CORRECT Answers
1. Inertia The tendency of an object to resist a change in motion.
Example: a vehicle will continue moving in a straight line until an external force
(turning the steering wheel) alters its course.
2. Gravity is an invisible force that pulls objects toward the ground.
Example: changes in a vehicles center of gravity (braking or accelerating) will
impact vehicle handling control.
3. kinetic energy is the energy an object possesses by being in motion.
Example: the kinetic energy in a vehicle going 10 MPH would be equal to 100 units.
The same vehicle going 40 MPH has four times the speed but 16 times the force
(1600 units) acting on the vehicle.
Example: to reduce vehicle speed, kinetic energy must be converted into heat
generated by brake pads against the rotors and tires against the road surface.
4. Momentum amount of motion and property of a moving body that determines the length of
time required to bring it to rest.
NOTE: As a vehicle's momentum increases, its stopping distance and kinetic energy
increases.
5. Friction and 3 is the force between two bodies that resist motion or tendency to motion.
types Sliding (skidding) friction- occurs when the vehicles wheels are locked and sliding
across pavement.
Rolling Friction- The vehicles front tires must be rolling to steer.
Static friction- a table on the floor or a vehicle stationary on the pavement.
6. Centrifugal force is a force that tends to move an object AWAY from the center in a system undergo-
ing circular motion.
Occurs when a vehicle enters a corner or curve, but as steering input occurs from
the driver, the vehicle fails to turn and continues straight.
7. centripetal force is the force on a body in a curved motion that is directed Toward the center axis or
, rotation.
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