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Physics midterm 2018
Terms in this set (28)
An object can move but not accelerte
It is possible to move for a few minutes, but still end up with zero displacement
The four standard kinematics equations insist that the acceleration is constant during the motion
Which situations have velocities that are negative?
A. Slow down to the left
C. Speed up to the left
F. Travel steadily to the left
The slope of a displacement vs. time plot is the object's
Which of the following best describes an object moving with positive velocity and positive acceleration?
A. The object moves forward and speeds up
Displacement is a vector, but distance is NOT a vector. How are these two concepts different?
Displacement depends only on initial and Final position, not path traveled. Displacement has a direction and can be negative. If motion occurs, distance traveled is always greater than zero
In Physics, the standard unit for an angle is degrees. In fact, my calculator needs to be in degrees mode for this test.
Average velocity is a vector. Time is a scalar. If you compute VavgT, the result is a
In class, we dropped a penny vertically at the same moment we launched another penny horizontally. They hit the ground simultaneously because
A. Vertical motion and horizontal motion are independent
A ball is tossed from the roof of an apartment building. Give two different ways to increase the time of flight of this ball
increase the height of the building
throw the ball upward with a larger speed
The gravitational force between two objects depends on the distance between them
A bathroom scale measures the normal force between the person and the scale, not necessarily the person's weight
For most surfaces, the maximum force of static friction is larger than kinetic frictoin
An object that experiences only one force must accelerate
According to Newton's third law, the total number of forces in the entire universe is an even number
Inertia, the tendency of an object to maintain steady motion, is related to the object's
If an object's mass m moves with constant velocity v, the net force on the object is
A stationary object sitting on a table is in equilibrium directly because
C. its acceleration
Which factor does not directly affect an object moving through a fluid
A. the weight of an object
A mass freely slides down a incline. What forces belong in a force diagram for the descending mass?
friction, gravity, normal force
A book resting on a table experiences a normal fore from the table. In this situation, what is the meaning of the word "normal"?
perpendicular to the surface of the table
A dog pulls on its leash to sniff the grass. According to Newton's 3rd law, what is the reaction force?
The leash pulling back on the dog?
Gravitational potential energy can be negative
Spontaneous radioactive decay (alpha, beta, gamma) makes a nucleus more stable
Two identical cars travel at the same speed on a level road. The first driver applies the brakes gently over a long distance to stop the first car. The second driver presses firmly on the brakes to stop the second car in a short distance. If only the work done by the brakes is considered, which of the following must be true?
C. The same amount of work is done by each car's brakes.
In this unit, the class performed a lab with a cart and a ramp. Student's measured the cart's initial height and distance traveled. What variable did this lab calculate?
The average frictional force that stopped the cart
A bowling ball at the end of a rope siwngs back and forth. Explain why air resistance performs negative work on the ball.
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