P2 part 1 Flashcards
What is work done?
The amount of energy used.
How does friction affect work done?
It increases work done.
What is gravitational potential energy?
The energy stored in an object in a gravitational field.
What is kinetic energy?
The energy stored in a moving object.
What features do we add to cars to make them safe?
- Air bags
- Seat belts
- Bumper on the front (crumple zone)
What is momentum?
The quantity of mass x velocity. It has size and direction.
What is the conservation of energy?
If two objects collide, their total momentum before the collision is equal to the total momentum after the collision.
What is the definition of a force?
A push or pull action, it has direction, so it is a vector.
What are balanced forces and when do they occur?
When forces acting on something cancel each other out.
What are unbalanced forces and when do they occur?
When the forces are not equal to each other.
What is terminal velocity?
When you can’t go any faster, except if you become more streamlined. It happens when the forces are equal.
What is Hooke’s law?
The force put on a spring is directly proportionate to the extension.
What is stopping distance?
The time it takes for a driver to react and apply breaks to stop.
What are the two things that affect stopping distance?
- Thinking distance
- Braking distance
What factors affect stopping distance?
- Drinking distance
- Torn brakes
- Friction on the road
