Physics - Work and Energy

What is the definition for work?

When a force acts upon a body energy is transferred.

objects can possess motion due to:

• motion - kinetic energy

• position - gravitational potential energy

• deformation - elastic potential energy

What is Hookes law?

force and extension are directly proportional

What is the equation for Hookes law?

F = kx

F = force

K = spring constant

X = extension

what is elastic deformation?

returns to original shape

what is inelastic deformation?

stays deformed

why are car safety features designed?

to increase the distance over which energy is transferred.

what are some car safety features?

• crumple zone

• seatbelt

• airbags

force acting on body is..

inversely proportional to time taken

car safety features decrease the force on the driver avoiding what?

the risk of serious injury or death

how to reduce inertial losses?

making cars lighter - decreases mass and reduces its inertia

how to reduce aerodynamic losses?

streamlining to allow air to move more smoothly over external forces

how to reduce idling losses?

start - stop systems that monitor the system and shut it down when at traffic lights