Physics Unit 3 - Forces Flashcards
What is the equation that connects distance, speed, time?
Distance = speed x time
Speed = distance / time
Time = distance / speed
What methods can be used to measure the speed of moving objects?
1) Using the light gate to measure the time it take for and object to move from A to B.
2) Using a stopwatch to pass over a known distance.
What is instantaneous speed
Speed of the object at the time it was measured
What is the average speed?
Total distance divided by the total time it took to complete the journey
What is a force
Push or pull that acts on an object
What effects do forces have on an object?
Change its speed of motion
Change the direction of motion
Change of the shape of the object
When an object is moving at a constant speed what does that mean?
Resultant force is 0 so object is either at rest or moving at a constant speed/ velocity
What is a resultant force
Is a single force that has the overall effect of all of the forces acting on the object
What equation links force, mass and acceleration
Force = mass x acceleration
What does it mean for the object if the forces are balanced
Resultant force is zero so object remains at rest or continues at a constant speed
What is the stopping distance
The distance travelled by the car from the second the driver realises the need to stop and the car becoming stationary
What are the components of the stopping distance
Thinking distance
Braking distance
How is the stopping distance calculated
Thinking distance + braking distance
What is the thinking distance
The distance travelled by the car from the second the driver realises the need to stop and pressing the pedal
What is the braking distance
The distance travelled by the car from the driver pressing the brake and the car becoming stationery
