PHYS 1114 Chapter 6 Misconceptual
Questions
You push very hard on a heavy desk, trying to move it. You do work on the desk... -
Right Ansa -only if it starts moving
A satellite in circular orbit around the Earth moves at constant speed. This orbit is
maintained by the force of gravity between the Earth and the satellite, yet no work is
done on the satellite. How is this possible? - Right Ansa -No work is done if the direction
of motion is perpendicular to the force.
When the speed of your car is doubled, by what factor does its kinetic energy increase?
- Right Ansa -4
A traveling car at velocity v can stop in a minimum distance d. What would be the car's
minimum stopping distance if it were traveling at a velocity of 2v? - Right Ansa -4d
A bowling ball is dropped from a height h onto the center of a trampoline, which
launches the ball back up into the air. How high will the ball rise? - Right Ansa -No more
than h - probably a little less.
A ball is thrown straight up. At what point does the ball have the most energy? Ignore air
resistance. - Right Ansa -Everywhere. The energy of the ball is the same at all of these
points.
A car accelerates from rest to 30 km/h. Later, on a highway it accelerates from 30 km/h
to 60 km/h. Which takes more energy: going from 0 to 30 or from 30 to 60? - Right Ansa
-30 to 60
Engines, including car engines, are rated in horsepower. What is horsepower? - Right
Ansa -The rate at which the engine can do work?
Questions
You push very hard on a heavy desk, trying to move it. You do work on the desk... -
Right Ansa -only if it starts moving
A satellite in circular orbit around the Earth moves at constant speed. This orbit is
maintained by the force of gravity between the Earth and the satellite, yet no work is
done on the satellite. How is this possible? - Right Ansa -No work is done if the direction
of motion is perpendicular to the force.
When the speed of your car is doubled, by what factor does its kinetic energy increase?
- Right Ansa -4
A traveling car at velocity v can stop in a minimum distance d. What would be the car's
minimum stopping distance if it were traveling at a velocity of 2v? - Right Ansa -4d
A bowling ball is dropped from a height h onto the center of a trampoline, which
launches the ball back up into the air. How high will the ball rise? - Right Ansa -No more
than h - probably a little less.
A ball is thrown straight up. At what point does the ball have the most energy? Ignore air
resistance. - Right Ansa -Everywhere. The energy of the ball is the same at all of these
points.
A car accelerates from rest to 30 km/h. Later, on a highway it accelerates from 30 km/h
to 60 km/h. Which takes more energy: going from 0 to 30 or from 30 to 60? - Right Ansa
-30 to 60
Engines, including car engines, are rated in horsepower. What is horsepower? - Right
Ansa -The rate at which the engine can do work?
