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The effect of a force on an object depends on how long it acts, as well as how great the force is. For example, in a tennis swing, a very large force acting for a short time had a great effect on the momentum of the tennis ball. A small force could cause the same change in momentum, but it would have to act for a much longer time. For example ...
IMPULSE: CHANGE IN MOMENTUM. Change in momentum equals the average net external force multiplied by the time this force acts. Δ→p = →F netΔt Δ p → = F → net Δ t. The quantity →F netΔt F → net Δ t is given the name impulse. There are many ways in which an understanding of impulse can save lives, or at least limbs.
Jun 16, 2022 · Nerve impulse. Definition. noun. (1) The movement of action potential along a nerve fiber in response to a stimulus (such as touch, pain, heat or cold). (2) The relaying of a coded signal that travels along a nerve cell membrane to an effector, such as muscle, gland or another nerve cell. Supplement.
- Resting Potential
- Chemical Synapses
- Neurotransmitters and Receptors
- Attributions
- References
When a neuron is not actively transmitting a nerve impulse, it is in a resting state, ready to transmit a nerve impulse. During the resting state, the sodium-potassium pump maintains a difference in charge across the cell membrane of the neuron. The sodium-potassium pump is a mechanism of active transport that moves sodium ions (Na+) out of cells a...
At a chemical synapse, both the presynaptic and postsynaptic areas of the cells are full of molecular machinery that is involved in the transmission of nerve impulses. As shown in Figure 8.4.3, the presynaptic area contains many tiny spherical vessels called synaptic vesicles that are packed with chemicals called neurotransmitters. When an action p...
There are more than a hundred known neurotransmitters, and more than one type of neurotransmitter may be released at a given synapse by a presynaptic cell. For example, it is common for a faster-acting neurotransmitter to be released, along with a slower-acting neurotransmitter. Many neurotransmitters also have multiple types of receptorsto which t...
Figure 8.4.1 Lightening/ Purple Lightning, Dee Why by Jeremy Bishop on Unsplash is used under the Unsplash License(https://unsplash.com/license). Figure 8.4.2 Action Potential by CNX OpenStax, Biology on Wikimedia Commons is used under a CC BY 4.0(https://creativecommons.org/licenses/by/4.0/deed.en) license. Figure 8.4.3 Chemical_synapse_schema_cro...
Amoeba Sisters. (2020, January 29). Sodium potassium pump. YouTube. https://www.youtube.com/watch?v=7NY6XdPBhxo&feature=youtu.be CNX OpenStax. (2016, May 27) Figure 4 The action potential is conducted down the axon as the axon membrane depolarizes, then repolarizes [digital image]. In Open Stax, Biology(Section 35.2). OpenStax CNX. https://cnx.org/...
- Christine Miller
- 2020
Nov 21, 2023 · Biology ; Chemistry ; Earth Science ; ... 0:01 Definition of Impulse; 1:39 Examples of ... Because impulse is a measure of how much the momentum changes as a result of force acting on it for a ...
Dec 17, 2019 · Impulse is the change in momentum vector. Therefore the x− x − component of impulse is equal to - 2mμ 2 m μ and the y− y − component of impulse is equal to zero. Now consider the change in momentum of the second ball. pxi = m/mucos30o; pyi = −mμ30o (7.13.5) (7.13.5) p x i = m / m u c o s 30 o; p y i = − m μ 30 o.
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May 17, 2021 · F = ma. solve this for a and get. a = F/m. Stick this into the velocity equation and get. v – v 0 = (F/m)t. Multiply both sides by m. mv – mv 0 = Ft. The left side of the equation deals with momentum (often denoted by a lower-case p) and the right side is impulse (often denoted by an upper-case letter J).
