Chp. 5 Midterm Review Flashcards
(14 cards)
If you pound a feather with a hammer, which one feels a greater force?
The size of the force is always exactly the same on both of them.
In order to lift a bucket of concrete, you must pull up harder on the bucket than the bucket pulls down on you.
False
A satellite is in orbit around the earth. Which one feels the greater force?
Earth and the satellite feel exactly the same force.
You are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide directly toward the front of the train. From this observation, you can conclude that this train is
Slowing down
While flying horizontally in an airplane, you notice that a string dangling from the overhead luggage compartment hangs at rest at 15° away from the vertical toward the front of the plane. Using this observation, you can conclude that the airplane is
Accelerating backward
A bucket is being lowered by a very light rope with a constant downward velocity. The tension in the rope must be
Equal to the weight of the bucket
An object is moving with constant non-zero velocity. Which of the following statements about it must be true?
The net force on the object is zero
A 20-ton truck collides with a 1500-lb car. Which of the following statements must be true?
During the collision, the force on the truck is equal to the force on the car.
A truck is using a hook to tow a car whose mass is one quarter that of the truck. If the force exerted by the truck on the car is 6000 N, then the force exerted by the car on the truck is
6000 N
An object of mass m rests on a flat table. The earth pulls on this object with a force of magnitude mg. What is the reaction force to this pull?
The object pulling upward on the Earth with force mg.
A person is using a rope to lower a 5.0-N bucket into a well with a constant speed of 2.0 m/s. What is the magnitude of the force exerted by the rope on the bucket?
5.0 N
A person who normally weighs 700 N is riding in a rather swift elevator that is moving at a constant speed of 9.8 m/s. If this person is standing on a bathroom scale inside the elevator,
what would the scale read?
700 N
A 75-N box rests on a perfectly smooth horizontal surface. The minimum force need to start the box moving is
Any horizontal force greater than zero
The acceleration due to gravity is lower on the Moon than on Earth. Which one of the following statements is true about the mass and weight of an astronaut on the Moon’s surface, compared to Earth?
Mass is the same, weight is less
