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WorksheetsEnergy and Forces Final Exam
Total questions: 59
Worksheet time: 2hrs 14mins
Which model is demonstrating what molecules in a solid look like.
If thermal energy is increasing, what is happening to the kinetic energy.
Kinetic energy would be decreasing
Kinetic energy would stay the same
Kinetic energy would be increasing
The following diagram shows water in contact with an ice cube and warmer air.
Which way will energy flow?
From the air to the water
From the water to the air
From the ice cube to the air
From the ice cube to the water
The units for thermal energy are
Degrees Celcius
Degrees Fahrenheit
Kelvin
Joules
(a) is the ability to perform work.
(a) energy is the energy stored in chemical bonds holding the atoms of a compound together.
The unit for work.
Joule
Watt
Amps
Energy
The combined kinetic energy and potential energy of an object.
Potential
Mechanical
Net
Movement
When you drop a basketball it does not bounce back all the way. This is because some of the mechanical energy is lost when it transforms into which of the following ?
Sound
Chemical
Radiant
Hamster
Amy uses 20N of force to push a lawn mower 10 meters. How much work does she do?
20 Joules
200 Joules
2 Joules
no work
You pick up a can of soda off of the countertop. The countertop underneath the can feels colder than the rest of the counter. Which explanation do you think is the best?
The cold has been transferred from the soda to the counter.
There is no heat energy left in the counter beneath the can.
Some heat has been transferred from the counter to the soda.
The heat beneath the can moves away into other parts of the countertop.
Complete this sentence: As water in a freezer turns into ice...
...the water absorbs energy from the air in the freezer.
...the water absorbs the coldness from the air in the freezer.
...the freezer air absorbs heat from the water.
...the water neither absorbs nor releases energy
A 11kg baby crawls across the yard at 2 m/s. What is his kinetic energy?
KE = 11 x 1/2 + 22
KE = 0.5 x 11 x 22
KE = 0.5 x 2 x 112
KE = 1/2 + 0.5 + 112
Kinetic Energy is
The energy of motion
Stored energy
Energy in a magnetic field
Energy stored due to an object's position
Check off all the direct variables you need to find kinetic energy:
Speed
Distance
Time
Mass
A 1 kg bird flies south at 4 m/s. What is its KE?
2 m/s
8 J
2 J
4 J
By which process is thermal energy transferred through a vacuum (space)?
conduction only
convection only
conduction and convection only
radiation only
What is the gravitational potential energy (GPE) of a 1 kilogram book that is 1 meter above the ground?
g = 9.8 m/s2
9.8 Joules
1.0 Joule
0.10 Joule
11.8 m/s2
Identify the type of energy represented by the illustration.
Thermal
Electrical
Elastic
If an object with 40 Joules of potential energy increased its mass 10 times, how much PE would the object have now?
4 J
40 J
400 J
You go to boil a pot of water, (a) kinetic energy is (b) from your hand to the knob which releases the gas and sparks simultaneously. The (c) kinetic energy from the flame is (d) to the pot by (e) .
You are charging your phone:
Order the boxes (left to right) to follow the energy inputs, transfers, transformations and outputs of the system
Electricity is being produced by a wind farm
Electricity added to the grid connects to your home outlet
Electric current passes into your phone battery
Your phone screen lights up displaying the charging indicator
Your phone heats up while charging
On Earth, 1 kg of mass weighs _____. Fg = mg g = 10m/s/s
1 N
5 N
10 N
100 N
Is the force on the soccer ball balanced or unbalanced?
Balanced
Unbalanced
If a object has zero net force are the forces balanced or unbalanced?
Balanced
Unbalanced
A force exerted by a surface perpendicular to the surface.
Normal
Friction
Gravity
Tension
When a bus comes to a stop to avoid hitting a dog, it slows from 8m/s to 0m/s in 1.3 seconds. Which number in this problem is the initial velocity?
8
0
1
1.3
What are the units for acceleration?
m/s
km/hr
m/s2
m
If the two cars have a 0.01 second COLLISION, what will be the net force?
You need both equations:
F=ma and a = t(Vf − Vi)
A car accelerates from rest to 60 m/s in 5 seconds. What is the average acceleration of the car?
12 km/h²
12 m/s²
3.33 m/s²
3.33 km/h²
Two equal forces act in opposite directions on object A. Two unequal forces act in opposite directions on object B. If these are the only forces acting on objects A and B, which of these conclusions is true?
Neither object A nor object B will accelerate.
Both object A and object B will accelerate.
Only object A will accelerate.
Only object B will accelerate.
The diagram shows the forces acting on a running shoe. The shoe is not moving.
The net force is acting to the left.
The net force is moving to the right.
The net force is acting in an upward direction.
The net force is zero, and all the forces are balanced.
The recoil of a firing cannon is an example of Newton’s 3rd Law.
True or False?
True
False
Newton's are the unit used to measure...
energy
force
weight
mass
if one object A exerts a force on a second object B, then B exerts a force on A, and the two forces are equal in magnitude and opposite in direction
true
false
When a heavy football player and a light one run into each other, who exerts more force
The light one
Their force are equal
The heavy one
This equation goes with which law?
Newton's first law of motion
Newton's second law of motion
Newton's third law of motion
Your car has a mass of 2500 kg and a force of 5000 N. How fast will it accelerate?
1 m/s2
2 m/s2
3 m/s2
4 m/s2
Which is an example of the law of inertia?
When you let go of a balloon it flies away.
A soccer ball accelerates faster than a bowling ball when kicked.
Blood rushes from your head to your feet when quickly stopping on an descending elevator.
Which is an example of the law of inertia?
A rocket taking off from Earth
A crash test dummy flies through the windshield in a collision
A small rock skips on a pond faster than a large rock
