linear motion (principles 4 & 5)

Question 1

define momentum

Answer 1

the quantity of motion contained with an object or body; equal to the product of the object’s mass and its velocity

Question 2

define velocity

Answer 2

the rate and direction of motion of an object or body, calculated at the change in displacement (or position) of the object over time

Question 3

define impulse

Answer 3

the application of a force over a period of time; impulse equals force multiplied by time

Question 4

what is principle 4?

Answer 4

momentum = mass x velocity
the greater the applied impulse, the greater the increase in velocity

Question 5

what is an example of principle 4?

Answer 5

the fosbury flop - as high jumpers near the bar, they arch their neck and back and push against the ground to create a powerful impulse force
an equal and opposite ground reaction force is generated, which propels the high jumper into the air

Question 6

what is principle 5?

Answer 6

movement usually occurs in the direction opposite that of the applied force

Question 7

what is an example of principle 5?

Answer 7

when completing a length of a pool, freestyle swimmers turn and push against the wall of the pool with their legs
the swimmers’ bodies are propelled forward in the direction opposite that of the applied force