Impulse Flashcards
What is the formula for force?
F=MA
Force = mass x acceleration
How can you change your momentum to accelerate yourself?
Apply a force
Define impulse
The length of time a force is applied to an object
What is the formula for impulse?
Impulse = force x time
What is impulse equal to?
Impulse is equal to a change in momentum
What is it known as when an object is accelerated?
A positive impulse
What is it known as when an object is decelerated?
A negative impulse
When do positive and negative impulses occur in sport?
- More in contact with something to speed it up or slow it down
- When a force (impulse) is applied in sport over a period of time to help something speed up or slow down
Give an example of a positive impulse?
Discus spin or push pass in hockey
Give an example of a negative impulse?
Stopping a hockey ball or catching a ball in cricket
When is a positive impulse gained in a 100m race
Through the push phase of the stride (ground reaction force)
When is a negative impulse gained in a 100m race
Generated by ‘footfall’ where the foot lands to provide a braking action
Give the three points of the acceleration phase of a 100m sprint
- Net impulse is positive
- Acceleration
- Start of the race
Give the three points of the constant phase of a 100m sprint
- Net impulse is zero
- Constant
- Middle of the race
Give the three points of the deceleration phase of a 100m sprint
- Net impulse is negative
- Deceleration
- End of the race
