Kinematics

Question 1

Define a vector

Answer 1

A vector is a physical quantity that had both magnitude and direction. Examples include: displacement, forces, acceleration, and velocity

Question 2

Define a scalar

Answer 2

A scalar is a physical quantity that has magnitude only. Examples are: mass, speed, time and distance

Question 3

Define resultant vector

Answer 3

A resultant vector is a single vector which has the same effect as the original vectors acting together

Question 4

Define distance

Answer 4

Distance is the length of path travelled

Question 5

Define displacement

Answer 5

Displacement is a change in position. It points from the initial to the final position

Question 6

Define speed

Answer 6

Speed is the rate of change of distance

Question 7

Define velocity

Answer 7

Velocity is the rate of change of position or the rate of change of displacement

Question 8

Define acceleration

Answer 8

Acceleration is the rate of change of velocity

Question 9

Vertical projectile motion

Answer 9

Projectiles fall freely with gravitational acceleration of 9.8ms^-2

Projectiles take the same amount of time to reach their greater height from the point of upward launch as the time they take to fall back to the point of launch

Question 10

Graphs of motion: for either horizontal or vertical motion with constant acceleration

Answer 10

There’s 3 graphs:
1. Position vs time graph
2. Velocity vs time graph
3. Acceleration vs time graph

Question 11

Interpret graphs of motion

Answer 11

1. The gradient of a position vs time graph is VELOCITY
2. The gradient of a velocity vs time graph is ACCELERATION
3. The area under the graph of the velocity vs time graph is DISPLACEMENT

Question 12

Equations of motion

Answer 12

1. vf = vi + at
2. vf^2 = vi^2 + 2ax
3. x = (vf + vi / 2)t
4. x = vi t + 1/2 a(t)^2