E2: Blackboard quiz questions

Question 1

Step length, stride length, and stride rate are temporal characteristics that are used to describe gait. What are the two phases that are used to describe walking and running gait?

Answer 1

stance and swing

Question 2

True or False: According to the law of conservation of linear momentum, when a baseball bat strikes a baseball, the total amount of momentum of the two objects does not change.

Answer 2

True

Question 3

Force multiplied by the time over which it acts is called ____________

Answer 3

impulse

Question 4

Two sprinters with different body masses exert the same muscle force off the block during the start of a 100 m sprint. Which sprinter accelerates off the blocks faster?

Answer 4

the lighter body mass

Question 5

A swimmer completes 10 laps in a 50m swimming pool, finishing where they started. What were the linear distance and displacements?

Answer 5

Distance = 500m; Displacement = 0m

Question 6

True or False: Acceleration is the rate of change in distance.

Answer 6

False

Question 7

Doing one lap around a standard track equals 400m. If a runner runs one lap in 79 seconds, what will there velocity be?

Answer 7

0 m/s

Question 8

A high jumper and long jumper both exert a great amount of force to maximize their takeoff velocity, but one jumps for height and the other for distance. What key variable differentiates the two?

Answer 8

trajectory