A girl uses a spanner of length 20cm to tighten a nut. If she pulls at right angles to the end of the spanner with a force of 50N,calculate the moment of her pull
To calculate the moment of her pull, we need to first understand what moment is. The moment of a force, also known as torque, measures the turning effect of a force about a certain point. It depends on the magnitude of the force and its perpendicular distance from the point of rotation.
In this case, the girl is applying a force of 50N and pulling at right angles to the end of the spanner. The perpendicular distance from the point of rotation (which is the center of the nut) is the length of the spanner, which is 20cm.
To calculate the moment, we use the formula:
Moment = Force * Perpendicular Distance
Here's how you can calculate it:
1. Convert the length of the spanner to meters, as the formula requires the distance to be in meters. 20cm is equal to 0.20m.
2. Substitute the converted values into the formula:
Moment = 50N * 0.20m
3. Calculate the product:
Moment = 10 N.m
Therefore, the moment of her pull is 10 N.m (newton-meters).