Topic 1 Key Concepts In Physics

Question 1

What are the prefixes?

Answer 1

Giga-G-10to the power of 9, Mega-M-10to the power of 6, Kilo-K-10to the power of 3
Centi-c-10to the power of -2, Milli-m-10to the power of -3, Micro-upside down h-10to the power of -6, Nano-n-10to the power of -9

Question 2

What are Scalar and vector quantities?

Answer 2

Scalar: size, magnitude and no direction
Vector: size, magnitude and a specific direction
Scalar: mass, speed, distance
Vector: force, velocity, acceleration

Question 3

Speed, distance time
Distance time graphs

Answer 3

Distance= speed x time
Going in a straight line up = constant speed
Going in a slope upwards = acceleration
Going in a slope upwards but then curving back down = deceleration
A straight line across = stationary

Question 4

Equations acceleration and velocity

Answer 4

Acceleration= change in velocity / time
A=(v-u)/t
Velocity= final velocity-initial velocity=2 x acceleration x distance
V(squared)- u(squared)= 2 x a x X

Question 5

Velocity/time graphs

Answer 5

The slope or gradient of the graph tells us the acceleration of the vehicle
The area under the graph tells us the distanced travelled
Acceleration = change in velocity/ time