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WorksheetsTOPICAL TEST CHAPTER 7: ENERGY AND POWER
Total questions: 35
Worksheet time: 6hrs 50mins
The ability to do work or cause change:
work
energy
momentum
power
Energy in the form of motion.
mechanical energy
potential energy
kinetic energy
momentum
Stored energy in the form of position or condition.
potential energy
kinetic energy
momentum
mechanical energy
What is needed to calculate work?
force
distance
time
mass
A student needs 10 Newtons of force to lift a box to the top of a 2 meter shelf. How much work do they do?
12 J
8 J
20 J
5 J
A soccer player kicks a ball with 20 Newtons of force causing it to travel 100 meters. How much work is done on the ball?
200 J
80 J
5 J
2000 J
A worker climbs a ladder and does 8 J of work on a 2 N object. What is the distance they lift the object?
18 m
4 m
10 m
6 m
Which of these items is not part of the law of conservation of energy?
energy cannot be created
energy cannot be destroyed
energy can be transferred between forms
energy is destroyed by friction
Where is the kinetic energy of pendulum at its highest?
at the top of the swing
at the bottom of the swing
at 1/4 of the swing
at 3/4 of the swing
At which point of this roller coaster is the energy 1/2 kinetic and 1/2 potential?
A
B
C
D
What is needed calculate power?
work
time
mass
distance
Two workers use 100 N of force to move a sofa 2 meters in 2 seconds. How much power is required?
100 watts
400 watts
104 watts
50 watts
what is defined as the product of the magnitudes of displacement and the
component of the force parallel to the displacement ?
work
energy
momentum
power
When an object is carried at a constant
velocity by a force,
no work is done on the
object.
the work done is maximum on the
object.
the work is done minimum on the
object.
the work done is 100 % on the
object.
The SI Unit for Energy is
Joule
Newton
Calorie
Watt
Bob (80 kg) uses 180 N of force to get him up the slope. The vertical distance is 2 m and the diagonal is 10 m. Calculate the work he does.
1600 J
160 J
3600 J
1800 J
An 80 N rope tension force is used to slowly pull a wagon 50 m up a hill. Calculate the work done by the rope if it pulls parallel to the hill
-4000 J
4000 J
Energy Efficiency is calculated by useful energy (Energy Out) divided by energy consumed (Energy In) , expressed as a percentage
False
True
What percent energy is wasted by a machine if the energy input is 262 J and the energy output is 131 J?
5%
50%
100 J
What is the work output of a machine that has a work input of 2,800 Joules and an efficiency of 90%?
25200 J
2520 J
0.0082J
A weight-lifter raises a 2000N weight through a vertical height of 2.0m in 0.80s. What useful power does he develop in doing this?
800 W
700W
4000W
5000W
Kinetic energy is associated with ---.
speed
position
direction
temperature
