Question

questions: (circle the correct answer)

1. in science, what is a law?

a. a rule about nature that describes how things work.
b. standards of behavior that people choose to abide by.
c. an educated guess about what may happen in the future.

1. in a wrestling match it is discovered that the athlete lied about his weight to gain an advantage over his opponent. based on what you know about inertia, how did the cheater lie?

a. he claimed he weighed less than he actually did.
b. he claimed he weighed more than he actually did.

1. which law gives us a formula for determining how much force is required to move an object?

a. first law b. second law c. third law

1. you roll a ball down a hill. the ball rolls for a distance and eventually comes to a stop. what stops the ball?

a. inertia b. acceleration c. air resistance

1. for every action, there is an opposite reaction. this statement describes:

a. newton’s first law b. newton’s second law c. newton’s third law

1. two objects are sitting at the top of a building. one object weighs 16kg and the other weighs 45 kg. which will be easier to push off the edge of the building?

a. 16 kg object b. 45 kg object c. both are equal

1. you are in a canoe on a lake and another canoe floats next to you. you use your paddle to push the other canoe away so you don’t bump. as the second canoe is pushed left, what happens to your own canoe?

a. it stays stationary b. it moves right c. it moves left also

1. the motion of the two canoes in #7, is described by newton’s _ law.

a. first b. second c. third

Explanation:

1. In science, a law is a rule about nature that describes how things work. It's a fundamental principle.
2. Inertia is related to mass. A lower - mass claim would give an advantage as it implies less resistance to change in motion. So the cheater claimed he weighed less.
3. Newton's second law ($F = ma$) gives the formula for force needed to move an object.
4. Air resistance and friction (not in options but air resistance is a factor) slow down the ball. Inertia keeps it moving and acceleration is not what stops it.
5. "For every action, there is an opposite reaction" is Newton's third law.
6. The object with less mass (16 kg) has less inertia and is easier to move.
7. According to Newton's third law, when you push the other canoe left, your canoe moves right due to the equal and opposite reaction.
8. The interaction between the two canoes is an example of Newton's third law.

Answer:

1. a. a rule about nature that describes how things work.
2. a. He claimed he weighed less than he actually did.
3. b. second law
4. c. air resistance
5. c. Newton's third law
6. a. 16 kg object
7. b. it moves right
8. c. third