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

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

think:

How many forces act on the chandelier?

What is the movement status of the chandelier?

How many forces act on the cargo being lifted at a constant speed?

What is the movement status of the cargo?

Skydiver falling at a constant speed

How many forces act on the [athlete and parachute]?

What's their status?

Uniform linear motion

Balance: An object remains at rest or moves in a straight line at a uniform speed.

Equilibrium force: the force exerted on a balanced object

Two-force equilibrium: If an object is in equilibrium due to only two forces.

Experimental conclusion: Conditions for the balance of two forces:

1. The two forces are equal in magnitude.

2. Opposite direction

3. Act on the same straight line

4. Act on the same object

5. Consolidate practice

1. Among the forces exerted on a book placed on a horizontal table, which one is a balancing force?

A． The pressure of the book on the tabletop and the gravity of the book;

B． The pressure of the book on the tabletop and the support of the tabletop on the book;

C. The gravity of the book and the support of the book on the tabletop;

D． The pressure of the book on the desktop plus the gravity of the book and the support of the book on the desktop.

2. When the crane's wire rope lifts a heavy object, please compare: when the weight is stationary, when the weight rises at a constant speed, and when the weight drops at a constant speed, the pulling force of the wire rope on the weight is:

A． When the weight rises at a constant speed, the pulling force is maximum

B． When the weight is stationary, the pulling force is greatest

C. When a heavy object falls at a constant speed, the pulling force is maximum

D． In the above three cases, the pulling force is the same

Exercise 2

1. An object placed on the horizontal ground is pulled with a force of 1N in the horizontal direction, but it does not pull. If the object is still not pulled when the pulling force is increased to 10N, then the magnitude of the friction force experienced by the object twice is ( )

A. Both are 1N B. The first time is 1N, the second time is 10N

C. Both are 10N D. Unable to judge

2. Which of the following statements is correct ( )

A. When a force acts on an object, the object’s motion state must change.

B. To change the motion state of an object, force must be exerted on the object

C. When an object is acted upon by a balancing force, it must remain at rest or move in a straight line at a uniform speed.

D. When an object remains stationary or moving in a straight line at a uniform speed, it must be affected by a balancing force.

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"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...

"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

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