Newtons Laws
What does Newton's first law state?
An object in motion will remain in motion until acted on by an outside or unbalanced force.
_____ keeps your car moving until a force slows it down or stops it.
Inertia
Reaction Distance + Braking Distance = _________
Stopping Distance
Why can humans lay on a bed of nails without getting injured? (hint: it's not magic!)
The force is produced by a person's weight that is distributed over many nails on the nail bed. How the force is distributed is the pressure. Therefore a person can do this safely if there are a large number of nails.
To improve your traction in turns __________ were created.
Banked Roadways
Who actually discovered Newton's First Law?
Galileo
If you go around a turn/corner too fast, the strong resistance will force your car's inertia to.....?
Travel in a straight line. The friction between the tires and the road will not provide enough centripetal force. This will cause your car to continue in a straight line due to inertia.
The distance your car travels from the time your brakes are applied until you come to a complete stop is called ________.
Braking Distance
Can seatbelts cause injuries? Why?
Yes. They can in some instances. It really depends on how severe the crash is, and if you are wearing your belt correctly. The force of the crash is distributed throughout your body by pushing against the seatbelt while it pushes against you.
What type of force causes acceleration?
Unbalanced Force
If your foot presses on your brake, your brake also exerts an equal and opposite force on your foot. What is this an example of?
Newton's Third Law
When driving uphill gravity will pull your car ______.
Backward, slowing it down.
When you double the speed of your car, your braking distance_______?
Quadruples
Calculate the pressure caused by a car weighing 2,871 pounds if each tire has a bottom area of 10in².
Force = 2,871 pounds
Area = 10in² x 4 tires = 40in²
Pressure= F/A
2,871pounds/40in²
=71.78 psi
_______ describes the resistance that exists between two surfaces in contact that slide against each other.
Friction
Which one of Newton's Laws explains why in a collision a car not only damages what it collides with but obtains damage itself.
Newton's Third Law
Why does a car naturally move outward when going around a turn?
The car's inertia doesn't want to continue in the circular inward motion.
How much time should you allow between your vehicle and the vehicle in front of you and why?
Three full seconds. This rule gives you extra time to react in case the car in front of you makes a sudden turn, stops quickly, or if the roads are bad.
When driving, both you and your vehicle gain momentum which is _______ to the mass of your car and the speed it travels at.
Proportional
The tendency for objects to be outwardly pulled when rotating around a center.
Centrifugal force
According to Newton's 3rd Law, when a car hits a person, a person.....?
Hits the car
The heavier/more massive a vehicle is the _____ the inertia is.
greater
John's car has a mass of 2,000kg. It is pushed forward with a force of 4,000 Newtons. At what rate does his car accelerate?
N=4,000
kg=2,000
N/kg = A
4,000N/2,000kg = 2 m/s²
Centrifugal and centripetal forces effect obejcts that travel on _________ paths.
Curved
A car traveling down a flat road in neutral will gradually slow down. Why?
Friction. As the car travels, the friction between the tires and the road will slow the car down.