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"The Existence of Force" PPT download
Part One: Observation:
1. When you squeeze the balloon with your fingers, what happens to the balloon?
2. When the spring is stretched and compressed by hand, what happens to the spring?
3. When you pull the rubber band with your hands, what happens to the rubber band?
in conclusion:
Force can change the shape of an object or force can deform an object
The Existence of Force PPT, Part 2: Step-by-Step Learning
1. Effect of force:
1. Force can change the shape of an object or force can deform an object.
2. Force can change the motion state of an object.
2. Generation of force:
Force is the action of an object on an object.
Can a force occur when objects are not in contact with each other? Please give an example.
Gravity (the attraction of the Earth to objects), the attraction of magnets to iron, etc.
1. Try to guess: Which of the following extrusion methods can produce this effect?
A. The left ball does not move and the right ball presses towards the left ball.
B. The right ball does not move and the left ball presses towards the right ball.
C. The two balls press toward the middle at the same time
2. The experimental results show that the method of action that can produce the graphic effect is ________.
3. Through the experiment, what new understanding did you gain about force?
3. The effects of forces are mutual
1. When force occurs, there are always objects exerting force and objects receiving force.
2. The object exerting force (receiving force) is also the object receiving force (exerting force) while exerting force (receiving force).
The Existence of Force PPT, Part 3: Classroom Exercises
1. Among the following phenomena, the motion state of the object does not change ( )
A Start the car so that it changes from stationary to moving
B The car suddenly brakes from moving to stationary
C The parachute falls in the air at a constant speed
D The stone falls faster and faster in the air
2. In the sport of springboard diving, when an athlete exerts force on the springboard, he is also subject to the force exerted on him by _______. However, the effects of the two forces are different. When the diver presses down on the springboard, the force of pressing the springboard changes the _______ of the springboard; when the springboard bounces up, the force of the springboard pushing the athlete changes the athlete's _______. ______________.
practise
1. Which of the following phenomena is an effect of force?
⑴The car starts at the station under the action of traction.
⑵ Pull the bow with your hand to bend it.
2. When playing football, the football will move forward because __________ has a strong effect on the football; at the same time, the foot feels pain because __________ also has a strong effect on the foot. This phenomenon illustrates _________.
3. A ripe apple falls from the tree to the ground due to the attraction of the earth. In the process, the apple ( )
A. It must attract the earth. B. It may not necessarily attract the earth.
C. It will definitely not attract the earth. D. Unsure.
4. Among the following phenomena, the object changes its state of motion due to the action of force ( )
A. Knead the dough vigorously to change its shape.
B. The basketball hit and bounced off the backboard
C. Hold the small balloon hard and the ball becomes deflated.
D. The balloon becomes larger after being inflated
Class exercises
1. Put a “√” in the brackets for the following statements that are correct.
⑴When pulling a cart, the horse only exerts force but not force, and the cart only exerts force but does not exert force.
⑵ Objects that are not in contact with each other will not have a strong effect
⑶Without objects, there would be no powerful effect
⑷ Force can deform an object and change its motion state.
2. A small boat that was originally parked on the water and remained stationary must rely on the oar to row forcefully toward ------- (forward, back) in order to get water to apply to the oar to _____ (forward, back) in order to move forward. The force behind) causes the boat to _____ (change, not change) its original stationary state and move forward.
3. Throw the ping pong ball hard against the wall, and the ball bounces back. This is because _____ has a ____ effect on _____, which means that the force between the objects is _________.
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"The Existence of Force" PPT courseware:
"The Existence of Force" PPT Courseware Part One: The Size of Force The unit of force in the International System of Units: Newton Abbreviation: Newton, unit symbol: N This name is named in memory of the great scientist Newton. Our country also uses Newton as the unit of force. You pick up...
"The Existence of Force" PPT:
"The Existence of Force" PPT Part One Content: 1. What is force? A large number of facts show that force is the action of an object on an object. There is no force when there is no object or only one object. Discussion 1. Can objects produce force without contact? 2. When objects come into contact...