Linear Motion

Question 1

Definition of linear motion

Answer 1

Movement of a body in a straight or curved line where all parts move the same distance, in the same direction over the same time

Question 2

Definition of direct force

Answer 2

Force applied through the centre of mass resulting in linear motion

Question 3

Definition of centre of mass

Answer 3

The point at which a body is balanced in all directions. The point from which weight appears to act

Question 4

What does linear motion result from?

Answer 4

Results from a direct force being applied to a body, where the force is applied directing to the centre of a body’s mass

Question 5

What are examples of linear motion in sport?

Answer 5

Water skier, bobsleigh, skeleton, luge

Question 6

What is the definition of distance?

Answer 6

The total length covered from start to finish positions

Question 7

What are the units for distance?

Answer 7

meters (m)

Question 8

What is the definition of displacement?

Answer 8

The shortest straight line route from start to finish positions

Question 9

What are the units of displacement?

Answer 9

meters (m)

Question 10

What is the definition of speed?

Answer 10

The rate of change in distance

Question 11

What are the units for speed?

Answer 11

m/s

Question 12

What is the calculation for speed?

Answer 12

Speed = distance / time

Question 13

Definition of velocity

Answer 13

The rate of change in displacement

Question 14

What are the units for measuring velocity?

Answer 14

m/s

Question 15

What is the equation to calculate velocity?

Answer 15

Velocity = displacement / time

Question 16

Definition of acceleration

Answer 16

The rate of change in velocity

Question 17

What are the units for acceleration?

Answer 17

m/s/s

Question 18

What is the equation for calculating acceleration?

Answer 18

Acceleration = (final velocity - initial velocity) / time

Question 19

Definition of deceleration

Answer 19

The rate of change in velocity (decrease or negative)

Question 20

What are the units of deceleration?

Answer 20

m/s/s

Question 21

What is the equation to calculate deceleration?

Answer 21

Deceleration = (final velocity - initial velocity) / time

Question 22

What is the equation to calculate distance?

Answer 22

Distance = speed x time

Question 23

How can we calculate acceleration using F=MA?

Answer 23

Acceleration = force / mass

Question 24

What are the three different graphs of linear motion?

Answer 24

distance/time
speed/time
velocity/time

Question 25

What axis is time on for linear motion graphs?

Answer 25

X-axis

Question 26

What are distance/time graphs?

Answer 26

Show the distance a body travels over time

Question 27

Definition of gradient

Answer 27

The slope of a graph at a particular moment in time

Question 28

How do you calculate gradient?

Answer 28

chance in y axis / change in x axis

Question 29

In a distance/time graph what does the gradient indicate?

Answer 29

The speed of a body at ant point and will show whether the body is at rest, constant speed, accelerating or decelerating

Question 30

How can you calculate speed from a distance/time graph?

Answer 30

Speed = distance / time

Question 31

Will a distance/time graph go down?

Answer 31

No, as distance will only increase because it is a measure of size only

Question 32

What is the distance/time graph for rest?

Answer 32

Question 33

What is the distance/time graph for constant speed?

Answer 33

Question 34

What is the distance/time graph for acceleration?

Answer 34

Question 35

What is the distance/time graph for deceleration?

Answer 35

Question 36

What does a speed/time graph show?

Answer 36

The speed of a body overtime

Question 37

What does the gradient show for a speed/time graph?

Answer 37

The acceleration of a body at a particular instant and will show whether the body is at rest, constant speed, accelerating or deceleration

Question 38

What is the speed/time graph for constant speed?

Answer 38

Question 39

What is the speed/time graph for acceleration?

Answer 39

Question 40

What is the speed/time graph for deceleration?

Answer 40

Question 41

How can you measure distance from a speed/time graph?

Answer 41

Measured as an area under the speed/time curve

Question 42

What does a velocity/time graph show?

Answer 42

The velocity of a body over time

Question 43

What does the gradient of a velocity/time graph show?

Answer 43

The acceleration at a particular instant, shows if the body is at rest, uniform velocity, accelerating or decelerating

Question 44

Explain what is shown by the line above and below the horizontal line in a velocity/time graph?

Answer 44

Above - movement away from the start point Below - movement back towards the starting point

Question 45

Explain what is happening at each point on this velocity/time graph?

Answer 45

A-B - Ball is hit, stick applies force to the ball, acceleration occurs, increasing velocity B-C - Maximum velvety is reached as ball leaves the stick. Uniform velocity C-D - Rapid deceleration, decreasing velocity as ball hits the post D - Velocity is 0, the ball has become stationary D-E - Acceleration, increasing velocity in the opposite direction. Ball changes direction during the rebound, post applies a force to the ball. At point E the ball has maximum velocity in the new direction

Question 46

Relate A-B this velocity/time graph to newtons laws

Answer 46

Newtons 1st law: the player applies a large external force to the ball causing a change in state of motion Newtons 2nd law: The larger the force applied by the stick to the ball, the greater the acceleration towards the goal

Question 47

Relate B-C on this velocity/time graph to newtons laws

Answer 47

Newtons 1st law: Opposing forces are balanced, net force = 0/ there is not net force acting on the ball

Question 48

Relate C-D on this velocity/time graph to newtons laws

Answer 48

Newtons 3rd law: The ball apples are force to the post, the post applies an equal and opposite reaction force on the ball, causing it to change shape of motion

Question 49

Relate D-E on this velocity/time graph to newtons laws

Answer 49

Newtons 3rd law: The post applies are reaction force to cause a change in state of motion of the ball in the opposite direction

Question 50

Explain what is happening at each point of this velocity/time graph showing the motion of a ball being passed between two players

Answer 50

A-B - Acceleration, player A applied a force to accelerate the ball towards player B B-C - Deceleration, player B cushioned the ball towards decrease it to a resting position at point C C-D - Rest, player B controls the ball and prepares to return the pass D-F - Acceleration followed by deceleration in the opposite direction, player B applies a force to the ball, accelerating it back to player A who cushions the ball, decelerating it

Question 51

Is angular motion or linear motion more common in sport and why?

Answer 51

Angular motion is more common due to friction and air resistance