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Homework – Newton’s Laws
1. Amyx is building a tree house in his backyard. He notices that every time he strikes a nail with the hammer, the hammer bounces back just a little bit as the nail goes farther into the wood. This is because when the hammer strikes and exerts a force on a nail, the nail…
a. creates a balanced force
b. exerts an equal and opposite force back on the hammer
c. is struck and won’t go any further into the wood
d. disperses the force of the impact throughout the wood
2. 2. Billy is sitting in a chair in class. If the action force is the downward push of his weight on the chair, what is the reaction force?
a. gravity
b. the upward force of the Earth on Billy
c. there is no reaction force
d. the upward force of the chair pushing on Billy
3. 3. Reggie accidentally left his books on top of his car before he left for class. The books stayed on top of his car while he was driving north on Oak Avenue. Then, when he made a sharp turn eastward onto Harris lane, his books fell off the top of his car and onto the street.
Which of the following best explains why Reggie’s books fell?
a. The people that live on Harris Lane hate reading, which caused the books to fall.
b. When Reggie’s car turned eastward, his books continued moving northward, causing them to slide off the top of his car.
c. The force of gravity caused Reggie’s books to slide across the top of his car and fall.
d. Heat energy from the sun caused Reggie’s books to slide off the top of his car and fall.
4. 4. Newton’s first law of motion states that an object will keep a constant velocity unless acted upon by an unbalanced force.
To test this statement Martin rolled a ball on a long, level street. the ball did not bump into any object, but it eventually came to a stop. How is this possible?
a. Newton’s first law of motion only holds true in space, not on Earth
b. The unbalanced force that caused the ball to stop was friction.
c. Martin did not roll the ball hard enough, which caused the ball to eventually stop.
d. Every moving object must come to a stop because energy cannot be destroyed.
5. Ashley made a paper airplane. When she threw the airplane in the house, it always flew straight where she aimed. Now she wants to throw the plane to her pet dog, Scruffy, who is in the backyard. There is a steady wind blowing East.
A diagram of Ashley’s backyard is shown above. If she aims her throw directly at Scruffy, where is the paper airplane most likely to end up?
A. at the grill
B. at the tree
C. in the pool
D. at Scruffy
6. The Earth exerts a pull on the Mood through its gravitational force. According to Newton’s 3rd law of motion, the Moon must also be exerting a pull on the Earth. Which of these observations is evidence of the Moon’s pull?
A. From the Earth, the visible face of the Moon is always the same.
B. Earthquakes originate at locations where Earth’s crustal plates meet.
C. Earth’s high tides are highest closet to and farthest from the location of the Moon.
D. The cycle of the phases of the Moon seen from Earth lasts about a month.
7. What does the use of a seat belt in a vehicle have to do with Newton’s First Law of Motion?