To calculate the tension in the string for the teddy bear, we can use the formula T = mg + ma, where T is the tension, m is the mass of the bear, g is the acceleration due to gravity (9.8 m/s^2), and a is the acceleration of the bear.
Yes, the unit for tension is Newtons (N), which is a unit of force. This is the same unit that is given for the weight of the teddy bear (2.5N).
The angles given (30º and 40º) represent the angle at which the string is being pulled. The greater the angle, the greater the tension in the string will be. This is because the force being applied by the string will have a vertical and horizontal component, and the vertical component will increase with a greater angle, resulting in a higher tension.
No, tension cannot be negative. It is a force that is always directed away from the object it is acting on. If the calculated tension is negative, it means there is an error in the calculation or the given values.
Yes, the mass of the teddy bear and the acceleration of the bear can also affect the tension in the string. A heavier bear or a greater acceleration will result in a higher tension. Additionally, external forces such as air resistance or friction can also impact the tension in the string.