"Synthesis of Two Forces on the Same Straight Line" Motion and Force PPT Courseware 2

Description

"Synthesis of Two Forces on the Same Straight Line" Motion and Force PPT Courseware 2

1. Combined force

When several forces act together on an object, their effect can be replaced by one force, which is called the resultant force of those forces.

If the magnitude and direction of several forces are known, finding the magnitude and direction of the resultant force is called the synthesis of forces.

Similarity:

Only two forces are exerted on the same straight line

Question: How to find the resultant of two forces?

2. The synthesis of two forces on the same straight line

1. Synthesis of forces: Find the resultant of several forces

2. The synthesis of two forces: find the resultant of two forces

experiment

The resultant force of two forces with the same direction on the same straight line is equal to the sum of the magnitudes of the two forces, and the direction is the same as the direction of the two forces.

Size:F=F1+F2

Direction: Same as the direction of both forces

The resultant force of two forces with opposite directions on the same straight line is equal to the difference in magnitude of the two forces, and the direction is the same as the larger force.

Size: F= F1- F2

Direction: Same as the direction of greater force

Example 1: A person lifts an object weighing 250N vertically upward with a force of 300N. What is the resultant force on the object? What's the direction?

Analysis: The resultant force of two forces is required to be performed in the following order.

① Determine whether these two forces act on the same object.

② Determine whether the directions of the two forces are the same or opposite.

③ Calculate the magnitude and direction of the resultant force according to the synthesis method of the same direction or the opposite direction.

Solution: It can be seen from the question that the pulling force F is in the opposite direction to the object's gravity G;

The resultant force F=F- G =300 N—250 N=50 N;

Resultant force direction: vertically upward.

feedback reinforcement

1. If a force produces the same effect as two forces, the force is called the _____ of those two forces.

2. A spring balance is used to pull an object upward. The indication of the spring balance is 10 N, and the gravity of the object is 8 N. The resultant force on the object is _____N, and the direction is _____.

3． An object weighing 10 N is placed on a horizontal table, and a 100 g weight is placed on the object. At this time, the pressure on the table is _____N.

Improvement question: After the skydiver opens the parachute, he experiences air resistance of 400N. The total mass of the parachutist and the parachute is 50kg. Draw a schematic diagram of the force on the parachutist and calculate the magnitude and direction of the resultant force on the parachutist? (g is taken as 10N/kg)

Solution: It can be seen from the meaning of the question: f=400N G=mg=50kg*10N/kg=500N Gravity and resistance are two forces on the same straight line and in opposite directions.

The resultant force F=G-f=500N-400N=100N

Direction of resultant force: vertically downward

3. Summary of knowledge

1. Combined force:

2. Synthesis of force:

3. The synthesis of two forces on the same straight line

(1) Same direction: F=F1+F2

(2) Reverse: F= F1- F2

Keywords: teaching courseware on the synthesis of two forces on the same straight line, teaching courseware on motion and force, download the Physics PPT courseware for the second volume of the eighth grade edition of Beijing Normal University, download the physics slide courseware for the eighth grade, download the PPT courseware on the synthesis of two forces on the same straight line , motion and force PPT courseware download, .PPT format;

For more information about the PPT courseware "Synthesis of Two Forces on the Same Straight Line of Motion and Force", please click the Synthesis of Two Forces on the Same Straight Line of Motion and Force ppt tag.

"Synthesis of Two Forces on the Same Line" Motion and Force PPT Courseware 4:

"Synthesis of Two Forces on the Same Line" Motion and Force PPT Courseware 4 The effects of forces are the same! An elephant can drag an object that can be dragged by many people. Resultant force If a force produces the same effect as two forces acting together, the force is...

"Synthesis of Two Forces on the Same Line" Motion and Force PPT Courseware 3:

"Synthesis of Two Forces on the Same Line" Motion and Force PPT Courseware 3 Learning Objectives 1. Understand the concept of combined force. 2. Understand the synthesis of two forces on the same straight line; be able to flexibly use it to analyze and solve simple problems. 1. Net force and combination of forces Several forces act together on a...

"Synthesis of Two Forces on the Same Straight Line" Motion and Force PPT Courseware:

"Synthesis of Two Forces on the Same Straight Line" Motion and Force PPT Courseware Preview Tips 1. If the effect produced by a force is the same as the effect produced by the combined action of two forces, this force is called the _________ of those two forces. 2. The sum of two forces with the same direction on the same straight line...

File Info

Update Time: 2024-10-22

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume 2 industry PPT template

Preview