kinematics- topic a.1

Question 1

what are SI units?

Answer 1

SI units are standardised units that all other units are derived from (made up of). They are:
Meter
Kilogram
Kelvin
Second
Mole
Amps
Candela

Question 2

What is kinematics?

Answer 2

kinematics is the study of motion without consideration to the effect of forces- an ideal situation. With known starting conditions, all future conditions can be predicted, provided that there is no change.

Question 3

What is the difference between scalar and vector quantities?

Answer 3

Scalars are quantities that describe only magnitude.

Vectors describe both magnitude and direction.
- vectors can be described by an arrow- the length describing size and the angle direction.

Question 4

how is motion described?

Answer 4

the motion of an object can be described by position, velocity, and acceleration.

Question 5

what is position?

Answer 5

position is a defined place e.g. coordinate. A change in position is known as displacement.

displacement is the area under a v-t graph.

Question 6

what is velocity

Answer 6

velocity is the rate of change of position.

velocity(ms-1)=displacement(m)/time(s)

velocity can be average or instantaneous (at one point in space and time)

velocity is the gradient of an s-t graph and the area under an a-t graph.

Question 7

what is acceleration?

Answer 7

acceleration is the rate of change of velocity

acceleration (ms-2)= change in velocity (ms-1)/time(s)

acceleration is the gradient of a v-t graph

Question 8

what are the conditions needed to use equations of motion?

Answer 8

motion must be in a straight line.

acceleration must be constant.

Question 9

what does suvat stand for?

Answer 9

s- displacement
u- initial velocity
v- final velocity
a- acceleration
t- time