"Gravity" PPT courseware

Description

"Gravity" PPT courseware

Part 1: Why do objects fall?

Whereabouts will occur if the plane crashes

The diver will fall

Ripe fruits will fall

Water flows from high places to low places, etc.

The earth attracts everything around it downwards

Gravity PPT, Part 2: Learning Gravity

The force exerted on an object due to the attraction of the Earth

Unit of gravity: Newton (N)

Everything near the ground is affected by gravity

think

Which object exerts the gravity on an object?

(1) Direction of gravity

1. Hang the ball on the crossbar of the iron stand. When the ball is stationary, observe the direction of the thin line and draw the position of the thin line in Figure 3-48A of textbook P103.

2. Tilt the iron stand at an angle, observe the direction of the thin line, and draw the position of the thin line in Figure 3-48 B of textbook P103.

3. Confirm the direction of gravity based on experimental phenomena

Conclusion: The direction of gravity is always vertically downward (perpendicular to the horizontal plane).

The direction of gravity - always vertically downward

The pressure of the wood block on the incline

The weight of the block

(2) The point of action of gravity

The point where gravity acts on an object is called the center of gravity

The mass is evenly distributed. The center of gravity of a regular-shaped object is its geometric center.

(3) The size of gravity

The gravity exerted on an object is the weight of the object!

Factors related to gravity

As a force, the magnitude of gravity can be directly measured using a spring dynamometer, but what factors are related to the magnitude of gravity?

Combined with life experience: What assumptions would you make?

①The size of gravity may be related to the mass of the object. The greater the mass, the greater the gravity.

②The size of gravity may be related to the volume of the object. The larger the volume, the greater the gravity.

Gravity PPT, Part 3: Consolidation Practice

1. Which of the following objects experiences a gravity close to 10N ( )

A.A pencil B.A liter of water

C. A desk D. A TV

2. The ball accelerates down the slope. The correct diagram about the gravity on the ball is ( )

3. Regarding the meaning of g=9.8N/kg, which of the following statements is correct ( )

A.1kg is equal to 9.8N

B. The gravity on an object with a mass of 9.8kg is 1N

C. The gravity experienced by an object with a mass of 1kg is 9.8N.

D. An object with a mass of 9.8kg experiences a gravity of 9.8N.

4. A car sliding down from a bridge, the gravity it experiences during the sliding process ()

A. The size changes but the direction remains unchanged.

B. The size remains unchanged and the direction remains unchanged.

C. The size increases but the direction remains unchanged.

D. Size decreases and direction changes

Gravity PPT, Part 4: Summary:

Concept: The force exerted on an object due to the attraction of the earth

Direction: vertically downward

Size: G=mg g=9.8N/kg

Point of action: the center of the regular object

Keywords: Zhejiang Education Edition seventh grade science PPT courseware for the second volume free download, gravity PPT download, .PPT format;

For more information about the "Gravity" PPT courseware, please click the Gravity ppt tab.

"Gravity and Center of Gravity" Interaction PPT download:

"Gravity and Center of Gravity" Interaction PPT Download Part One: [Learning Achievements and Objectives] Physical Concepts: 1. Know that force is the interaction between objects. 2. Know the magnitude of gravity..

"Gravity and Center of Gravity" interaction PPT courseware:

"Gravity and Center of Gravity" Interaction PPT Courseware Part One Content: Course Standard Requirements 1. Know that force is the interaction between objects, and be able to describe force with force diagrams and schematic diagrams. 2. Know how powerful gravity is...

"Gravity and Center of Gravity" Interaction PPT:

"Gravity and Center of Gravity" Interaction PPT Part One Content: Learning Objectives 1. Know that force is the interaction between objects, and be able to describe force with force diagrams and schematic diagrams. 2. Know how powerful gravity is...

File Info

Update Time: 2024-11-22

This template belongs to science courseware Zhejiang Education Edition Seventh Grade Science Volume 2 industry PPT template

Preview