|
|
|
1.
|
3rd Law QuestionThe diagram below shows a 5.00 kg block at
rest on a horizontal, frictionless table. Gravity is acting on this block, and the acceleration of
gravity on Earth is 9.807 m/s 2. Which of the following diagrams
best represents the force exerted on the block by the table?
|
|
|
2.
|
3rd Law Question
A mosquito flying over a highway strikes the
windshield of a truck traveling at a speed of 100 kilometers per hour (62 miles per hour).
Compared to the force magnitude of the truck on the mosquito during this collision, the force
magnitude of the mosquito on the truck is...?
a. | the magnitude is somewhat less. | b. | the magnitude is significantly
greater. | c. | the magnitude is exactly the same | d. | the magnitude is significantly
less. |
|
|
|
3.
|
3rd Law QuestionBoth dogs in the picture below have the same
mass, and they both are exerting the same amount of force on the rope toy, What is most likely to happen when the rope
toy breaks in the middle as a result of the forces the dogs are exerting?
a. | As the two dogs are the same mass, neither dog will be thrown
backwards. | b. | The breaking of the rope toy will create unbalanced forces that only affect one of
the dogs, causing one dog to be thrown backwards. | c. | One dog will be thrown backwards while the
other dog will be able to move forwards. | d. | The dogs will be thrown backwards, in opposite
directions from each other, the same distance. |
|
|
|
4.
|
3rd Law QuestionA science teacher did a demonstration by
dropping two balls together at the same time with the smaller ball resting on the larger ball.
Immediately after the larger ball impacted the floor, the smaller ball was launched upwards. Two-Part
QuestionPart 1: What caused the smaller ball to accelerate upward at such a high
rate? Part 2: Would this same phenomena occur if you used two identical basketballs?
a. | Part 1: The density of the smaller ball reacted with the density of the larger
ball.
Part 2: Another basketball would not reach the same acceleration as the small
ball. | b. | Part 1: The action/reaction effect launched the smaller ball
upwards.
Part 2: A basketball would not reach the same velocity that the small ball
did. | c. | Part 1: The difference in volume caused the smaller ball to
accelerate.
Part 2: Basketballs have a greater mass. Therefore it would have more
momentum. | d. | Part 1: The smaller ball traveled with a higher velocity downwards.
Part 2: The basketballs would not reach the same velocity. |
|
|
|
5.
|
3rd Law Question
Two cars collide head-on. At every moment
during the collision, the magnitude of the force the first car exerts on the second is exactly equal
to the magnitude of the force the second car exerts on the first.
How is this collision an
example of Newton’s 3rd Law of Motion?
a. | Both cars had momentum and inertia before the collision. After the collision, both
cars no longer have inertia or momentum. | b. | After the collision, neither car has any
velocity, so no momentum is present. It would take an unbalanced force to make the cars move from the
location. | c. | Since the collision was equal and opposite, we can say that an equal force was
exerted on both cars. | d. | We do not have enough information to determine
the force of the impact as we do not know the mass or the acceleration of the cars before the
collision. |
|
|
|
6.
|
2nd Law Question
Newton’s 2nd Law of Motion states that
force is equal to mass times acceleration.
If the force acting on the object stays the same
but the mass increases, what is most likely to happen to the acceleration of the object?
a. | Acceleration will stay the same | b. | Acceleration will decrease | c. | Velocity will change
but the speed and direction will remain constant. | d. | Acceleration will
increase |
|
|
|
7.
|
2nd Law Question
The acceleration due to gravity on Earth is
9.8 ,/s2. The force acting on an object on Earth is 16 Newtons.
What is the mass of
this object on Earth?
a. | Mass of the object is 2.6 kilograms | b. | The mass is .6125 kilograms | c. | Mass of the object
is 1.63 kilograms | d. | The object’s mass is 156.8
kilograms |
|
|
|
8.
|
2nd Law Question
A force of 5N is required to increase the
speed of a box from a rate of 1.0 m/s/s to 3.0 m/s/s within five seconds along a level surface.
What change would most likely require additional force to produce the same results?
a. | if friction was increased between the box and the surface it would require less
force. | b. | if the mass of the box was decreased it would require more force. | c. | if friction was
reduced between the box and the surface it would require more force. | d. | if the mass of the
box was increased it would require more force. |
|
|
|
9.
|
2nd Law Question
A small car and big truck are driving down a
two-lane highway on a rainy day. The car is in the left lane, and the truck is in the right lane.
Both vehicles are traveling North at the same speed (70 MPH). Both drivers see a traffic jam up
ahead, and they both slam on theirs brakes with all of their might at the same moment. The car comes
to a halt after traveling 30 feet. The truck, however, does not halt until 120 feet.
Why does
it take the truck longer to come to a complete stop even though both vehicles were moving at the same
speed?
a. | Because vector quantities and scalar quantities are not the same
thing | b. | The mass of the car is much greater than the mass of the truck. | c. | The mass of the
truck is much greater than the mass of the car. | d. | Because both cars were maintaining the same
constant velocity. |
|
.
|
|
|
10.
|
2nd Law Question: Multi-Select
On Earth an astronaut
weighs 980 Newtons (about 220 pounds) and has a mass of 100 kilograms. On the Moon, the same
astronaut weighs 162.2 Newtons (about 37 pounds).
What is the mass of this astronaut on the
Moon, and what is the acceleration acting on the astronaut’s body when she is standing on the
Earth? (select 2 choices)
|