Why does the trolley that slide down the inclined plane get faster 5

The reason why the trolley that slides down the inclined plane becomes faster is that the gravitational potential energy is converted into kinetic energy.

Introduction: Gravitational potential energy is the energy that an object has due to being lifted high. Kinetic energy is the energy that an object has due to motion. The energy between gravitational potential energy and kinetic energy can be converted into each other.

Because the trolley on the inclined plane, which has a certain height, has gravitational potential energy. When the object descends, the potential energy is converted into kinetic energy, so the kinetic energy increases. According to the formula for calculating kinetic energy:

e=1 2mv, when the mass of the car is constant, the kinetic energy increases, and the velocity increases, so the speed becomes faster.

There are only two forces along the inclined plane, one is the component of gravity along the inclined plane (this force is hypothetical) The other is the frictional force of the inclined surface to the trolley, the friction force is less than this component, that is, the resultant force of the trolley along the inclined plane is downward, so under the action of this resultant force, the trolley has a corresponding acceleration that is getting faster and faster. . .

Acceleration due to gravity!! Middle School Physics Questions. Because of the gravitational pull of the earth, gravitational acceleration is generated

Because of gravity... It's like your car has a vertical downward pull pulling force pulling it.

I can run because of the lack of friction...

As soon as you start running, you will get faster and faster, because of the acceleration.

I'm dizzy, I'll still use counter-evidence to illustrate ha.

If it wasn't fast, the apple wouldn't have hit Newton's head.

If it is not fast, the mortality rate of jumping off the building will be greatly reduced.

If it doesn't go fast, the pig can fly.

If it doesn't go fast, the stupid bird won't fly first.

This problem kills my n more brain cells.

The force of gravity in the direction of the inclined plane causes the trolley to accelerate.

Gravitational acceleration, brother, you went to high school.

Gravitational potential energy is converted into kinetic energy

I probably didn't graduate from elementary school...

You didn't graduate from elementary school

Because it's going to slide down, it's so slow that it's going to stop and slide something.

A:

Place the bevel. Divide into two equal portions and find the midpoint.

Let the trolley slide freely from the inclined plane, block the trolley with a metal plate in the first half, and measure the time t1 of the trolley in the first half.

Let the trolley slide freely from the inclined plane again, block the trolley with a metal plate at the end of the inclined plane, and measure the time t of the trolley in the whole process.

Calculate the time t2 for the second half.

The chain finch's speed is calculated as v1 and v2 in the first half and the second half.

To measure the average speed of the first and second half of the journey.

It is necessary to measure the length of the whole journey, the first half of the journey, the time of the first half of the journey, and the time of the whole journey; **As follows: measured content time (s) distance (m) average speed (m s) first half and second half of the whole journey.

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Answer: (1) Divide the inclined plane into two equal parts to find the midpoint; Zhao Xianpei let the car slide freely from the inclined plane, block the car with a metal plate at the first half, measure the time t 1 of the car in the first half of the car and let the car slide freely from the inclined plane again, block the car with a metal plate at the end of the inclined plane, measure the time t of the car in the whole process and calculate the time t of the second half of the journey; Calculate the velocity v 1 and v 2 of the first half and the second half; 2) From (1), in order to measure the average speed of the first half of the journey and the second half of the journey, the length of the whole journey, the first half of the journey, the time of the first half of the road transport cluster, and the time of the whole journey need to be measured; **As follows: Measured content Time (s) Distance only (m) Average speed (m s) First half Second half Full course.

Problem solving ideas: (1) whether the speed of the first half of the journey and the whole journey of the car changes when the car slides down the slope, it is necessary to measure the average speed of the ball through the first half of the distance and the average speed of the whole journey, and compare the speed to measure the speed, according to v=[s t], the distance and time should be measured, and a stopwatch and a scale should be used;

2) In the experiment, the time taken by the trolley to pass a certain distance should be measured, because the distance is shorter, it is easier to measure the time when the trolley speed is smaller, so the angle between the inclined plane and the desktop is not easy to be too large;

3) calculate the velocity in the second leg of the journey according to the positive loss of the panicle v=[s t];

4) Draw conclusions by comparing the changes in speed over the three legs

1) In the experiment, it is also necessary to measure the range of the trolley passing, so a scale is also used;

2) In the experiment, if the inclination angle of the inclined plane is too large, the trolley slides down very quickly, and it is difficult to measure the time, so the angle between the inclined plane and the desktop in the experiment should be small, so that it is used to measure the time;

3) the velocity of the second section v=[s t]=[1m;

4) According to the data in **, the speed of the car gradually increases in the process of sliding

So the answer is: (1) a scale; (2) small; （3）2；(4) In the process of sliding down, the speed of the car is getting bigger and bigger

2. In the experiment of "speed change of **trolley in the process of sliding along the inclined plane":

1) In addition to the inclined plane, the trolley, the metal plate and the stopwatch should also be required for the experiment

2) In the experiment, the angle between the inclined plane and the desktop should be empty-handed, and it should be filled in "large" or "small").

