2. Measuring Forces Flashcards
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Measuring Forces
The following graph shows the reaction force recorded during a vertical jump
Force was measured over time (impulse)
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So…..what do scales really measure?
a) Mass
b) Weight
c) Force
d) All the above
What are Contact Forces?
The resistance that one surface or object encounters when moving over another
What is a Friction force?
- A force that is parallel to two surfaces in contact
- Opposes motion or prevents sliding
- A resistive force
- But…necessary for movement
What is refered to as Normal Contact Force (Reaction Force)?
Forces come in pairs - the normal force is the REACTION to the applied force
The reaction force is equal in magnitude but opposite in direction to the applied force
The reaction force is the external influence that is responsible for movemen
Why does friction occur?
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How do we calculate the force of friction?
Force of Friction (F) =
Coefficient of Friction (μ) x Normal Contact Force (R)
What is the Coefficient of Friction (μ)?
What is the Normal Contact Force (R)?
Coefficient of Friction (μ)
■ Reflects the interaction between two surfaces in contact
- 0 < μ < 1
Normal Contact Force (R)
■ Affected by the weight of the object
■ Not influenced by the surface area it covers
What are the 2 types of friction?
Static Friction and Dynamic Friction
What is Static Friction?
Two objects in contact but not in motion
What is Dynamic Friction?
Two objects moving over top of one another
Friction and Movement
Examples of utilizing wax to manipulate friction in sport:
