MC	Physics	Standard: 01
Objective: 04. Use NewtonÍs first law to explain the motion of an object.
ILO:

A parachutist in free fall first reaches terminal velocity

a. at the time of collision with the earth

b. when the force of gravity is greater than the air resistance

c. when the force of gravity is just balanced by the air resistance

d. after the parachute is opened.

Correct Answer: c

MC	Physics	Standard: 01
Objective: 04. Use NewtonÍs first law to explain the motion of an object.
ILO:

Each of the following situations describes some kind of motion. Identify which of NewtonÍs three laws of motion might best explain the motion.

a. 1^st Law: Law of Inertia

b. 2^nd Law: F = ma

c. 3^rd Law: Action/Reaction

______ 1. A child riding without a safety restraint is propelled through the windshield of the car

when it is involved in an accident.

______ 2. Your friend lets you shoot his new shot gun and it makes your shoulder sore.

______ 3. A car on an icy road slides off the road while trying to negotiate a curve.

______ 4. After sitting in class for nearly an hour you are ready to announce that you are

suffering from tired bottom.

______ 5. A drag race is mostly all engine and tires.

______ 6. You have to walk to town after your car becomes stuck in the sand and you are

unable to push it out.

______ 7. A fighter plane uses a drag parachute to aid in stopping.

______ 8. In a fit of anger you swing your fist at the wall putting a hole in the wall and breaking

your hand.

Correct Answers:

1. a

2. c

3. a

4. c

5. b

6. a

7. b

8. c