Lecture 1

Question 1

When an ….. object catches a ……object, the accelerating object will be moving at twice that velocity.

Answer 1

Accelerating, constant velocity

Question 2

In u……… acceleration the chaser always reachers twice the velocity of the constant velocity object.

Answer 2

Uniform

Question 3

What only measures how fast an object is moving (magnitude)? it is a scalar quantity?

Answer 3

Speed

Question 4

What is a vector quantity (includes both magnitude and direction)?

Answer 4

Velocity

Question 5

What is a carefully defined amount of something?

Answer 5

Unit

Question 6

What is defined as the amount of time it takes for Caesium-133 atom to oscillate between electrons states 9,192,631,770 times.

Answer 6

Second

Question 7

What WAS defined as the mass of a certain platinum-iridium cylinder held in a vault near Paris

Answer 7

The kilogram

Question 8

What was the kilogram defined as?

Answer 8

The mass of a certain platinum iridium cylinder held in a vault near Paris.

Question 9

what is the second defined as?

Answer 9

the amount of time it takes for Caesium-133 atom to oscillate between electrons states 9,192,631,770 times

Question 10

What is blood pressure measured in?

Answer 10

mmHg (milligrams of mercury)

Question 11

What is atmospheric pressure measured in?

Answer 11

kPa (Kilopascal)

Question 12

Can blood pressure and atmospheric pressure be compared?

Answer 12

Not with their current units (because they are completely different measures). However, you can compare if you convert the units.

Question 13

what are the units for LENGTH?

Answer 13

metres - m

Question 14

What are the units for TIME?

Answer 14

Second - s

Question 15

What are the units for MASS?

Answer 15

Kilogram - kg

Question 16

What are the units for CURRENT?

Answer 16

Ampere - A

Question 17

What are the units for TEMPERATURE?

Answer 17

Kelvin - K

Question 18

What are the units for the amount of substance?

Answer 18

The mole - mol

Question 19

What are the units for LUMINOSITY?

Answer 19

The candela - cd

Question 20

The units of which quantities are called the fundamental units?

Answer 20

Length, time , mass, current, temperature, amount of substance, and luminosity.

Question 21

The units of all OTHER measurable quantities may be constructed by combing …..

Answer 21

Fundamental units

Question 22

Defining a set of fundamental units defines a system of units. What is the system called?

Answer 22

The SI system of units (there are others e.g. cgc etc.)

Question 23

1 N = ?( Using SI units)

Answer 23

1 kg ms-2

Question 24

F = Av
A= cross sectional area
V= velocity

what is the SI units of F (the volume flow rate)?

Answer 24

m^3 s-1

Question 25

Constant speed and constant velocity are not the same in uniform acceleration? explain why?

Answer 25

Constant velocity implies zero acceleration (meaning uniform acceleration of zero), constant speed alone does not necessarily mean zero acceleration as the direction of motion could still be changing, leading to acceleration even if the speed remains the same.

Question 26

What does acceleration require?

Answer 26

acceleration requires a change in velocity over time, meaning an object must either speed up, slow down, or change direction to be considered accelerating.

Question 27

what does content velocity mean?

Answer 27

I means that the speed and direction of the object remain unchanged. Therefore there is zero acceleration

Question 28

What does constant speed mean

Answer 28

it means that the speed of the object remains unchanged but, direction can still change. Therefore acceleration could still exist.

Question 29

Can there be acceleration when there is constant velocity?

Answer 29

no

Question 30

Can there be acceleration when there is constant speed

Answer 30

Yes