Question 1
FTwo students use the ruler-drop test to measure reaction time.
Student A holds a ruler vertically. Student B places her thumb and first finger on either side of the zero mark at the bottom of the ruler, without touching it.
Student A lets go of the ruler without warning. Student B catches the ruler as quickly as she can.
The Figure shows the apparatus.
Figure
The Table shows Student B's results.
Table
| Attempt | Distance the ruler falls in cm\text{cm}cm |
|---|---|
| 1 | 18 |
| 2 | 23 |
| 3 | 19 |
a.[2]
Calculate the mean distance the ruler falls.
b.[1]
Explain why Student A lets go of the ruler without warning.
c.[2]
Give two variables the students should keep the same in each attempt.
d.[2]
Student B repeats the test while talking on her mobile phone.
Predict how her reaction time changes. Give a reason for your answer.
8.1 Physics on the move Questions
50 exam-style questions on OCR GCSE Physics 8.1 Physics on the move, covering 8.1.1 Typical everyday speeds, 8.1.2 Typical everyday accelerations, 8.1.3 Ratios, units and rates on the road, 8.1.4 Human reaction times, 8.1.5 Factors affecting stopping distance, 8.1.6 Stopping distances at different speeds, 8.1.7 Dangers of large decelerations, 8.1.8 Estimating forces in road situations, and 8.1.9 Estimating the effects of large accelerations. Each one has a worked solution and a mark scheme showing where the marks go.