Kinematics 1

Question 1

Define distance (3)

Answer 1

-scalar quantity
-measurement of the physical separation between 2 points
-SI unit = Metres

Question 2

Define displacement (2)

Answer 2

-vector quantity
-the distance of an object from a fixed point in a specified direction

Question 3

What does scalar quantity mean (1)

Answer 3

-quantity that only has magnitude

Question 4

What does vector quantity mean (1)

Answer 4

-quantity with both magnitude and direction

Question 5

Define speed and state its formula (3)

Answer 5

-total distance travelled per unit time
- distance/time
-SI unit = m/s

Question 6

Define average speed (3)

Answer 6

-the total time travelled divided by the total time taken
-at any moment in time the actual speed is not necessarily equal to the average speed
Total distance / total time

Question 7

Define instantaneous speed (2)

Answer 7

-actual speed occurring at one instant in time
SI unit = m/s

Question 8

State the conversion from m/s to km/hr and vice versa (2)

Answer 8

M/s to km/hr x3.6
Otherwise divide

Question 9

State the conversion from m/s to mph and vice versa (2)

Answer 9

M/s to mph x2.24
Otherwise divide by 2.24

Question 10

Define velocity (2)

Answer 10

-the rate of change in displacement of an object
V = DISPLACEMENT / TIME

Question 11

When a runner runs a 200mtr race the speed may be constant but what happens to velocity (3)

Answer 11

-speed may be constant but the direction changes
-the direction of the velocity arrow changes
-hence velocity isn’t constant

Question 12

Define acceleration (4)

Answer 12

-vector quantity
-rate of change in velocity
-SI unit = m/s2
V-U/t

Question 13

What would the gradient of a distance time graph be (1)

Answer 13

Velocity

Question 14

What would the gradient of varying velocity graph be (1)

Answer 14

-gradient of tangent would be the instantaneous velocity

Question 15

How to find average velocity from the varying velocity graph (1)

Answer 15

-gradient betwen 2 points
Example: t1 and t2

Question 16

State what the gradient gives in a velocity time graph (1)

Answer 16

Acceleration

Question 17

What would the gradient of varying acceleration graph be (1)

Answer 17

Gradient of tangent would be instantaneous acceleration

Question 18

How would you be able to find the average acceleration from the varying acceleration graph (1)

Answer 18

Gradient between 2 points

Question 19

What does the area under the velocity curve give

Answer 19

Distance travelled