Answer 17

Energy transfers

Question 18

Can energy be created or destroyed

Answer 18

No

Question 19

What are the different ways energy can be transferred in

Answer 19

An object can be projected upwards or up a slope
A moving object hitting an obstacle
An object being accelerated by a constant force
A vehicle slowing down

Question 20

Where there are energy transfers in a closed system there is no what

Answer 20

Change to the total energy in that system

Question 21

In all system changes energy is dissipated so that it is…

Answer 21

Stored in less useful ways

Question 22

When do mechanical processes become wasteful

Answer 22

When they cause a rise in temperature so dissipating energy in heating the surroundings

Question 23

What do waves transfer

Answer 23

energy and information without transferring matter

Question 24

What is the efficiency equation

Answer 24

efficiency = useful energy transferred by the device / total energy supplied to the device

Question 25

How can efficiency be increased

Answer 25

By minimising unwanted energy transfers

Question 26

How can waves be described

Answer 26

By the use of terms, amplitude period and wave velocity

Question 27

Is there a difference between longitudital and transverse wave

Answer 27

Yes there is

Question 28

What do waves transfer

Answer 28

Energy and information without transferring matter

Question 29

What is the wave speed equation

Answer 29

Wave speed (m/s) = frequency (Hz) X wavelength
Wave speed (m/s) = distance (m) / Time (s)

Question 30

INFO: There are different methods to measure the velocity of sound in air and ripples on water surface

Question 31

What can reflection, refraction and total internal reflection be described with

Answer 31

Ray diagrams

Question 32

INFO: there is a difference between specular and diffuse reflection

Question 33

What type of waves are electromagnetic

Answer 33

Transverse

Question 34

What do all electromagnetic waves transfer

Answer 34

Energy from source to observer

Question 35

What is the order of the electromagnetic spectrum - longest wavelength-shortest

Answer 35

Radio waves, microwaves, infrared, visible, ultraviolet, X-rays and gamma rays