Question 1

Figure A4.5
 
-Considering the knee flexion (top) graph in Figure A4.5, the knee flexes three times

Accepted Answer

A) True 
 B)False  False

Question 2

If an athlete swam a 1500m race in 14 minutes and 31.02 seconds what would be their average speed in m/s?

Accepted Answer

1.72 m/s

Question 3

The centre of gravity is always located within the body and cannot be located outside of the body.

Accepted Answer

A) True 
 B)False  False

Question 4

Determine the average speed of an athlete who ran a 10,000 m race in 26 minutes and 17.53 seconds

Accepted Answer

The answer of Determine the average speed of an athlete...

Question 5

Static equilibrium is:

Accepted Answer

A)   When the sum of all external forces acting on an object or body is 1 (∑F = 1) .
B)   When an object or body is moving with a constant velocity (i.e. not accelerating) .
C)   When an object or body is at rest (i.e. not moving) .
D)   When the sum of all external forces acting on an object or body is 1 (∑F = -1) .
E)   When an object or body is accelerating at a constant rate.

Question 6

Immediately before the body comes to rest at the end of the countermovement of an standing vertical jump, which of the following statements is true?

Accepted Answer

A)   Velocity is negative and speed is decreasing.
B)   Velocity is zero.
C)   Velocity is positive and speed is increasing.
D)   Velocity is positive and speed is decreasing.
E)   Velocity is negative and speed is increasing.

Question 7

Determine the average speed of an athlete in metres per second (m/s) who ran a 100m race in 10.87 seconds

Accepted Answer

The answer of Determine the average speed of an athlete...

Question 8

During which of the following phases of a standing vertical jump is this statement true? 'The jumper's position is increasing, and both their velocity and acceleration are positive'.

Accepted Answer

A)   Between the jumper's first movement and when they reach their peak downwards velocity during the countermovement.
B)   Between when they reach their peak downwards velocity during the countermovement and when they reach the bottom of the countermovement.
C)   Between the bottom of the countermovement and when they reach their peak upwards velocity before the instant of take off.
D)   Between when they reach their peak upwards velocity and the instant of take off.

Question 9

A sprinter has a constant acceleration of 2 m/s2 during the first 5 s of a 100 m race. How far do they travel during this time?

Accepted Answer

A)   5 m
B)   75 m
C)   25 m
D)   10 m
E)   50 m

Question 10

State two ways the centre of gravity may influence the stability of an object

Accepted Answer

The answer of State two ways the centre of gravity...

Question 11

Draw a free body diagram (using the tip to tail method) to measure the resultant force for the following two forces:
A force of 25N in a North-Easterly direction
A force of 15N in a North-Westerly direction

Accepted Answer

The answer of Draw a free body diagram (using the...

Question 12

A person is standing upright with their arms by their sides. If they were to move their arms up over their head, their centre of gravity should:

Accepted Answer

A)   Move down towards the ground.
B)   Be located at their feet so they don't fall over.
C)   Move slightly upwards towards their head.
D)   Stay in the same position.
E)   Move laterally.

Question 13

In a regularly-shaped object of uniform density, the centre of gravity is found at the geometric centre of the object.

Accepted Answer

A) True 
 B)False

Question 14

A scalar quantity is:

Accepted Answer

A)   A quantity that is adjusted to scale
B)   A measurement such as velocity
C)   A quantity represented by magnitude and direction
D)   A quantity represented by magnitude only
E)   A quantity represented by direction only

Question 15

The centre of gravity in the human body may move depending on the posture and position of the limbs.

Accepted Answer

A) True 
 B)False

Question 16

How many yards are there in 1 mile

Accepted Answer

A)   2.14
B)   1.609
C)   1760
D)   1000
E)   1609

Question 17

Positive acceleration generally means 'speeding up' in in the context of human motion.

Accepted Answer

A) True 
 B)False

Question 18

The centre of gravity (COG) is defined as:

Accepted Answer

A)   The point that corresponds to the mean (average)  position for the concentration of the entire matter in the body.
B)   The point halfway along an object's vertical length.
C)   A value that is half of the total mass of an object.
D)   Non-existent.
E)   The point at which the entire weight of an object is assumed to be concentrated.

Question 19

An athlete is holding a 5kg dumbbell in their hand maintaining an elbow joint angle of approximately 100° of elbow flexion. Rearrange the equation "∑CWM + ∑ACWM = 0" to solve for the muscle force (F₁) needed to maintain static equilibrium, when: 
F₂ x d₂ = clockwise moment (negative) (∑CWM)
F₁ x d₁ = anti-clockwise moment (positive) (∑ACWM)
Weight force of arm, hand and dumbbell mass x acceleration due to gravity (F₂) = 9kg x 9.81m/s²
Perpendicular distance from joint axis to muscle force (d₁) = 0.04m
Perpendicular distance from joint axis to weight force (d₂) = 0.36m

Accepted Answer

The answer of An athlete is holding a 5kg dumbbell...

Question 20

Which of the following graphs most closely depicts the relationship between the take off velocity and the range (i.e. horizontal displacement) of a projectile?

Accepted Answer

A)   Image a
B)   Image b
C)   Image c
D)   Image d
E)   Image e

Exam 1: Kinematics of Linear Motion

Figure A4.5 -Considering the knee flexion (top) graph in Figure A4.5, the knee flexes three times

If an athlete swam a 1500m race in 14 minutes and 31.02 seconds what would be their average speed in m/s?

The centre of gravity is always located within the body and cannot be located outside of the body.

Determine the average speed of an athlete who ran a 10,000 m race in 26 minutes and 17.53 seconds

Static equilibrium is:

Immediately before the body comes to rest at the end of the countermovement of an standing vertical jump, which of the following statements is true?

Determine the average speed of an athlete in metres per second (m/s) who ran a 100m race in 10.87 seconds

During which of the following phases of a standing vertical jump is this statement true? 'The jumper's position is increasing, and both their velocity and acceleration are positive'.

A sprinter has a constant acceleration of 2 m/s² during the first 5 s of a 100 m race. How far do they travel during this time?

State two ways the centre of gravity may influence the stability of an object

Draw a free body diagram (using the tip to tail method) to measure the resultant force for the following two forces: A force of 25N in a North-Easterly direction A force of 15N in a North-Westerly direction

A person is standing upright with their arms by their sides. If they were to move their arms up over their head, their centre of gravity should:

In a regularly-shaped object of uniform density, the centre of gravity is found at the geometric centre of the object.

A scalar quantity is:

The centre of gravity in the human body may move depending on the posture and position of the limbs.

How many yards are there in 1 mile

Positive acceleration generally means 'speeding up' in in the context of human motion.

The centre of gravity (COG) is defined as:

Which of the following graphs most closely depicts the relationship between the take off velocity and the range (i.e. horizontal displacement) of a projectile?