Ch 9 REVIEW, Natural Laws

What is GRAVITY?

• Force pulling all objects up

• Force pulling all objects to center of earth

• Point at which an object's weight is evenly balanced

• none of the above

What is Center of Gravity?

• Force pulling all objects to center of the earth

• point at which an object's weight is evenly balanced

• point at which an object will go off the road when making a turn

• always middle of the object

What is the leading type of collision for your age group?

• Head on collisions

• Rear end collisions

• Single vehicle, off the road collisions

• none of the above

An empty semi truck, traveling 25 miles per hour (mph) needs 15 feet to stop, estimated.

What happens if you double the SPEED?

• 2 times

• 3 times

• 4 times

• 9 times

An empty semi truck needs 15 feet to stop if traveling 25 miles per hour.

What happens if you double the WEIGHT?

• 2 times

• 3 times

• 4 times

• 9 times

An empty semi truck needs 15 feet to stop (if traveling 25 miles per hour).

What happens if you double the weight and speed?

• 2 times

• 3 times

• 4 times

• 9 times

Friction as a gripping action:

What are the 3 types of Friction for driving?

(click all that apply)

• rolling

• sliding

• falling

• standing

Friction between the roadway and the tires is called?

• Traction

• Inertia

• Static

• Braking

An over inflated tire wears where?

• Outside edges

• middle

• on the right side only

• on the left side only

an under inflated tire wears where?

• outside edges

• middle

• right side only

• left side only