moments physics a alevel

So if the angle is basically not perpendicular, then the perpendicular distance, or the distance along the line of action decreases. And since moments = force x distance, then smaller distance, smaller moment. The force doesnt necessarily change, cos that depends on the person applying the force. We can think of the force as constant in this case.

thank you! so essentially if the angle were to increase the perpendicular distance would also increase so a larger moment?

The moment is
m = d*f*sin(theta)
where d is the distance that a force f is applied and theta is the angle between them. So for a fixed distance and force, if sin(theta) increases (theta moves towards 90 degrees), then the moment will increase. Thinking about
* perpendicular force: f*sin(theta)
* perpendicular distance: d*sin(theta)
is just associating the trig term with either term. Either is appropriate, or just consider the 3 terms independently.