11. Every object is surrounded by a gravitational field. a) The unit of gravitational field strength g is newtons per kilogram. Explain how the unit of gravitational field strength relates to the unit of force. [2 marks] 9 = f Ine unit of gravitational field Strength, neutons Per kilogram, directing relates to the unit of force (N) by indicating the gravitational force experienced, ly ce Unit mass (up) in a given flavitation b) How does g vary with distance? How does it vary with the object's mass? [2 marks] field. of decreases as you move farther from a mass, y is directly Proportional to the mass creating the gravitational field. carger masses will Produce Stronger gravitational fields.c) Describe the direction of the gravitational field around a spherical object. [2 marks] The gravitational field around a Spherical owjet are is radial and points towards the centre of mm 's 3 ) an object. uni ces igh 12. A student rubs a balloon against her hair. She then places the side of the balloon against a les wall and the balloon sticks to the wall. ti a) Explain why the balloon sticks to the wall. [2 marks] This action involves the triboelectric effect. (this effect Pertains to the trans fer of e between two different materials upon contact). e transfer from hair to balloon, giving it negative Charge. Putting balloon near walls surface induces a positive charge. inc charged balloonis then attracted to the Positive Charged wall, causing it to stick. b) If the balloon is turned around so the other side touches the wall, will the balloon stick to the wall? Justify your answer. [2 marks] The balloon will stick to wall when turned Wround. The charge on the balloon, after being rubbed against the hair Is distributed over it's Surface. so even if balloon is turned around, the overall negative charge still remains