WorksheetsUnit II: Energy Study Guide
Total questions: 40
Worksheet time: 3hrs 20mins
If you go twice as fast, your kinetic energy becomes:
2 times smaller
4 times smaller
2 times bigger
4 times bigger
what is a requirement of doing work?
Speed
Energy
Mass
Weight
Energy can be thought of as stored
force
mass
weight
work
Potential energy is energy due to the:
motion of an object
height of an object
temperature of an object
speed of an object
Which of the following is a form of radiant energy?
Light
Gasoline
Sound
Batteries
What happens to the kinetic energy of a moving car if you double the mass of the car?
It increases by 4 times
It increases by 2 times
It decreases by 4 times.
It decreases by 2 times.
A 1500 kg car accelerates along a flat track to a speed of 20 m/s. How much does its gravitational potential energy increase over the length of the track?
0 J
75 J
30,000 J
300,000 J
What is the kinetic energy of a go-cart with a mass of 150 kg and a speed of 20. m/s?
1500 J
3000 J
30000 J
60000 J
A 0.6 kg basketball balances on the rim of a basketball hoop that is 3 meters high. What is the basketball's potential energy?
1.8 J
5 J
9 J
18 J
Kevin jumps straight up in the air to a height of 1 meter. At the top of his jump, he has potential energy of 1,000 J. What is Kevin's weight?
200 N
1000 N
2000 N
4000 N
As a car is slowed, most of its kinetic energy is converted by the brakes to:
potential energy
electrical energy
thermal energy
chemical energy
What happens to the energy stored in oil when you use it to heat your house?
It is used up.
It is destroyed.
It is converted to heat energy.
It stays exactly the same.
A bowler lifts her bowling ball a distance of 0.5 m using 35 joules of energy. What is the mass of her bowling ball?
3 kg
7 kg
17.5 kg
35 kg
When gasoline is used as fuel in an automobile engine several energy transformations take place. Which of the following statements does NOT agree with the law of conservation of energy?
When gasoline is burned, its energy is destroyed.
The energy from the gasoline decreases, the energy increases in another form.
As the energy in the form of gasoline decreases, the energy increases in another form
Once the energy in the gasoline is released, it can never be destroyed.
While sitting next to a campfire, Kenai noticed several different forms of energy being transformed from the potential energy of the wood. Which form of energy would she NOT see in the campfire?
Heat
Nuclear
Light
Sound
The equation used to calculate work when force is applied to move an object some distnace is:
work=force + distance
work=force/distance
work=distance/force
work=(force)(distance)
Which of the following use the same units of measurement?
Power and work
force and work
energy and work
power and energy
What is the most work that can be done with 100 joules of energy?
10 J
100 J
1000 J
10000 J
A 60 N block at rest at the bottom of a frictionless incline plane is pushed up the incline. The amount of work done against gravity is _____ joules.
0
20
60
180
A 2.2 kg crate is pulled by a 30 N force over a distance of 5 meters. How many joules of work are done by pulling the crate?
11 J
66 J
150 J
330 J
Jake, who weighs 680 N, climbs a 6 meter ladder in 8 seconds. What was Jake's power?
510 w
4080 w
5440 w
32640 w
The efficiency of a machine is usually expressed in:
joules
watts
newton-meters
percent
Which of the following improves the efficiency of a machine?
Reducing friction
Adding more energy
Running it faster
Increasing friction
An electric food processor uses 250 joules of electrical energy every second. Due to friction and other causes, the energy available to spin the blades to cut food is reduced to 200 joules per second. The efficiency of the food processor is:
25%
50%
80%
125%
The efficiency of a modern bicycle is 95%. If you exert 200 joules in pedaling a bicycle on level ground, what is the work output?
95 J
105 J
190 J
295 J
An electrical water heater raises the temperature of water by adding 8,000 joules of energy to the water in 40 seconds. What is the minimum power required by the water heater?
0.005 J
200 J
3,200 J
320,000 J
The work output is 500 joules for a machine that is 25% efficient. the work output is _____ joules.
125
1,000
2,000
12,500
If a machine's maximum power rating is 2,000 watts, what is the fastest time for it to do1,000 joules of work?
0.5 s
2 s
1,000 s
2,000,000 s
A gallon of gasoline contains chemical energy. If you pour a gallon of gasoline into your car, you could drive for about 20 miles on the highway (about 20 minutes). You could choose instead to run a lawn mower for an hour with one gallon of gasoline. If the gasoline were to come in contact with a fire, the entire gallon would burn in less than a minute. Which reaction has the most power?
Burning the gasoline in the car
Burning the gasoline in a fire
Burning the gasoline in the lawn mower
They are equal because the gasoline has the same chemical potential energy in each case.
A system of pulleys is used to lift an elevator carrying a 3300 N load. Assuming the pulley system is nearly friction-free, approximately how far would 10,000 joules of energy lift the elevator?
0.3 meters
3 meters
30 meters
300 meters
A simple machine can multiply:
forces only
energy only
forces and energy
forces and speed
A lever rotates around a fixed point called a:
ball bearing
gear
pulley
fulcrum
The simple machine that operates as a ramp that curves around a shaft is a:
rope and pulley system
screw
lever
gear
In the picture of the crowbar, which letter shows the fulcrum?
A
B
C
None of the Above
Gears may be combined in a system to:
transfer motion.
change rotating speeds.
multiply forces.
All of the above
Which of the following rope and pulley systems has the largest mechanical advantage?
System A has the largest
System B has the largest
System C has the largest
All three systems have the same.
Which simple machines are represented in the diagram? (Choose all that apply)
lever
ramp
wheel and axle
rope and pulley
Making a ramp steeper:
increases its mechanical advantage.
decreases its mechanical advantage
increases its efficiency
decreases its efficiency
In the human body, what does the elbow joint act as?
Fulcrum
Gear
Ramp
Screw
When you stand on your toes, what does your foot act as?
Gear
Lever
Screw
Ramp
