Motion

Question 1

Displacement, distance time graph

Answer 1

The gradient is velocity/speed
Change in y axis/changein x axis
Straight line not horizontal means constant speed
Negative gradient is returning to the starting point
Horizontal line means its stationary (doesn’t move)
A curved line means acceleration, remember acceleration is the change in speed

Question 2

velocity/speed time graph

Answer 2

The gradient is acceleration
Negative gradient is deceleration
Slope means changing acceleration, this could be in an increasing rate or decreasing
So constant acceleration will be a constant gradient
A horizontal line means constant speed/velocity (no acceleration)

The area under the line is the distance travelled
(Triangle)

Question 3

Projectiles

Answer 3

The greater the speed of projection, the greater the range

Question 4

Speed

Answer 4

Speed is the distance moved by an object each second. (How fast an object moves)

Remember: scalar is the magnitude (a number describing how big u are) for example, time, energy, speed

Speed=distance/time

Question 5

Acceleration

Answer 5

The rate of something speeding up or slowing down
The rate of change of velocity

Acceleration is always constant when free falling (no air resistance)

Final speed - initial speed(change in velocity) /t
(v-u/t)

However there is more equations
V - final time
U - initial time
A - acceleration
T - time

V = u + at
S = (u + v)/2 x t
V = u^2 + 2as

Deacceleration- Decreasing the change of speed (velocity), negative acceleration

Question 6

Velocity

Answer 6

A vector quantity, a speed in any given direction
The rate of change of displacement (displacement being seeped in any given direction)

Remember: vector is the magnitude AND the direction an example of this is force, acceleration, weight etc

Velocity= Displacement/time
Displacement- the change of distance
If you go to A to B but go back to A then displacement is 0 since you never moved away from your starting point