3) In the experiment, the students divided the 3m long inclined plane into three sections, and designed the following ** to record the experimental data, please supplement the following table according to the knowledge learned:

Distance (m) 1 1 1 Time (s) Speed (m s) 5 (4) The change in the speed of the test car is

<>It's not good to use junior high school, I use high school. If you are interested, you can turn to the compulsory one of high school physics.

This is not necessarily, maybe accelerating, maybe at a constant speed, or maybe decelerating.

Splits gravity in the direction of perpendicular and parallel inclined planes. The acceleration of the object is a=sin g- cos g

It is not necessarily, so there are three possible speed changes.

Well, because the object is subjected to a force parallel to the inclined plane downward (gravity is pulling it, it's time to go home for dinner), you can also think of the inclined plane as horizontal, then the object is subjected to a horizontal force, so the speed increases.

Gravitational acceleration.

And friction seems to be.

Gravitational potential energy is converted into kinetic energy.

The trolley is beveled by gravity on the inclined plane to face its support force and friction, and the downward slide is because the resultant force is downward along the inclined plane, so it should be the net force to be precise.

This is due to the fact that the car's own gravity breaks down a downward traction force in the horizontal direction of the ramp, so the car will slide down the ramp.

The component of gravity in the direction of the inclined plane is greater than the maximum static friction.

Gravity and the resultant force of support

When the trolley slides on an inclined surface, the longer the gravitational component acts, and the speed during the motion becomes faster and faster until a steady state is reached.

In addition, the larger the angle of the inclined surface, the greater the gravitational component of the trolley slide at this time, and the faster the speed. There is friction between the inclined surface and the trolley, which hinders the sliding speed of the trolley. If there is less friction in the mountain, it will be easier for the car to slide and accelerate.

Secondly, the greater the weight of the car, the greater the gravitational component of its descent process, and the faster the speed will be.

In general, in the sliding process of the inclined surface of the trolley, the velocity is the result of a combination of factors such as the gravitational component, the angle of the inclined surface, and the frictional force.

The more slippery it is, the faster it is.

1. The reason why the trolley is slipping is because the component of gravity along the inclined plane is greater than the friction force.

2. Speed = AT

a = gravitational component - friction force.

A certainly, so the increase between the barricades at any time, the greater the speed.

There is definitely a change in speed, and the role of the inclined plane is the gravitational pull and inertia of the earth.

1) according to the idea of the method of controlling variables; Let the trolley slide down from the same height position of the same inclined plane from a standstill, so that the trolley slides to the bottom end of the inclined surface with the same speed;

2) In the three experiments in the observation figure, the friction force of the trolley on the horizontal plane is different, which indicates that the friction of the trolley is related to the roughness of the contact surface;

3) Comparing the three figures, it is not difficult to see: the smoother the horizontal plane, the smaller the friction force on the trolley, the slower the speed decreases, and the farther the distance of the trolley;

4) On the basis of this experiment, reasonable reasoning can be obtained: when the moving object is not subject to external force, it always remains at rest in a state of equilibrium or a state of uniform linear motion, which is the famous Newton's first law;

So the answer is: (1) speed; (2) roughness; (3) small; Far; (4) Uniform linear motion; Newton was the first to congratulate the law of Victory

There are three cases.

1, uniform linear motion, when the trolley along the inclined plane of the component = the resistance of the trolley 2, uniform deceleration linear motion, when the trolley along the inclined plane of the component force "trolley resistance, and initial velocity" 03Uniform acceleration linear motion, when the trolley along the inclined plane of the component force 》The resistance experienced by the trolley.

If in the theoretical state (without considering air resistance, wheel friction, etc.), the trolley sliding off the inclined plane is in uniform acceleration motion, acceleration = gravitational acceleration g

It's not a uniform acceleration movement!

Rather, it accelerates in a straight line at a uniform pace.

This question was asked by the teacher, what kind of movement is the car that slides off the inclined plane?

The correct answer is: uniform acceleration in linear motion.

Because the flat throwing motion is also a uniform acceleration motion, but it is not a linear motion!

Compare the magnitude of the sliding force and the frictional force.

There are three scenarios:

1) When the sliding force is greater than the friction force, it is a uniform acceleration movement!

2) When the sliding force is less than the frictional force, it is a uniform deceleration motion.

3) When the sliding force is equal to the frictional force, it is moving at a uniform speed or at rest. (The object will remain in its original state of motion).

It depends on the situation! The trolley is subjected to gravity, support, and friction on an inclined plane! If the direction of the resultant force is parallel to the downward slope, it is a uniform acceleration motion, otherwise, it is a uniform deceleration, and the resultant force is 0 is a uniform motion!!

As long as the slope surface is uniform, the acceleration is a fixed value.