"Kinetic Energy and Potential Energy" Work and Mechanical Energy PPT Courseware 4

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"Kinetic Energy and Potential Energy" Work and Mechanical Energy PPT Courseware 4

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In the following situations, what work does a person do on an object ( )

A. Weightlifter holds the barbell motionless while being photographed by reporters

B． A person carrying a heavy object moves forward at a constant speed along a level road

C. A person pushes a cart with force and the cart moves on the horizontal ground in the direction of the force.

D． The child tried hard to move the stone but failed to move it

1. Ability

1. Objects can do work on the outside, and each object has energy, referred to as energy. Unit: joule (J)

2. The more work an object can do, the more energy it has.

What do moving bullets, running water, and a moving hammer have in common?

What factors are related to the magnitude of kinetic energy?

design experiment

1. Make a guess:

The amount of kinetic energy may be related to factors such as the ______ of the object.

2. Design experimental plan

hint

(1) Consider the “control variable method”

(2) How to compare the magnitude of kinetic energy?

Want to discuss:

The picture shows a scene of a highway. Please explain it in physics terms:

(1) Why should the driving speed of motor vehicles be limited?

Answer: (1) The greater the speed of an object, the greater its kinetic energy, making it difficult to brake and easily causing traffic accidents.

(2) Why do different models of vehicles have different speed limits on the same road?

Answer: The greater the mass, the greater the kinetic energy, so the speed limit of buses is lower than that of cars.

think

1. Did the heavy hammer do any work on the pile?

2. The lifted heavy hammer has the ability to do work on the pile, so the lifted heavy hammer should have ____;

3. So what is the function of the lifted weight?

2. Gravitational potential energy

1. The energy an object possesses due to being lifted high is called gravitational potential energy.

All objects that are lifted have gravitational potential energy.

2. What factors are related to the magnitude of gravitational potential energy?

1. Make conjectures:

The gravitational potential energy of an object may be related to ______ and ______. possible……

2. Design experiments:

"Control Variable"

A: Lift the weights of different masses to the same height and then let them fall freely, and observe the extent of the wooden pile sinking each time.

B: Lift the same weight to different heights and then let it fall freely, hit the wooden pile, and observe the degree of subsidence of the wooden pile each time.

Try to practice

1. A car and a truck move in a straight line at a constant speed on a straight road, then it can be determined that ( )

A. The kinetic energy of a car must be greater than that of a truck;

B. The kinetic energy of trucks must be greater than that of cars;

C. The kinetic energy of the car must be equal to that of the truck;

D. The kinetic energy of a car may be greater than that of a truck.

2. There is a line in Tang poetry: "The Yellow River is far up among the white clouds, and the endless Yangtze River is rolling in." This moving line vividly and vividly reflects that this great river contains a large amount of ______ energy and ______ energy.

3． A magpie with a larger mass and a swallow with a smaller mass fly in the air. If their kinetic energy is equal, then _____ flies faster.

4. There are lines in Tang poetry such as "The Yellow River is far up among the white clouds" and "The endless Yangtze River is rolling in". These moving lines vividly and vividly reflect that these two rivers contain a lot of __________.

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Update Time: 2024-08-10

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 2 industry PPT template

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