1. EQUATIONS P2 Topic 4: Momentum, energy, work and power
This topic looks at:
Stopping distances
Momentum
Vehicle Safety
Work and Power
Potential and Kinetic energy
Calculate the kinetic energy of the van.
When the car stops, what type of energy is the kinetic energy transferred into?
Define the terms:
Stopping Distance
Thinking Distance
Braking Distance
Vector Quantity
What is the momentum of the van?
momentum (kg m/s) = mass (kg) × velocity (m/s)
kinetic energy = ½ x mass x velocity2
Keywords: seat belt, airbag, crumple zones, gravitational potential, kinetic
EQUATIONS
What is the unit for energy?
What type of energy is the gravitational potential energy changed into when the skateboarder leaves the top of the ramp?
The ramp is 5m high and the skateboarder is 50kg. Calculate her potential energy.
What safety/protective features are vehicles fitted with and how do they affect the rate of change of momentum?
The boy pushes the crate 20m across the floor. Calculate the work done.
Keywords: Work, power, momentum, vector quantity, stopping distances, braking distances, thinking distances