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"Gravity" Motion and Force PPT Courseware 3
1. What is gravity?
All objects will fall to the ground when they lose support. This is because the Earth has a gravitational pull on objects around it, pulling them toward the ground.
The force exerted by objects near the ground due to the attraction of the earth is called gravity.
For simplicity of description, we often refer to the gravity exerted by an object as simply the weight of the object.
Represented by the capital letter "G".
think
Force is the effect of an object on an object. The object exerting force and the object receiving force exist at the same time. So what are the objects exerting force and objects receiving force due to gravity?
2. Explore what factors are related to the size of gravity
1. Conjecture:
What is the relationship between weight and quality?
Explore the relationship between the gravity on an object and its mass.
Experimental exploration
Use a spring dynamometer to measure the gravity on the hook code with masses of 50g, 100g, 150g, 200g... and record it in the table below (page 21 of the textbook).
Pay attention to observe:
When a hook code with a mass of 50g is suspended from the lower end of the spring scale, the position of the spring scale's pointer is located.
When the mass is 0.05kg:
Gravity is about 0.5N.
When two hooks with a mass of 50g are suspended from the lower end of the spring scale, the position of the pointer of the spring scale.
When the mass is 0.1 kg:
Gravity is about 1N.
When three hooks with a mass of 50g are suspended from the lower end of the spring scale, the position of the pointer of the spring scale.
When the mass is 0.15 kg:
Gravity is about 1.5N.
Experimental conclusion: The gravity exerted by an object is directly proportional to the mass of the object.
G/m=9.8N/kg expressed by g=9.8N/kg
G—Gravity—Newton (N)
m—mass—kilogram (kg)
G=m g, g=9.8N/kg. It means that the gravity experienced by an object with a mass of 1kg is 9.8N. For the convenience of calculation, g=10N/kg can be taken as a rough calculation.
3. Direction of gravity
Use a thread to hang the object. When the object is stationary, the direction of the thread is consistent with the direction of gravity. This direction is called the vertical direction.
The direction of gravity is vertically downward.
Determine the direction of gravity
The direction of gravity on an object is always vertically downward.
Usually we call the line that is consistent with the direction of gravity called the perpendicular line.
4. Center of Gravity - The point where gravity acts on an object is called the center of gravity
The center of gravity of an object with uniform texture and regular shape is at its geometric center.
The center of gravity of a record with uniform quality and regular shape is at the center of its circle.
Class summary
1. Gravity: the force exerted on an object due to the attraction of the earth, symbol G
2. The magnitude of gravity: The gravity experienced by an object is proportional to the mass of the object
G=m g G—Gravity—Newton (N)
m—mass—kilogram (kg)
3. Direction of gravity: vertically downward
4. The point of action of gravity: center of gravity
try
1. The force exerted on objects near the ground due to the attraction of the earth is called ______, and its direction is always _______. Taking advantage of this property, construction workers often use heavy hammer wires to check whether walls are _____, and they can also use heavy hammer wires to check whether tabletops or windowsills are ______.
2. The moon's attraction to objects is only one-sixth that of the earth. If a metal block weighing 98N is moved to the moon, its mass will be ___kg and its gravity will be _____N.
Testing and evaluation
1. Which of the following statements about gravity is correct ( )
A. The direction of gravity is vertically downward
B. Only objects in contact with the ground are affected by gravity
C. The direction of gravity is vertically downward
D. The apple fell because the apple was overripe.
2. The secret of the toy "tumbler" standing up automatically after being knocked down is ( )
A. Gravity is too small and can be ignored
B. The center of gravity is low and not easy to tip over.
C. The direction of gravity is always vertical downwards
D. There is an automatic lifting device inside
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