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

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"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 the two forces are balanced.

What are other examples of balance between two forces in life?

2. Conditions for balance of two forces

(1) The masses of the weights in the two plates are equal

(2) The masses of the weights in the two plates are not equal

(3) The masses of the weights in the two plates are equal. Rotate the trolley at a small angle on the horizontal table and release.

There are many examples of objects that remain in motion under the action of a balancing force:

When a water droplet is about to fall to the ground, it falls at a constant speed. At this time, gravity and air resistance balance each other;

For a car traveling on a straight road to maintain a constant speed, the engine's traction and resistance must balance each other.

3. Unbalanced forces and changes in the motion state of objects

Activity 3: How does an object move when acted upon by an unbalanced force?

(1) Place the trolley on a smooth, horizontal table and place a weight in the plate. How will the motion state of the car change under the action of pulling force?

(2) As shown in the picture on the right, let a small ball roll from a certain height on the incline to a horizontal surface paved with cardboard. How does the ball's motion state change under the action of friction?

(3) Throw a small ball and observe its movement. Due to the effect of gravity, what is the path of the ball in the air? Has its state of motion changed?

Practice in class

The group discusses the following questions and expresses their opinions:

(1) A car traveling at a constant speed is still driving on a level road after turning off the engine. Some people say that the car is moving in the horizontal direction without force at this time. Is he right? Why?

(2) Why does a huge parachute need to be opened before the return capsule of the Shenzhou-9 spacecraft lands on the ground?

(1) His statement is wrong. The current car is affected by the friction of the ground. It continues to move forward due to inertia.

(2) The parachute can give the spacecraft an upward force, allowing the spacecraft to slow down its descent.

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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:

"How does an object move when a force is applied?" Motion and Force PPT Courseware Teaching Objectives 1. Know what are the conditions for the balance of two forces? 2. Know the state of motion of an object when two forces are balanced. 3. Understand that the state of motion of an object changes under the action of unbalanced forces... 1...

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Update Time: 2024-11-21

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

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