Chapter 2. Kinematics

Question 1

What are the equations of motion

Answer 1

1. v = u + at
   From a = (v-u)/t
2. s = ½(u+v)t
   From average velocity = displacement/ time taken
3. s = it + ½at²
   From equation 2 replace v with v from equation 1
4. v² = u² + 2as
   From equation 2 replace t with t from equation 1

Question 2

What is the formula for acceleration?

Answer 2

Change in velocity over time taken

Question 3

What is given by the area under a velocity time graph

Answer 3

Displacement

Question 4

In parabolic motion what determines the distance traveled and what determines the time taken?

Answer 4

1. The distance traveled depends on the horizontal velocity and the time taken
2. The time of the flight depends on the vertical velocity

Question 5

Note

Answer 5

Make sure you’re able to answer questions on parabolic motion

Question 6

What is kinematic

Answer 6

Kinematics is the study of motion (regardless of the cause of the motion or the mass of the object)

Question 7

Give the four types of motion

Answer 7

1. Linear
2. Parabolic
3. Circular
4. Simple Harmonic

Question 8

Definitions

Answer 8

1. Displacement is the change in position of an object or distance moved in a particular direction from a fixed reference point. It is a vector quantity.
2. Speed is the rate of change of distance or the distance travelled per unit time. Speed is a scalar quantity.
3. Velocity is the rate of change of displacement. Velocity is a vector quantity.
   Constant or uniform velocity occurs when a body covers equal displacements in equal time intervals.
4. Acceleration is the rate of change of velocity. It is a vector.

Question 9

What does the area under an acceleration time graph represent?

Answer 9

Change in velocity

Question 10

What does it mean when an object is free fall?

Answer 10

The only force acting on the object is due to gravitational acceleration