3.1: Motion, F Flashcards
Define: Speed
Distance per unit time
Define: Displacement
Distance moved in a particular direction from a point of reference
Define: Velocity
Displacement per unit time
Define: Acceleration
Change in velocity per unit time
How many forces are acting on a object in free fall, and what are the forces
1 , weight
How does the horizontal velocity of a projectile change with time
It remains constant as the horizontal and vertical components are completely independant
What is given by the slope of a displacement-time graph
Acceleration, if it accelerates at a uniform rate = gradient will be constant
What is given by the gradient of a displacement-time graph
Velocity = change in displacement / change
in time
How would you find the average velocity over a period of time
Divide the final change in displacement / final change in time
(Regardless of curve or not)
What is given by the gradient of a velocity-time graph
Acceleration
What is given by the area under a velocity-time graph
Displacement
as distance travelled = avg speed x time
Name 2 factors that affects thinking distance
Any 2 of:
- Tiredness
- Alcohol/drug use
- Illness
- Distractions
Name 2 factors that affect braking distance
Any 2 of:
- Braking force
- Friction
- Mass
What is the formula for calculating stopping distance
Thinking distance + Braking distance = Stopping distance
