Linear motion

Question 1

Linear motion (definition - 2 points)

Linear motion using Amy as an example:

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

In the final straight Amy Williams is travelling at top speed all her body parts are travelling in the same direction at the same distance per unit of time.

Question 2

Linear motion is due to: (1 thing)

What does Newton’s first law suggest?

Answer 2

• Direct force being applied to the body, where the force is applied directly to the centre of a body of mass

Newton’s first law suggests an uninterrupted body will continue to travel in a linear motion indefinitely.

Question 3

Linear motion descriptors

Answer 3

Distance

• how for something travels

Displacement

• shortest route that can be taken between A and B

Speed

• distance travelled divided by amount of time

Velocity

• rate of change in displacement /time

Acceleration/Deceleration

• rate of change of velocity

Question 4

Velocity time graphs

The graph shows…?
Gradient of the curve indicates …? It will show whether the body is: (4)

A velocity/time graph can also… A negative curve…

The velocity time graph attached represents each type of motion between: (talk about in between each letter)

Answer 4

• Visual representation of the velocity of motion plotted against the time taken
• Gradient of the curve indicates the acceleration of the body at a particular instant
• Will show whether the body is:

     a) At rest
     b) Travelling with uniform velocity
     c) Accelerating
     d) Deceleration

A velocity/time graph can also show any change in direction a body makes. A negative curve below the horizontal axis represents a change in the body’s direction.

    1) Points A-B (acceleration) Player A applied a force to accelerate the ball towards Player B
    2) Points B-C (deceleration)*. Player B cushions the ball to decelerate it to a resting position at point c
    3) Points C-D (rest). Player B controls the ball and prepares to return the pass
    4) Points D-E (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 to rest. 

• downward curve represents a decrease in velocity per unit of time