630878
Descrição
FlashCards por amyockenden, atualizado more than 1 year ago
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Criado por amyockenden
mais de 10 anos atrás
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| Questão | Responda |
| What is a force? (1) | Something which causes a change in motion (1_ |
| What 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) |
| What is the problem with speed? (1) | Only tells us how fast something is not how fast something is moving in a certain direction (1) |
| What is velocity and how is it calculated? (2) | Time taken to cover a linear distance known as displacement (1) Velocity = displacement/time (2) |
| What is acceleration and how is it calculated? (2) | The rate of change of velocity (1), average acceleration = final velocity - initial velocity/time |
| The number will be ... if the athlete is decelerating (1) | Negative (1) |
| What 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) |
| Explain 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) |
| What is friction? (1) | Attraction between two bodies (1), the parallel attraction of two surfaces sliding over one another (2) |
| What Is air resistance? (1) | The force generated between ourselves and air particles (1) |
| Explain 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) |
| Explain 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) |
| Explain 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) |
| What is ground reaction force? (1) | The force of pushing down and having the force equally and oppositely applied (1) |
| What 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) |
| What 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) |
| IMPULSE = MOMENTUM.. if momentum is also impulse, we can theorise that... (1) | Force x time = mass x velocity (1) |
| What 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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