"How does an object move when a force is applied?" Motion and force PPT courseware

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"How does an object move when a force is applied?" Motion and force PPT courseware

teaching objectives

1. What are the conditions for knowing the balance of two forces?

2. Know the motion state of an object when two forces are balanced

3. Understand that the motion state of an object changes under the action of unbalanced forces

1. What is equilibrium state?

Uniform linear motion

still

2. Balance of two forces

When an object remains at rest or moving in a straight line at a uniform speed under the action of two forces, we say that the two forces balance each other or the two forces are balanced.

The force exerted on a balanced object is called equilibrium force.

3. Conditions for balance of two forces

Experimental conclusion: Conditions for the balance of two forces:

1. Equal in size

2. Opposite direction

3. Act on the same straight line

4. Act on the same object

think:

1. A book weighs 5N. I hold it stationary in the air with my hand. What is my pulling force F1 on the book?

2. I am pulling the book to make uniform linear motion in the air at a speed of 1m/s. What is the pulling force F2 I exert on the book?

3. I pulled the book in the air at a speed of 5m/s and made a uniform linear motion. I asked which pulling force F3 or F2 is greater?

4. Application of the conditions of balance of two forces

A. Determine the stress situation according to the motion status

1. The electric lamp suspended at rest is G=20N, and the tensile force of the wire is F=?

2. The tea cup is stationary on the table, m=0.25kg, the support force of the table is N=?(g=10N/kg)

3. For a trailer moving at a constant speed, F pull = 1.5×105N, f resistance =?

B. Judgment of motion status based on force conditions

1. A car is subjected to a pulling force of 50N and a resistance of 30N. How does the car move?

2. A book G=3N, the desktop’s support for it is N=3N, what is the state of the book?

Operation:

Classwork: Questions 2, 3, 4, 5, and 6 on page p59.

Tutorial (preview):

1. Review Chapter 7

2. What is pressure and its effects?

3. What is pressure?

4. How to increase or decrease pressure

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"How does an object move when a force is applied?" Motion and force PPT courseware 3:

"How does an object move when a force is applied?" Motion and Force PPT Courseware 3 Thinking: How many forces act on the chandelier? What is the state of motion of the chandelier? How many forces act on the goods being lifted at a constant speed? What is the state of motion of the goods? Uniform speed The fallen skydiver[athlete..

"How does an object move when a force is applied?" Motion and force PPT courseware 2:

"How does an object move when a force is applied?" Motion and force PPT courseware 2 1. What is the balance of two forces? When an object remains at rest or moves in a straight line at a uniform speed under the action of two forces, we say that the two forces balance each other or Two force balance. What other secondary forces in life...

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Update Time: 2024-11-20

This template belongs to Physics courseware Guangdong and Shanghai version of eighth grade physics volume 2 industry PPT template

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