2. Measuring Forces

Question 1

Answer 1

check notes

Question 2

Measuring Forces
The following graph shows the reaction force recorded during a vertical jump
Force was measured over time (impulse)

Answer 2

check notes

Question 3

So…..what do scales really measure?
a) Mass
b) Weight
c) Force
d) All the above

Question 4

What are Contact Forces?

Answer 4

The resistance that one surface or object encounters when moving over another

Question 5

What is a Friction force?

Answer 5

• A force that is parallel to two surfaces in contact
• Opposes motion or prevents sliding
• A resistive force
• But…necessary for movement

Question 6

What is refered to as Normal Contact Force (Reaction Force)?

Answer 6

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

Question 7

Why does friction occur?

Answer 7

check notes

Question 8

How do we calculate the force of friction?

Answer 8

Force of Friction (F) =
Coefficient of Friction (μ) x Normal Contact Force (R)

Question 9

What is the Coefficient of Friction (μ)?

What is the Normal Contact Force (R)?

Answer 9

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

Question 10

What are the 2 types of friction?

Answer 10

Static Friction and Dynamic Friction

Question 11

What is Static Friction?

Answer 11

Two objects in contact but not in motion

Question 12

What is Dynamic Friction?

Answer 12

Two objects moving over top of one another

Question 13

Friction and Movement

Answer 13

Question 14

Examples of utilizing wax to manipulate friction in sport:

Answer 14