P2.2 The Kinetic energy of Objects Speeding Up or Slowing Down Flashcards
Define Elastic potential energy.
Stored in the object when work is done on the object to change its shape.
Describe the relationship between force and extension in Hookes Law?
The extension of a spring or wire is directly proportional to the force acting on it.
Define work done.
When a force causes an object to move through a distance work is done.
Define gravitational potential energy.
Is energy that an object has due to its position in a gravitational field.
What is regenerative braking?
A process where a car’s kinetic energy is transferred to electrical energy to slow the car down.
What 2 factors make up the overall stopping distance of a car?
Thinking distance.
Plus.
Braking distance .
State 3 factors that will increase the braking distance of a car.
Speed.
Worn brakes.
Worn tyres.
Poor condition of road.
State 3 factors that will increase the thinking distance of a car.
Speed.
Tiredness.
Alcohol.
Drugs.
State the conservation of momentum.
The momentum before the collision will be the same as the momentum after the collision.
Explain how all of the following safety features act to reduce injury, air bag, crumple zones, seatbelt.
Increase the time taken for the object to stop thereby reducing the rate of change of momentum.
Define power.
Energy transferred per second.
What is one Watt equal to?
1 Joule per second.
