WorksheetsApologia Physical Science 8th Grade Module 8
Total questions: 20
Worksheet time: 13mins
Work can be defined as a transfer of what?
mass
energy
force
motion
What is the energy of motion called?
kinetic energy
potential energy
thermal energy
work
What is the energy that is stored due to position or a shape called?
kinetic energy
potential energy
thermal energy
work
Which one of the following is NOT associated with an objects gravitational potential energy?
its mass
its speed
the acceleration due to gravity
its height relative to a reference level
Which of the following increases when an object becomes warmer?
chemical energy
elastic potential energy
nuclear energy
thermal energy
What kind of energy is stored in gasoline?
chemical energy
elastic potential energy
nuclear energy
thermal energy
Which of the following statements is true according to the law of conservation of energy?
Energy cannot be created
Energy cannot be destroyed
Energy can be converted from one form to another
all of the above
In which of the following is no work done?
climbing stairs
lifting a rock
pushing a shopping cart
work is done in all options
In which of the following is a force acting on an object doing no work?
a machine is used to move the object
the force is not in the direction of the objects motion
the force is greater than the force of friction
the object accelerates
What is a unit of work?
joule
newton/meter
watt
all of the above
What is the SI unit of power?
joule
newton
N-m
watt
What does the power of a machine measure?
its rate of doing work
its strength
the force it produces
the work it does
Describe two ways a machine can make work easier for you?
(a)
Knowing the input distance and the output distance of a machine, allows you to calculate which of the following?
work
actual mechanical advantage
efficiency
ideal mechanical advantage
Why is the efficiency of a machine always less than 100%?
a machine cannot have an IMA greater than 1
some work input is lost to friction
the work input is too small
the work output is too great
An ax is an example of what type of simple machine?
inclined plane
screw
wedge
lever
What is the kinetic energy of a 74.0 kg man traveling in a car at a speed of 52.0 m/s?
(a)
A 0.49 kg squirrel jumps from the ground to a tree branch that is 2.1 m high. What is the gravitational potential energy of the squirrel in the tree? Show your work.
(a)
A construction worker uses a cart to move a load of bricks a distance of 10.0 m across a parking lot. He pushes the cart with a constant force of 220 N. What amount of work does he do? If it takes him 1.2 minutes to move the cart, what is his power?
(a)
Use the diagram in Figure 8.33 to answer the following questions.
a. What is the IMA of the ramp?
b. If the ramp shown in figure 8.33 were coated with a smoother surface, how would the AMA of the ramp change?
c. What type of machine is the ramp?
(a)
