Unit 2 Presentation

Fill in your notes as you peruse the presentation.

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This is for a grade.

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​Be sure to take notes!!

Open Ended

Explain why pressing your hand on the surface of your desk does not count as doing work in the scientific sense.

Multiple Choice

Which of the following best describes how the word 'work' is used in science compared to everyday language?

• In science, work means earning money.

• In science, work means exerting a force with muscles.

• In science, work is force applied through a distance.

• In science, work means fixing cars or designing websites.

Fill in the Blank

Fill in the blank: The equation for work is W = ___ × d.

Open Ended

Describe what is meant by 'negative work' and provide an example based on the information given.

Multiple Select

Which of the following are required for work to be done on an object in the scientific sense?

• A force must be applied to the object.

• The object must move in the direction of the force.

• The object must be heavy.

• The force must be applied for a long time.

Multiple Choice

Which of the following is NOT one of the six types of simple machines?

• Lever

• Pulley

• Motor

• Wedge

Open Ended

Identify at least two simple machines that can be found at a playground.

Open Ended

Describe a compound machine that includes at least two simple machines.

Multiple Choice

Which of the following are ways machines can be useful?

• Increase speed

• Change direction of force

• Increase force

• All of the above

Multiple Select

Which of the following are forms of potential energy mentioned in the lesson?

• Elastic potential energy

• Chemical potential energy

• Gravitational potential energy

• Kinetic energy

Fill in the Blank

Energy is the ability to cause ___.

Multiple Choice

Which of the following statements is true about energy based on the lesson content?

• Energy is required for every activity you do.

• Energy can only be found in living things.

• Energy is not involved in the movement of vehicles.

• Energy is always visible to the naked eye.

Open Ended

Describe a real-life situation where you observe energy being used, as shown in Figure 9.

Multiple Choice

Which of the following devices transforms electrical energy into thermal energy?

• Television

• Electric stove

• Radio

• Flashlight

Open Ended

How is thermal energy transferred, and what causes an increase in thermal energy in a substance?

Multiple Choice

The rate of change of position (or distance traveled) with respect to time

• potential energy

• speed

• motion

• kinetic energy

Multiple Choice

A unit of measurement for energy

• kinetic energy

• mass

• joule

• law of conserbation of energy

Multiple Choice

energy of motion

• kinetic energy

• potential energy

• movement

• work

Fill in the Blank

Fill in the blank: The kinetic energy of an object depends on its mass and ___.

Open Ended

Explain how a book can have energy even if it is not moving.

Multiple Select

Which of the following are forms of potential energy?

• Thermal energy

• Kinetic energy

• Elastic potential energy

• Chemical potential energy

Multiple Choice

From the picture, which ball has the least Potential Energy

• A

• B

• C

• D

Multiple Choice

From the picture, which ball has the most Potential Energy?

• a

• b

• c

• d

Fill in the Blank

What is the gravitational potential energy (GPE) of a 5.0kg object located 2.0m above the ground?

Fill in the Blank

A boulder with a mass of 2,500kg rests on a ledge 200m above the ground. What is the boulder's gravitational potential energy (GPE)?

Fill in the Blank

What is the kinetic energy (KE) of a 0.06kg tennis ball traveling at a speed of 150m/s?

Fill in the Blank

A boulder with a mass of 2,500kg rests on a ledge 200m above the ground. What is the boulder's gravitational potential energy (GPE)?

Fill in the Blank

What is the gravitational potential energy (GPE) of a 5.0kg object located 2.0m above the ground?

Fill in the Blank

A student walks to school at a speed of 1.2m/s. If the student's mass is 53kg, what is the student's kinetic energy (KE)?

Fill in the Blank

A 5.6kg bowling ball rolls down the lane at 3.0m/s. What is the bowling ball's kinetic energy (KE)?

Fill in the Blank

A 1600kg car travels at a speed of 12.5m/s. What is its kinetic energy (KE)?

Fill in the Blank

How much gravitational potential energy (GPE) does Mr. Peden have if she climbs a rope 3.5m high? She has a mass of 60kg.

Fill in the Blank

A weightlifter raises a 180kg barbell to a height of 1.95m. How much gravitational potential energy (GPE) does the barbell have?

Fill in the Blank

At a specific point in its swing, a pendulum has 2J of kinetic energy and 1J of potential energy. What is the pendulum's total mechanical energy?

Fill in the Blank

What is the mechanical energy of a 500kg rollercoaster car moving with a speed of 3m/s at the top of a hill that is 30m high? (HINT: calculate GPE & KE)

Multiple Choice

The Law of Conservation of Energy states:

• Energy can created or destroyed but not transformed 
• Energy cannot be created or destroyed, it can only transformed
• Energy can't be created, destroyed or transformed

Multiple Choice

According to the Law of Conservation of energy, the amount of energy before and after a reaction must be the same. Which statement below is true?

• The total amount of energy is conserved
• The total amount of energy is less after a reaction
• The total amount of energy is more after a reaction

Multiple Choice

Which energy transformation below matches?
A book falling?

• chemical to sound and heat
• kinetic to sound and heat
• electrical to sound and heat

Multiple Choice

Which energy transformation below matches?
Water moving over a dam to move a generator?

• kinetic to chemical
• kinetic to electrical
• solar to electrical

Multiple Choice

Which energy transformation below matches?
Green plants?

• chemical to mechanical
• chemical to heat
• solar to chemical

Multiple Choice

Which energy transformation below matches?
Animals eating food?

• electrical to potential
• chemical to kinetic
• potential to chemical

Multiple Choice

Which energy transformation below matches?
Burning coal or carbon-based fuel at a powerplant?

• chemical to heat to electrical
• mechanical to chemical to sound
• electrical to chemical to heat

Multiple Choice

In which case is work being done?

• A

• B

• C

• D

Multiple Choice

ln the Empire State Building Run-Up, competitors race up the 1576 steps (86 flights) of the Empire State Building, climbing a total vertical distance of 320 m. How much work does a m 74 kg racer do?

• 2.321 × 10⁵ Joules

• 2.326 × 10⁵ Joules

• 2.318 × 10⁵ Joules

• 2.317 × 10⁵ Joules

Multiple Choice

This weight lifter raised 105 kg to a height of approximately 2.31 m in 9 seconds. How much power did he developed?

• 264 Watts

• 1029 Watts

• 2,377 Watts

• 4,009 Watts

Multiple Choice

A construction worker uses a pulley and a rope to raise an 85 kg person to a height of 2 m in 6 s. How much did he do?

• 1,670 J

• 833 J

• 278 J

• 417 J

Multiple Choice

Two people are lifting the same weight as shown in the animation. If they both do 10 reps, who will do the most work?

• Bro A

• Bro B

• They both will do the same work

• Can't tell without knowing the weight they are lifting

Multiple Choice

Two people are lifting the same weight as shown in the animation. If they both do 10 reps, who will supply the most power?

• Bro A

• Bro B

• They both will do the same work

• Can't tell without knowing the weight they are lifting