Motion Flashcards
What is stopping distance?
thinking distance + braking distance.
What is thinking distance?
The reaction time of a driver
What is braking distance?
The distance the vehicle travels when braking until it comes to a full stop.
What is thinking distance affected by?
tiredness, drugs, and alcohol.
What is braking distance affected by?
road conditions, weather conditions, and the condition of the vehicle.
What happens when a force is appiled to the brakes of a vehicle?
work done by friction between the brake and the wheel reduces kinetic energy and the temperature of the brakes increase.
What is ‘Momentum’?
How difficult it is to stop an object from moving. It is affected by mass and velocity.
What is the conservation of momentum?
the total momentum before an event and the total momentum after an event are the same.
What is Terminal Velocity?
the air resistance will increase to the same size as gravity. The forces will balance and will make the object travel at a constant velocity.
What is the changing force on a constant mass practical?
Add equally spaced chalk lines onto a bench (20cm apart)
Put a toy car at one end of the bench, and attach a weight stack using string with a pulley at the other end.
Add 10g to the weight stack.
Release the toy car and time how long it takes for the car to reach the end.
Repeat.
What is the changing mass with a constant force practical?
Add equally spaced chalk lines onto a bench (20cm apart)
Put a toy car at one end of the bench, and attach a weight stack using string with a pulley at the other end.
Add 10g on top of the car, release it and measure how long it takes to travel to the end.
How to calculate acceleration?
distance/(time)^2
