Do an experiment with an air-cushion guide device to explore the relationship between constant force work and the change of kinetic energy of an object (as shown in figure 1). Adjust the air cushion g

Do an experiment with an air-cushion guide device to explore the relationship between constant force work and the change of kinetic energy of an object (as shown in figure 1). Adjust the air cushion guide rail horizontally and slide the research object. (1) Let the tension on the rope be f, and according to Newton's second law, there are:

F=Ma ①

For sand bucket and sand: mg-F=ma? ②

F = mgmm+m = mg 1+mm, which shows that when m > > m, the gravity of sand and sand bucket is equal to the tension of rope.

So the answer is: m "m.

(2) The width d of the light blocking bar is very small, and the light blocking time is very short, so the average speed can replace the instantaneous speed, so the instantaneous speed of the slider passing through the photoelectric gate is: v = d △ t. 。

So the answer is: d △ t.

(3) If the decrease of gravitational potential energy is △EP=mgs and the increase of kinetic energy is △ Ek= 12M(d△t)2, the relationship to be verified is △ MGS = 12m (d △ t) 2.

So the answer is: MGS = 12m (d △ t) 2.

(4) When the object starts to move from zero initial velocity, according to the kinetic energy theorem, there is MGS = 12mv2, so there is v2=2gs, so v2-S looks like a straight line passing through the origin, as shown in the following figure: