Linear motion: Levers: impulse

Question 1

What is linear motion?

Answer 1

Motion in a straight line where all body parts are moving at the same speed.

Question 2

What is mass?

Answer 2

how heavy something is

Question 3

how do we measure mass?

Answer 3

kg

Question 4

what is weight?

Answer 4

gravitational force exerted on an object

Question 5

how do we measure weight?

Answer 5

N (newtons)

Question 6

How do we calculate weight?

Answer 6

weight = mass x effect felt by gravity (9.8)

Question 7

What is inertia?

Answer 7

The reluctance of a body to move.

Question 8

how do different masses effect inertia?

Answer 8

bigger mass = bigger inertia

smaller mass = smaller inertia

Question 9

What is distance?

Answer 9

the path a body takes as it moves from the starting point to finishing point.

Question 10

What is displacement?

Answer 10

The shortest route in a straight line between the start point and an end point

Question 11

what is speed?

Answer 11

how fast a body’s movement is with no reference to direction

Question 12

how do we calculate speed?

Answer 12

speed = distance / time

Question 13

what is velocity?

Answer 13

the rate of change of displacement

Question 14

how do we calculate velocity?

Answer 14

velocity = displacement / time

Question 15

What is acceleration?

Answer 15

rate of change of velocity

Question 16

how do we calculate acceleration?

Answer 16

acceleration = change in velocity / time

Question 17

How do we calculate momentum?

Answer 17

momentum = mass x velocity

Question 18

how do we measure momentum?

Answer 18

kgm/s

Question 19

How do we measure change in velocity?

Answer 19

final velocity - initial velocity / time

Question 20

what should a net impulse graph look like at the start of a race/take off?

Answer 20

Large positive impulse

Question 21

what should a net impulse graph look like during the middle of a race?

Answer 21

• equal sized positive and negative impulses

- shows constant velocity

Question 22

what should a net impulse graph look like at the end of a race?

Answer 22

large negative impulse

Question 23

what does a first class lever look like?

Answer 23

effort———-fulcrum———-resistance

Question 24

benefits/disadvantages of first class lever

Answer 24

• large range of motion
• resistance can move quickly
• cannot apply much force to move an object

Question 25

What does a second class lever look like?

Answer 25

fulcrum———-resistance———-effort

Question 26

what are the benefits/disadvantages of second class levers?

Answer 26

• can generate much larger forces
• has to lift whole body weight
• slow
• limited range of motion

Question 27

what does a third class lever look like

Answer 27

fulcrum———-effort———-resistance

Question 28

advantages/disadvantages of third class lever

Answer 28

• large range of motion
• resistance is able to be moved quickly
• cannot apply much force to move the object

Question 29

what is a mechanical advantage?

Answer 29

• when the effort arm is longer than the resistance arm

- allows for a larger load to be moved over a small distance with less effort

Question 30

what is a mechanical disadvantage?

Answer 30

• when the resistance arm is longer than the effort arm.

- means that cannot move as heavy a load but can do it faster.

Question 31

example of a first class lever

Answer 31

extension of the elbow (triceps)

Question 32

example of a second class lever

Answer 32

plantarflexion in the ankle

Question 33

example of a third class lever

Answer 33

• hip flexion
• elbow extension (bicep)
• knee flexion

Question 34

what is impulse?

Answer 34

The measure of force applied to something over a period of time.

Question 35

How do we measure impulse?

Answer 35

Ns (Newton seconds)