Reaction forces

Instructions: answer the questions, check them carefully, and when you are sure they are all right, press submit. The number of correct answers will be displayed.

Question 1: A car is driving at constant speed on a motorway. The resultant force on the car is:

Question 2: When an insect hits the windscreen of a car, which experiences the greatest force?

Question 3: What happens when we step off the front of a skateboard?

Question 4: When we inflate a balloon and release it, what causes it to fly forward?

Question 5: A taikonaut needs to move to her space capsule when her tether rope breaks. She throws her toolbox, which is a quarter of her mass, at 2 m/s away from the capsule. What happens?

Question 6: Why can't propellers be used in space, but jet engines can be?

Question 7: Which accident is more dangerous for the passengers in a car: a) a car hits a wall at 100km/h, or b) a car travelling at 100 km/h hits another car coming in the opposite direction, also at 100 km/h?

Question 8: A 50-kg boy sits on a 10-kg chair. What are the action-reaction force pairs involved?

Question 9: A 60-kg woman and her 30-kg daughter get into a lift. The woman tells her daughter she feels 6.0 kg heavier. How much increase in weight does the girl experience?

Question 10: Approximately how many g-force do you experience on a loop-the-loop (vertical loop) during a roller coaster ride?

Question 11: An ice-berg is in the way of the Titanic II ship, so the captain orders the part above the water to be removed. If this were possible, the...