Kinematics

Question 2

What are the 2 kinematic equations you need to memorize?

Answer 2

v= u+at
s=1/2(u+v)t

Question 3

Definition of distance

Answer 3

Distance is the total length covered by an object irrespective of the direction of motion.

Question 4

Definition of displacement

Answer 4

Displacement is the change in the position of the object relative to its initial position.

Question 5

Is distance a scalar or vector quantity?

Answer 5

Scalar

Question 6

Is displacement a scalar or vector quantity?

Answer 6

Vector

Question 7

What is the SI unit of distance?

Answer 7

metre(m)

Question 8

What is the SI unit of displacement?

Answer 8

metre(m)

Question 9

A car travels 3.0km due east from point O to A and then a further 3.0km due north of A. Determine the distance covered and its displacement.

Answer 9

Distance: 6.0km
Displacement:4.2km(2sf)

Question 10

Definition of speed

Answer 10

The speed of an object is defined as the rate of change of its distance travelled with respect to time.

Question 11

Definition of velocity

Answer 11

The velocity of an object is defined as the rate of change of its displacement with respect to time.

Question 12

Is speed a scalar or vector quantity?

Answer 12

Scalar

Question 13

Is displacement a scalar or vector quantity?

Answer 13

Vector

Question 14

What is the SI unit of speed?

Answer 14

metre per second(m s^-1)

Question 15

What is the SI unit of velocity?

Answer 15

metre per second(m s^-1)

Question 16

Definition of instantaneous speed

Answer 16

Instantaneous speed of an object at a particular instant is the rate of change of distance with respect to time at that instance.

Question 17

Definition of instantaneous velocity

Answer 17

Instantaneous velocity of an object at a particular instant is the rate of change of displacement with respect to time at that instance.

Question 18

How do you know if a body is said to be moving with constant velocity?

Answer 18

A body is said to be moving with constant velocity if the displacement changes at a constant rate.

Question 19

Definition of acceleration

Answer 19

The acceleration of an object is defined as the rate of change of its velocity with respect to time.

Question 20

Is acceleration a scalar or vector quantity?

Answer 20

Vector

Question 21

What is the SI unit of acceleration?

Answer 21

metre per second squared

Question 22

How do you find the average acceleration?

Answer 22

Change in velocity/Total time taken

Question 23

How do you find instantaneous acceleration?

Answer 23

dv/dt

Question 24

3 reasons why there can be a change in velocity

Answer 24

1)A change in magnitude
2)A change in direction
3)A change in both magnitude and direction simultaneously

Question 25

What is the acceleration of free fall on the Earth's surface?

Answer 25

9.81 m s^-2

Question 26

Difference between acceleration and deceleration

Answer 26

Acceleration is the change in velocity. Deceleration is slowing down.

Question 26

What does the instantaneous velocity mean in the displacement-time graph?

Answer 26

Gradient of the tangent at a point on the graph

Question 27

What does it mean when the tangent is steeper in a displacement-time graph?

Answer 27

The gradient is larger, the velocity is higher.

Question 28

What does the gradient of the velocity-time graph at any point of the velocity-time graph?

Answer 28

Instantaneous acceleration

Question 29

What does the area under a velocity-time curve give?

Answer 29

Change in displacement

Question 30

What does the are under the acceleration-time graph give?

Answer 30

Change in velocity

Question 31

Give the 3 formulas of motion

Answer 31

v = u + at v^2 = u^2 + 2as s = ut + 0.5at^2

Question 31

What is the magnitude of vector u?

Answer 31

(ux ^2 + uy^2) ^ 0.5

Question 32

How do you find the direction of vector

Answer 32

tan θ = uy/ux

Question 33

For an object projected at an angle from the ground, for the horizontal direction, what is the initial velocity?

Answer 33

ux = u cos θ

Question 34

For an object projected at an angle from the ground, for the horizontal direction, what is the velocity at the highest point?

Answer 34

vx = ux

Question 35

For an object projected at an angle from the ground, for the horizontal direction, what is the acceleration?

Answer 35

ax = 0

Question 36

For an object projected at an angle from the ground, for the horizontal direction, what is the displacement?

Answer 36

sx

Question 37

For an object projected at an angle from the ground, for the vertical direction , what is the initial velocity?

Answer 37

uy = u sin θ

Question 38

For an object projected at an angle from the ground, for the vertical direction ,what is the velocity at the highest point?

Answer 38

vy = 0

Question 39

For an object projected at an angle from the ground, for the vertical direction, what is the acceleration?

Answer 39

-9.81 m s^-2

Question 40

For an object projected at an angle from the ground, for the vertical direction ,what is the displacement?

Answer 40

sy

Question 41

For an object projected horizontally off a cliff for the vertical direction ,