W4 - Force

Question 1

In projectile motion, what does a greater vertical velocity result in?

Answer 1

Greater height

Greater flight time

Greater range/distance achieved

Question 2

In projectile motion, what does a greater horizontal velocity result in?

Answer 2

Same height

Same total flight time

Greater range/distance

Question 3

What is the optimum release angle for a projectile?

Answer 3

45

Question 4

Whats the optimum release angle for shot put?

Answer 4

Less than 45

38-43 (Hay, 1993)

Question 5

How is total length jumped in long jump calculated?

Answer 5

L1 + L2 + L3

Hay & Miller, 1985

Question 6

Optimum angle of take-off for long lump

Why?

Answer 6

15-22 (Hay, 1993)

Centre of gravity height at take-off is HIGHER than at landing due to athletes body position when landing.

Question 7

Inertia

Answer 7

Resistance of a body to motion

Question 8

Mass

Answer 8

Amount of matter that makes up a body

Question 9

Greater mass = ?

Answer 9

Greater inertia

Question 10

Force

Scalar or vector?

Answer 10

Vector

Question 11

Internal + external are a type of force.

What are the others?

Answer 11

Contact

Non-contact (i.e weight due to gravity)

Question 12

Newtons law of gravitation

Answer 12

Any 2 particles of matter:

Attract to each other w/ a force DIRECTLY proportional to the product of their masses + INVERSELY proportional to the square of the distance between them.

Question 13

Newtons law of gravitation

Formula

Answer 13

F (directly proportional symbol) (m1 x m2) / d^2

F = Force on each particle 
M1 = Mass of 1st object 
M2 = Mass of 2nd object 
d = Distance

Question 14

Weight

Answer 14

Gravitational force exerted on the body by earth.

Question 15

What remains constant and what varies for a person on earth depending on their location?

Answer 15

Weight varies on location.

Mass remains constant.

Question 16

Newtons 1st law of motion

Answer 16

Object remains in the same state of motion unless a resultant/external force acts on in.

Question 17

What type of curve does a shot put follow during flight?

Answer 17

Parabolic

Question 18

What is true for all projectiles?

Answer 18

Force of gravity will continuously act on the mass of the object until it reaches the ground.

Question 19

Newtons 2nd law of motion

Answer 19

The acceleration of a body is proportional to the force causing it,
and the change takes place in the direction the force acts

Question 20

Newtons 3rd law of motion

Answer 20

For every force that is exerted by 1 body on another, there’s an equal + opposite force exerted by the 2nd body on the 1st.

Question 21

In how many dimensions can forces be measured using a force plate?

Answer 21

3

Question 22

What forces do you obtain by using a force plate?

Answer 22

Vertical force

Anterior-posterior forces

Medial-lateral forces

Question 23

What factors influence GRF?

Answer 23

Speed

Mass

Less directly influence, but can have an impact:

Surface
Footwear
Gait kinematics

Question 24

What would you expect to happen to the magnitude of peak vertical force and the duration of contact with the ground if the participant were to walk more quickly?

Answer 24

Peak vertical force ⬆️

Duration of contact w/ ground ⬇️