On Earth,, so my weight is, nearly six times as big.Ģ) My weight in pounds is W = 185 lbs, converting to kg. Chapter 5ġ) On moon,, so if my mass m = 85kg, my weight is. Remember that the negative sign is simply telling me the direction of the force, down. My 'weight' is the force of gravity acting on me. Exercises:ĥ) The force pulling forward is, the force pulling back is which makes the net force, soġ0) My weight = 190lb, converting to mass, m (kg). Although the log is much more massive, it is still small enough that your force pushing backwards will cause it to move. In fact it is the log pushing back on you that propels you forward. This force is supplied by the engine which burns gasoline to work.ġ8) When you walk on a floating log, you are pushing backward on the log to propel yourself forward. It appears to whip back, but in fact it is remaining still(Newton's 1st Law - Law of Inertia).ġ2) Stopping and starting (acceleration) take more force (energy) than just maintaining a constant speed(Newton's 2nd Law - F = ma).

Your body will move forward, while your head remains (momentarily) in place. If you are hit from behind, the seat pushes on your back, but if you do not have a headrest, there is nothing pushing on your head. In order to accelerate around the curve, the door of the car (or seatbelt) pushes on you and causes you to accelerate.ĩ) The head wants to remain at rest. In order to move around a curve, you must change your direction of motion (i.e. The china and glassware want to remain at rest and by pulling quickly, the tablecloth can exert its friction on them for a very short time not enough for them to move.Ĩ) Your natural state of motion is a straight line(Newton's 1st Law - Law of Inertia).

When the wagon is pulled, the part of the body that is not touching the wagon will 'fall back', really just try and remain in place.ħ) Newton's 1st Law - Law of Inertia. The voyager space probe has left our solar system on its trip through deep space.Ĥ) The child is at rest and wants to remain at rest (Newton's 1st Law - Law of Inertia). In space this can be directly tested and has been tested many times. Unfortunately we are limited in how long the tube can be. This is Newton's 1 st Law.Ģ) On Earth, we can do very well and reduce friction (including air resistance) in a tube and see an object travel with constant velocity. An object will keep moving in straight-line motion unless acted upon by an external force. Homework Solutions Ch 4-8 Chapter4, Chapter5, Chapter6, Chapter7, Chapter8ġ) Yes.

Drops in the bucket homework