Question

Question 23
Maglev trains are able to levitate based on the physic priciple that opposites attract while like ________________________.

a
repel
b
resist
c
cancel out


Please read: The following questions are review questions from Units 2 and 3. Remember, your tests are cumulative so you will see material from previous units on all tests.

Question 24
Simple machines reduce the amount of work done.

True
False
Question 25
The efficiency of a simple machine is ____________________________________________________________.

a
greater than 100%
b
equal to 100%
c
always less than 100%
d
less than 50%
Question 26
Would a person have more mass on Earth or the Moon?

a
Earth
b
Moon
c
neither, mass doesn't change
d
between Earth and the Moon
Question 27
For an object to be in free fall...

a
it is falling at a constant velocity
b
gravity can be the only force acting on the object
c
the object must be a perfect sphere
d
the object must be on Earth
Question 28
Mass and ___________________ are used to calculate kinetic energy.

a
gravity
b
weight
c
velocity
d
height
Question 29
Potential energy is calculated using mass, gravity, and __________________________ of an object.

a
weight
b
height
c
velocity
d
acceleration

Answer 1

Q23: a (repel)

Q24: False

Q25: c (always less than 100%)

Q26: c (neither, mass doesn't change)

Q27: b (gravity can be the only force acting on the object)

Q28: c (velocity)

Q29: b (height)