"Two Force Balance" Motion and Force PPT Courseware 6

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"Two Force Balance" Motion and Force PPT Courseware 6

1. Balance state, balance of two forces

1. Equilibrium state: The motion state of the above objects has not changed. These objects are all at rest or in a state of uniform linear motion.

2. Balance force: several forces that keep an object in a state of equilibrium

3. Two-force balance: When an object is acted upon by two forces, it is in a state of equilibrium.

Conditions for balance of two forces

Experiments show that the conditions for the balance of two forces are:

Two forces acting on the same object must have magnitude __________, direction __________, and act on __________.

3. Application in life after learning the balance of two forces

1. Determine the motion state of the object based on the force on the object

Which object in the picture below can remain at rest? Why?

2. For a suspended electric lamp, if the gravity of the electric lamp is known to be 10 N, then the pulling force exerted by the wire on the electric lamp is _______N and the direction is _________.

A skydiver and his parachute fall in a straight line at a constant speed in the air. If the total weight of the skydiver and the parachute is 1500 Newtons, can you tell the pulling force on them?

4. A cargo weighing 2000 N is suspended from the wire rope of the crane. What is the tension of the wire rope under the following circumstances? (1) When the cargo is stationary; (2) The cargo rises at a constant speed of 1 meter/second; (3) The cargo falls at a constant speed of 1.5 meters/second.

5. A car weighing 1000N moves in a straight line at a constant speed along the horizontal ground under a traction force of 200N. The friction force on the car is ( )

A. 1000N B. 200N

C. 800N D. 1200N

6. The mass of a helicopter is 2t. The rotor must provide _______ lift upward to make it hover in the air. The direction of the lift is ____.

If an airplane rises in a straight line at a constant speed of 1m/s, the lift it requires is _______. If an airplane rises in a straight line at a constant speed of 1.5 m/s, the lift it requires is _______.

1. A desk lamp placed stationary on a horizontal table, the balancing force it receives is ( )

A. The gravity of the desk lamp and the support of the desk lamp to the desk lamp

B． The pressure of the desk lamp on the desktop and the support of the desk lamp on the desk

C. The pressure of the desk lamp on the table and the gravity on the table

D． The gravity of the desk lamp and the pressure of the desk lamp on the desktop

2. An object is acted upon by two forces. The three elements of these two forces are exactly the same. These two forces

A. It must be a balancing force

B. Definitely not a balancing force

C. It must be gravity and support

D. It must be tension and friction

3. Among the statements about the balance of two forces, which one is correct ( )

A. An object is acted upon by two forces. If it is in a state of uniform linear motion, the two forces must be balanced forces.

B. An object moving in a straight line at a uniform speed must only be acted upon by a pair of balancing forces.

C. As long as two forces are equal in magnitude, opposite in direction, and act in a straight line, the two forces must be balanced forces.

D. The above situations are all possible

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For more information about the PPT courseware "Motion and Forces and Balance of Two Forces", please click on the "Movement and Forces ppt Two Forces Balance ppt" tab.

"Conditions for Balance of Two Forces" PPT courseware:

"Conditions for Balance of Two Forces" PPT courseware Part 1: Observation How many forces act on the chandelier? How is your exercise status? The chandelier is acted upon by two forces. The chandelier is stationary. How many forces are exerted on the cargo? How is your exercise status? The cargo is subject to two forces...

"Conditions for Balance of Two Forces" PPT:

"Conditions for Balance of Two Forces" PPT Part One Content: Scenario Exploration We know that force is the cause of changing the motion state of an object. All objects around us are subject to forces without exception, but why do many objects still maintain their motion state unchanged?

"Two Force Balance" Force and Motion PPT Courseware 2:

"Two Force Balance" Force and Motion PPT Courseware 2 Observation: When a car is at rest, is it affected by external forces? Observation: The plane can maintain uniform linear motion in the air. Does it receive any force? 1. Equilibrium state: An object is acted upon by two (or more) forces..

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Update Time: 2024-11-23

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

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