Physics

Question 1

Distance

Answer 1

A measurement of how far apart objects are
Scalar quantity- has a size but not a direction
distance = average speed x time D= v x t

Question 2

Gradient

Answer 2

Slope of a hill of a graph: gradient = rise

run

Question 3

Speed

Answer 3

The rate of change of distance
Average speed=distance v=d
time t
d=s x t OR t= d
s
Final speed=initial speed+(average acceleration x time taken) v=u + at

Question 4

Velocity

Answer 4

The rate of change of displacement
Average velocity=change in displacement
time

Question 5

Acceleration

Answer 5

Rate of change in velocity
a=v-u
t

Question 6

Inertia

Answer 6

The tendency of an object to resist changes in its motion

Question 7

Newtons 1st law of motion

Answer 7

An object at rest will remain this way unless it is acted upon by an unbalanced force; an object that is moving will continue to move in the same manner unless acted upon by an unbalanced force

Question 8

Newtons 2nd law of motion

Answer 8

An object will accelerate in the direction of an unbalanced force acting upon it such that : F= m x a
(Force=mass x acceleration)

Question 9

Newtons 3rd law of motion

Answer 9

For every action, there is an equal and opposite reaction

Question 10

Displacement

Answer 10

a straight line connecting the start and end points that is specified in terms of length and direction
Vector quantity- has both size and direction

Question 11

Speed time graph

Answer 11

Area- distance travelled
Gradient = acceleration 
Constant moving- shown by flat line
Increasing speed- graph rising upwards
Decreasing speed- graph falling downwards

Question 12

Displacement time graph

Answer 12

^ displacement

-> time

Question 13

Converting units

Answer 13

M/s (x 3.6) -> km/h

Km/h (/3.6) -> m/s

Question 14

Time tickers

Answer 14

5 dots = 0.1 seconds
The ticker vibrates up and down 50 times every second.
Constant speed- dots are evenly spaced
Accelerating- space between dots increases
Decelerating- spacing between dots decreases

Question 15

Distance time graph

Answer 15

Steep line- fast
Straight horizontal line- not moving
Lower sloped line- slow

Question 16

Acceleration due to gravity

Answer 16

9.8 m/s^2
Friction between air and a moving object will slow down large rates of acceleration (air resistance) 
Final velocity (terminal velocity)

Question 17

Human tolerance of g-forces

Answer 17

Depend on: how big the forces are, how long they last, the direction in which they act and the part of the body they affect.
Can be dangerous in the vertical drop as blood flow to the brain can be disrupted and cause loss of consciousness or death.

Question 18

Force and acceleration calculations according to newtons law

Answer 18

F= m x a
m= F
      a 
a=F
    m