1. If you quadruple the speed of your car, how does its kinetic energy change? a

Question

1. If you quadruple the speed of your car, how does its kinetic energy change?

a. Its kinetic energy becomes 4 times greater.

b. Its kinetic energy becomes 4 times less.

c. Its kinetic energy becomes 2 times greater.
d. Its kinetic energy becomes 16 times greater.
e. Its kinetic energy does not change.

2. Gravitational Potential Energy for a system which includes the Earth and a smaller object depends on.....
Select all that are True.
a. the strength of the Earth's gravity (the size of "g")
b. the height of the object above the Earth
c. the path the object took to get to its height (if it went straight up, vs. side-to-side at an angle, etc.)
d. How fast the object is moving when it is at a certain height
e. the shape of the object
f. the mass of the object

3. Potential Energy.....
Select all that are True.
a. is the property of multiple objects interacting through a force.
b. arises from forces where the work done depends on the path taken.
c. is the property of a single object being acted on by a force.
d. is energy that a system has by virtue of its velocity and acceleration.
e. is energy that a system has by virtue of its position.
f. arises from forces where the work done is independent of the path taken.

Explanation / Answer

here

the initial velocity be v0

final velocity , v = 4 * v0

initial kinetic energy , KE0 = 0.5 * m* v0^2

final kinetic energy , KE = 0.5 * m * v^2 = 0.5 * m * ( 4 * v0)^2

KE = 16 * KE0

d. the kinetic energy becomes 16 times greater

2.

energy = - G * M * m/ r

Gravitational Potential Energy for a system which includes the Earth and a smaller object depends on

b. the height of the object above the Earth
f. the mass of the object

3.

potential energy

e. is energy that a system has by virtue of its position.
f. arises from forces where the work done is independent of the path taken

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