P2.1. 1-3

Question 1

Formula for distance speed and time

Answer 1

Distance = Speed x Time

Question 2

Explain what the Light Gate is

Answer 2

Used for timing experiments, a type of sensor (digital switch type)
It has a timer which starts and stops when objects passes through light beam

Question 3

What can distance be measured with?

Answer 3

Ultrasound - high frequency sound waves

Question 4

What affects manually keeping time via stopwatches?

Answer 4

• human reaction time adding on average of 0.25 seconds
• mechanism of watch itself
• starting watch too early/late

Question 5

Scalar

Answer 5

Quantity, can be measured, ONLY magnitude

Question 6

Vector

Answer 6

Quantity, represented by arrow BOTH magnitude and direction
Arrow’s length is magnitude and arrow pointing shows direction

Question 7

List some scalars (4-6)

Answer 7

• Time
• Speed
• Energy
• Mass
• Distance
• Density

Question 8

List some vectors (4-6)

Answer 8

• Force
• Velocity
• Weight
• Displacement
• Acceleration
• Momentum

Question 9

Difference between distance and displacement

Answer 9

Distance: actual length or path taken to get from Point A to Point B
Displacement: not necessarily taken route, but simply starts at Point A, end at Point B

Question 10

Is speed and velocity either a scalar or vector? Explain why

Answer 10

Speed - Scalar, since it measures speed (15m/s)
Velocity - Vector since it accounts for direction as well (15m/s south)

Question 11

Define acceleration

Answer 11

How quick change in velocity occurs
Or rate at which object changes speed

Question 12

Formula for acceleration

Answer 12

Change in velocity (final - initial / v - u) [m/s]
Divided by time taken [s] (t for time)

Question 13

How does + or - affect velocity?

Answer 13

It shows direction of motion
+ means it is speeding up
- means it is slowing down
» Better to say negative acceleration than deceleration since it is not a vector