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2 Motion and forces

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Question 89
H

A student measures her reaction time using a ruler.

Her partner holds a ruler vertically, with the zero mark level with the top of the student's thumb. The partner releases the ruler without warning and the student catches it.

The Figure shows the ruler just after it is caught.

Figure

image

The ruler accelerates from rest at 10 m/s2.

a.

Give the distance the ruler falls, in metres.

[1]
b.

Calculate the speed of the ruler when it is caught.

Use the equation

v2−u2=2×a×xv^2 - u^2 = 2 \times a \times xv2−u2=2×a×x

[3]
c.

Calculate the reaction time of the student.

[2]
d.

The student repeats the test while talking on a phone. The ruler falls 45 cm before she catches it.

Show that her reaction time increases by 50%.

[3]
Markscheme

2 Motion and forces Questions

  1. GCSE
  2. /Physics
  3. /2 Motion and forces

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