Kinematics 2

Question 1

Equations of motion values

Answer 1

Distance
Displacement (s)
Speed 
Velocity (v)
Acceleration (a)

Question 2

Distance

Answer 2

The distance travelled by an object is a scalar quantity and describes the amount of ground the object has covered.

Question 3

Displacement (s)​ - ​

Answer 3

The overall distance travelled from the starting position (includes a direction and so it is a vector quantity).

Question 4

Speed​ -​

Answer 4

This is a scalar quantity which describes the distance travelled per unit time.

Question 5

Velocity (v)​ -

Answer 5

​rate of change of displacement - Δs/​Δt

Question 6

Acceleration (a) -

Answer 6

rate of change of velocity - Δv/Δt

Question 7

What is uniform acceleration

Answer 7

Uniform acceleration​ is where the acceleration of an object is constant.

Question 8

what do acceleration-time graphs represent

Answer 8

Acceleration-time graphs​ represent the change in velocity over time. Therefore the ​area under the graph is change in velocity​

Question 9

What do velocity time graphs represent

Answer 9

Velocity-time graphs​ represent the change in velocity over time. Therefore the ​gradient of a velocity time graph is acceleration​, and the ​area under the graph is displacement​.

Question 10

what do displacement-time graphs represent

Answer 10

Displacement-time graphs​ show change in displacement over time, and so their ​gradient represents velocity.

Question 11

What is instantaneous velocity

Answer 11

Instantaneous velocity​ is the velocity of an object at a specific point in time. It can be found from a ​displacement-time graph​ by drawing a tangent to the graph at the specific time and calculating the ​gradient

Question 12

how are distance and speed represented

Answer 12

Distance and speed can be represented in distance-time graphs and speed-time graphs respectively. Note that unlike displacement and velocity, distance and speed ​will never be negatives they are ​scalar​ values

Question 13

What happens when an object is moving at constant velocity

Answer 13

When an object is moving at a ​constant velocity​ in one direction, and experiences a ​uniform acceleration in the perpendicular direction​, it will follow a ​parabolic​​shape, as shown in the diagram to the right.

At first, the object only experiences a horizontal velocity (v​x​), however as time goes on, its vertical velocity (v​y​) increases due to the uniform acceleration. This causes the object to ​change direction​, and as the time passed increases, the degree by which the direction has changed increases, as shown by the ​parabolic shape​.