Question 38 – Forces, movement, shape and momentum - Questions

State the principle of moments.

A student uses the principle of moments to determine the weight of a heavy sensor. This is the student's method:

She balances a uniform wooden rod of length $cm120\text{ cm}$ at its midpoint ( $cm60\text{ cm}$ ) on a pivot.
She hangs a lightweight plastic basket from the $cm15\text{ cm}$ mark on the rod.
She places the sensor inside the basket.
She hangs a $N1.8\text{ N}$ counterweight from the rod on the other side of the pivot.
She adjusts the position of the counterweight until the rod is perfectly balanced horizontally when the counterweight is suspended from the $cm95\text{ cm}$ mark.

A uniform 120 cm rod balanced horizontally on a pivot at the 60 cm mark. A plastic basket containing a sensor is suspended at the 15 cm mark on the left side of the pivot. A 1.8 N counterweight is suspended at the 95 cm mark on the right side of the pivot.

Describe how the student could use an electronic balance to check that the weight of the counterweight is $N1.8\text{ N}$ .

Suggest how the student could improve the precision of one of the distance measurements.

State the equation linking moment, force, and perpendicular distance from the pivot.

Use the principle of moments to calculate the force acting on the rod at the $cm15\text{ cm}$ mark.

Suggest a reason why the weight of the sensor will be different from the force calculated in part (iv).

State the principle of moments.

A student uses the principle of moments to determine the weight of a heavy sensor. This is the student's method:

She balances a uniform wooden rod of length $cm120\text{ cm}$ at its midpoint ( $cm60\text{ cm}$ ) on a pivot.
She hangs a lightweight plastic basket from the $cm15\text{ cm}$ mark on the rod.
She places the sensor inside the basket.
She hangs a $N1.8\text{ N}$ counterweight from the rod on the other side of the pivot.
She adjusts the position of the counterweight until the rod is perfectly balanced horizontally when the counterweight is suspended from the $cm95\text{ cm}$ mark.

Describe how the student could use an electronic balance to check that the weight of the counterweight is $N1.8\text{ N}$ .

Suggest how the student could improve the precision of one of the distance measurements.

State the equation linking moment, force, and perpendicular distance from the pivot.

Use the principle of moments to calculate the force acting on the rod at the $cm15\text{ cm}$ mark.

Suggest a reason why the weight of the sensor will be different from the force calculated in part (iv).

Forces, movement, shape and momentum

Question 32

Forces, movement, shape and momentum

Question 32

Forces, movement, shape and momentum

Question 32

Forces, movement, shape and momentum Questions

Forces, movement, shape and momentum

Question 32

Forces, movement, shape and momentum Questions