Question 9 – Materials - AQA A Level Physics Questions

A student sets up an acrylic strip of rectangular cross-section clamped at one end as a horizontal cantilever. A mass $m$ is suspended from its free end, resulting in a vertical deflection $y$ .

A vertical pointer is attached to the free end of the strip, and its position is read using a vertical millimeter scale clamped behind it.

Explain a procedure, using a method such as a plane mirror or a set-square, to avoid parallax error when judging the reading indicated by the position of the pointer on the scale.

The theoretical relationship for the deflection $y$ is given by:

\frac{4gmL^3}{Ewt^3}

where:

$L$ is the cantilever length (the distance between the clamped end and the point where the mass is suspended),
$w$ is the width of the strip (approximately $cm2.0\text{ cm}$ ),
$t$ is the thickness of the strip (approximately $mm2.0\text{ mm}$ ),
$E$ is the Young modulus of the acrylic,
$g$ is the acceleration due to gravity.

A student is asked to determine $E$ using this arrangement with the following guidelines:

Only one acrylic strip of total length approximately $cm50\text{ cm}$ is available.
The mass $m$ must be made using a $g100\text{ g}$ mass hanger and up to four additional $g100\text{ g}$ slotted masses.
The experimental procedure must involve only one independent variable.
A graphical method must be used to determine $E$ .

Explain what the student must do to determine $E$ .

A student sets up an acrylic strip of rectangular cross-section clamped at one end as a horizontal cantilever. A mass $m$ is suspended from its free end, resulting in a vertical deflection $y$ .

A vertical pointer is attached to the free end of the strip, and its position is read using a vertical millimeter scale clamped behind it.

Explain a procedure, using a method such as a plane mirror or a set-square, to avoid parallax error when judging the reading indicated by the position of the pointer on the scale.

The theoretical relationship for the deflection $y$ is given by:

\frac{4gmL^3}{Ewt^3}

where:

$L$ is the cantilever length (the distance between the clamped end and the point where the mass is suspended),
$w$ is the width of the strip (approximately $cm2.0\text{ cm}$ ),
$t$ is the thickness of the strip (approximately $mm2.0\text{ mm}$ ),
$E$ is the Young modulus of the acrylic,
$g$ is the acceleration due to gravity.

A student is asked to determine $E$ using this arrangement with the following guidelines:

Only one acrylic strip of total length approximately $cm50\text{ cm}$ is available.
The mass $m$ must be made using a $g100\text{ g}$ mass hanger and up to four additional $g100\text{ g}$ slotted masses.
The experimental procedure must involve only one independent variable.
A graphical method must be used to determine $E$ .

Explain what the student must do to determine $E$ .

Materials

Question 1

Materials

Question 1

Materials

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Materials Questions

Materials

Question 1

Materials Questions