# Required practicals 🔬🧬🧪 Flashcards

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1
Q

What’s the required practical, to investigate reaction-time ? ⏰ [6]

A

1) person 1 sits on a stool with a good upright posture and then places the forearm of their dominant arm, across the table, with their hand overhanging the edge.

2) person 2 must now hold the ruler vertically, and the 0cm mark should be between person 1’s thumb and first finger.

3) person 2 should randomly drop the ruler [at a random time] and person 1 has to catch the ruler with their thumb and first finger, as quickly as possible when it drops.

4) person 2 records the measurement on the ruler, that’s level with the top of person 1’s thumb

5) and now repeat the test several times and calculate a mean. Then record results and use an online conversion table

6) and when done, repeat the experiment with the two people switching places

2
Q

Describe the set up, for the reaction time practical ⏰

A
• firstly two people must work together- person one and two. [person two measures the reaction time of person one]
3
Q

Why is a conversion table used ? ⏰

A
• and now repeat the test several times and calculate a mean. Then record results and use an online conversion table.
• in this step, a conversion table is used to convert the results into a reaction time.
4
Q

After the practical is done, why should the two people swap places ? ⏰

A
• and when done, repeat the experiment with the two people switching places- swapping places, allows us to see whether two people have different reaction times.
5
Q

What’s the three variables in the ruler drop test ? ⏰

A
• independent variable- the person having their reaction time tested.
• dependent variable- the reaction time
• control variable- the starting distance bewteen the thumb and the first finger, should be kept constant
6
Q

What are all the control variables in the ruler drop test ? ⏰

A
• control variable- the starting distance bewteen the thumb and the first finger, should be kept constant
• and the ruler at the top of the thumb, should always be measured.
• ; the conditions in the room should be kept the same [level of background noise and lighting]
7
Q

What’s steps one to two of the required practical, to investigate reaction-time? ⏰

A

1) person 1 sits on a stool with a good upright posture and then places the forearm of their dominant arm, across the table, with their hand overhanging the edge.

2) person 2 must now hold the ruler vertically, and the 0cm mark should be between person 1’s thumb and first finger.

8
Q

What’s steps three to four of the required practical, to investigate reaction-time? ⏰

A

3) person 2 should randomly drop the ruler [at a random time] and person 1 has to catch the ruler with their thumb and first finger, as quickly as possible when it drops.

4) person 2 records the measurement on the ruler, that’s level with the top of person 1’s thumb

9
Q

What’s steps five to six of the required practical, to investigate reaction-time? ⏰

A

5) and now repeat the test several times and calculate a mean. Then record results and use an online conversion table

6) and when done, repeat the experiment with the two people switching places

10
Q

When doing the reaction-time practical, what other independent variables, could we investigate ? ⏰

A
• the effect of practise [on reaction time]
• the effect of the hand, catching the ruler [on reaction time]
• the effect of certain chemicals [on reaction-time]
11
Q

If we were to investigate the effect of practise on reaction time, what would we do ? ⏰

A
• one person would catch the ruler a large number of times.
• and we would then look to see if the reaction time changes, depending on the number of tries.
12
Q

If we were to investigate the effect of hands [a dominant hand] on reaction time, what would we do ? ⏰

A
• firstly carry out the test with the person’s dominant hand, and then carry it out with the non-dominant hand of the person.
• it could be expected, that the reaction-time is shorter with the dominant hand, compared to the non-dominant hand.
13
Q

If we were to investigate the effect of chemicals on reaction time, what would we do ? ⏰ [4]

A
• the test subject could drink a measured amount of cola, half an hour before the experiment.
• this would then be compared with their normal reaction time
14
Q

What problems could be encountered, when investigating the effect of chemicals on reaction time, what would we do ? ⏰ [2]

A
• ; since there could be another chemical in the cola affecting reaction times, we would have to carry out the test using a caffeine-free cola
• this reaction time, would then be compared with their normal reaction time
15
Q

What problems could be encountered, when investigating the effect of chemicals on reaction time, what would we do ? ⏰ [1]

A
• and we should also check that they have no medical issue, which could be affected by caffeine [e.g- allergies or a heart condition]
16
Q

What problems could be encountered, when investigating the effect of chemicals on reaction time, what would we do ? ⏰ [1]

A
• carry out the test in a lab, where hazardous chemicals aren’t normally used.