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Forces & Motion Notes
Lesson 2: The Force of Gravity
Lesson 3: The Force of A Rubber Band (Elastic Force)
Lesson 4: The Force of Friction
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Lesson 2: The Force of Gravity
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Matter-
anything that has mass & takes up space
Mass-
the amount of matter in an object
Weight-
the measure of the force of gravity
acting on an object
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GravityGravity is a force that pulls objects toward each
other
The force of gravity acts between all objects on earth and in the universe
Earth’s gravity pulls everything towards its center
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Forces are measured in Newtons
• The weight of an apple is about 1 Newton.
• The weight of a bag of sugar is 10 Newtons.
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Lesson 3:The Force of A Rubber Band
(Elastic Force)
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8
Stetching
Pull
Pull harder
hold
hold
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9
Stop pulling and ---
• Elastic materials spring back into shape.
• Plastic materials stay stretched.
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Elastic Forces
• A type of matter is considered to be elastic if returns to its original shape after being squeezed or stretched.
• Examples of Elastic Matter:• • •
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Types of Elastic ForcesThere are two types of elastic forces: tension and compression
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Tension Compression
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Placing a stent in an artery
1. The squeezed stent is placed at the blockage.2. A balloon opens the stent.3. The stent keeps the artery open so the blood can flow.
Step 1
Step 2
Step 3
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Forces can do amazing things!Science saves lives
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Lesson 4:The Force of Friction
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Friction• Friction is a force that two surfaces exert on each other when
they rub against each other.
• Friction is a force that acts in the opposite direction to the motion of an object.
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Types of Friction
Sliding Friction 2 solid surfaces slide over each other
Rolling Friction An object rolls across a surface
Fluid Friction Solid object moves through a fluid
Static Friction Acts on objects that are not moving
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Drag= another word for air friction
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THE ENDTHE END