A force acts on an object. Which option describes an action that could prevent the object from moving?
a force applied in the opposite direction with the same magnitude at the same time
The same net force is applied to two bodies. The first body acquires half of the acceleration of the second body. What is the relationship between the masses of the bodies?
The mass of the first body is double the mass of the second body.
A box is against a wall. A person pushes on the box, but the box does not move. Is this situation an example of a force?
Yes, this is an example of a force because a force is a push or pull.
A spring scale shows a net force of 0.8 N acting on a 1.5-kg mass. What happens to the acceleration of the object if the net force is decreased to 0.2 N?
The acceleration decreases to a quarter of its original value, or about 0.13 m/s2.
Two postal delivery workers have different routes. They both travel from the post office, to neighborhoods to deliver mail, and then back to the post office. Which statement must be true about the two postal delivery workers?
They each have a displacement of 0 miles.
On a position vs. time graph, which feature would represent motion in the negative direction over time?
a downward-sloping line segment
Which statement correctly classifies distance and displacement?
Distance is a scalar quantity, and displacement is a vector quantity.
Which statement fairly compares the 2nd segment and the 3rd segment?
These represent different periods of time, and the force during segment 2 is different than the force during segment 3.
In which situation would the momentum of a moving object increase?
A force acting in the direction opposite the object’s motion is removed from the object.
Use the graph showing the motion of a person over time to answer the question. Which statement correctly compares his motion during the first 10 minutes to his motion during the last 10 minutes?
He is going faster and in a different direction during the first 10 minutes than in the last 10 minutes.
The same type of engine is placed in two different airplanes. The first airplane is twice as heavy as the second airplane. Which statement is correct about the mass of the airplane and its acceleration, assuming a constant net force?
Decreasing the mass of the airplane will result in the airplane accelerating more.
Which statement about reversible reactions is correct?
They can occur in either direction.
A helicopter is accelerating up into the air while it is also accelerating due north. Which statement about the forces acting on the helicopter is true?
The drag on the helicopter is directed downward and to the south.
Which quantity or quantities is/are increasing for the object represented by Line B?
velocity and position
Two galaxies on opposite ends of the universe are moving away from the Earth. Each has a velocity of 200,000 km/s relative to the Earth. How fast would an observer in one of those galaxies see the other galaxy moving away?
between 200,000 and 300,000 km/s
The harder a gas pedal in a car is pressed, the faster the car’s velocity increases. Which phrase best describes the relationship between how hard the gas pedal is pressed and the acceleration of the car?
There is both a positive correlation and causation.
Use the equation to answer the question. (v = v0 + at) A car company advertises that a certain model of car can go from 0 to 100 km/h in 4 seconds. What is the car’s acceleration?
25 km/hr/s
There answers for the whole test. Your frickin welcome.