lesson #15

Lesson #15
E.Q:How does the concept of work and energy help us to predict the behavior of objects in physical situations?

Multiple Choice

What is the relationship between work and kinetic energy?

• There is no relationship between them

• Work is measured in joules and kinetic energy is measured in newtons

• They are both measured in joules

• They are measured in different units

Multiple Choice

According to the work-energy theorem, what does the net force on an object equal to?

• The force applied to the object

• The change in kinetic energy

• The work done by friction

• The change in potential energy

Multiple Choice

What is the formula for work done by a net force on an object?

• Work = energy * time

• Work = velocity * time

• Work = force * displacement

• Work = mass * acceleration

Multiple Choice

What is the formula for calculating the final speed of an object using kinematics equations?

• V final = V initial * a * t

• V final squared = V initial squared + 2 * a * d

• V final = V initial - a * t

• V final = V initial + a * t

Multiple Choice

What is the formula for calculating the change in kinetic energy of an object?

• Change in kinetic energy = m * v

• Change in kinetic energy = 0.5 * m * v^2

• Change in kinetic energy = m * d

• Change in kinetic energy = f

Multiple Choice

In the given example problem 1, what is the work done by the force when calculated using force times displacement?

• 180 joules

• 1800 joules

• 18000 joules

• 180000 joules

Multiple Choice

What is the work done by a 40N force on a 5kg object when calculated using the change in kinetic energy formula?

• 5120 joules

• 640 joules

• 1280 joules

• 2560 joules

Multiple Choice

Your backpack weighs 20 newtons. You lift it 1.5 meters off the floor.

• 1.5 J

• 20 N

• 30 J

• 50 J

Multiple Choice

Your backpack weighs 20 newtons. You carry it for 100 meters.

• 2000 J

• Zero Joules!

  (Trick question, F and d are not in the same direction)

• 20 J

• 200 J

Open Ended

What is work?

Match

Match the following

• This energy is due to motion or stored up potential energy

• Energy that is transferred by electromagnet rays

• energy from movement of electrons

• energy from the splitting or combination of atoms

• energy from atom and molecular motion

mechanical energy

radiant energy

electrical energy

nuclear energy

thermal energy

• mechanical energy

• radiant energy

• electrical energy

• nuclear energy

• thermal energy

Multiple Choice

Does potential energy apply to moving objects?

• Yes

• No

Multiple Select

Kinetic energy increases with...

• speed

• distance

• mass

• weight

Multiple Choice

What is the kinetic energy of the car if it has a mass of 1,100 kilograms and is
moving at 35 m/s?

• 673,750 J

• 19,250 J

• 1,347,500 J

• Cannot answer

Multiple Choice

A zombie runs by at 12 m/s and has 8200 Joules of kinetic energy. What is the zombie’s mass?

• 56.9 kg

• 683 kg

• 85.4 kg

• 113.88 J

Multiple Choice

If an object is not moving, is work still being done?

• Yes

• No

Multiple Choice

A force can____________.

• make an object move

• make a moving object stop moving

• slow an object down

• all of the above

Multiple Select

True or false: An object resting on the ground can move without force.

• True

• False

Multiple Choice

What type of energy conversion takes place in a toaster?

• Electrical to Chemical

• Electrical to heat

• Chemical to Radiant

• Heat to Chemical

Multiple Choice

What type of energy do we get from the food we eat?

• Light

• Thermal

• Chemical

• Sound

Multiple Choice

What kind of energy is in a rock at the edge of a cliff?

• Potential

• kinetic