Flashcards
Forces and newtons laws
Cards in this deck (18)
- 1What is a force? (1)Something which causes a change in motion (1_
- 2What is speed and how is it calculated? (2)Speed is the concept of how fast something is moving (1), average speed (m/s) = distance covered/time (2)
- 3What is the problem with speed? (1)Only tells us how fast something is not how fast something is moving in a certain direction (1)
- 4What is velocity and how is it calculated? (2)Time taken to cover a linear distance known as displacement (1) Velocity = displacement/time (2)
- 5What is acceleration and how is it calculated? (2)The rate of change of velocity (1), average acceleration = final velocity - initial velocity/time
- 6The number will be ... if the athlete is decelerating (1)Negative (1)
- 7What are scalors and vectors? (2)A scalar is a concept with one dimension like speed (1), a vector is a concept in two dimensions like velocity (2), vectors allow for physical application which is why we use them (3)
- 8Explain what is meant by gravity (2)The attraction between two bodies (1) a mutual relationship where its magnitude is dependent on the mass of the two bodies (2)
- 9What is friction? (1)Attraction between two bodies (1), the parallel attraction of two surfaces sliding over one another (2)
- 10What Is air resistance? (1)The force generated between ourselves and air particles (1)
- 11Explain newton first law of inertia (3)Objects prefer to stay in constant motion (1), a body will remain in a state of uniform motion in a straight line unless compelled to change its state of motion by a net external force acting upon it (2), mass is constant (3), net force = total of all the force acting on something (4), when net force is 0, the object will be still (5)
- 12Explain newtons second law of acceleration (3)Force = mass x acceleration (1), mass stays constant (2), momentum = mass x velocity (3), momentum is the amount of motion that a body possesses at a given velocity (4) the rate of change of momentum of an object is directly proportional to the force causing it to accelerate, a change in momentum takes place in the direction in which the force is applied (5)
- 13Explain newtons third law of reaction (1)When an object exerts a force on second object, there is a force equal in magnitude but opposite in direction (1)
- 14What is ground reaction force? (1)The force of pushing down and having the force equally and oppositely applied (1)
- 15What is impulse? (1)No matter how hard you apply force to an object the application is never instant (1), the force is applied over a period of time (2), this period of time multiplied by force is called impulse (3)
- 16What is FOOTFALL and what is it's purpose? (2)Each time a sprinter is in contact with the floor (1), allows sprinter to add momentum or maintain velocity during a sprint (2) impulse = force x time (3)
- 17IMPULSE = MOMENTUM.. if momentum is also impulse, we can theorise that... (1)Force x time = mass x velocity (1)
- 18What is the difference between a negative impulse and a positive impulse? (2)NEGATIVE - the force generated when absorbing the body and its motion (1) it occurs on landing and is a slowing force (2)
POSITIVE - this is the force generated to move the body forward (3), it occurs when the force is being applied to move you (4)
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- A Levels Physical Education A2 - BIOLOGY (Biomechanics ) Flashcards on Forces and newtons laws, created by amyockenden on 13/03/2014.
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