Unit Review

Question 1 of 20

What form(s) of energy does an internal combustion engine use to do work?

A. Heat energy

B. Mechanical energy

C. Chemical energy

D. All of the above

Question 2 of 20

When a piston compresses molecules of fuel and air inside a cylinder, the molecules ____.

A. Slow down

B. Lose heat

C. Speed up

D. Ionize

Question 3 of 20

In a reciprocating engine, the back-and-forth motion of the pistons is transformed into ___.

A. Electrical energy

B. Rotary motion of the crankshaft

C. Potential energy

D. Rotary motion of the cylinder

Question 4 of 20

Gases in the cylinders of an automobile expand upon intake and then are compressed in hundredths of a second.

A. The gases gain energy and become warmer during compression.

B. The gases lose energy and become cooler during expansion.

C. This reversible thermodynamic process is called "adiabatic."

D. All of the above are correct

Question 5 of 20

An engine converts __________.

A. Mechanical energy into torque

B. Fuel into mass

C. Heat into motion

D. All of the above

Question 6 of 20

If the card in this picture is hit with enough force, the penny will land in the glass. This is due to ____.

A. The inertia of the penny

B. The lack of inertia of the card

C. The balance of all external forces

D. None of the above

Question 7 of 20

A car with a turbocharged engine accelerates faster from 0-60 mph than a regular car of the same mass, because ___________.

A. Following Newton's First Law of Motion, an unbalanced force is acting on both cars and causing them to accelerate.

B. Following Newton's Second Law of Motion, the turbocharged engine is producing more force, causing the turbocharged car to accelerate faster.

C. Following Newton's Third Law of Motion, as the cars accelerate, the road is exerting more force on the tires of the turbocharged car than on the tires of the regular car.

D. All of the above are correct.

Question 8 of 20

Adding rocks to the toy car at rest on the ramp would increase the car's mass and ___.

A. Reduce its velocity

B. Increase its velocity

C. Increase its inertia

D. Decrease its acceleration as it rolled down the ramp.

Question 9 of 20

What is the relationship between acceleration and mass, assuming a constant amount of force?

A. Acceleration is inversely proportional to the mass of an object.

B. Acceleration is directly proportional to the mass of an object.

C. No relationship exists between acceleration and mass.

D. Acceleration and mass are equal to each other.

Question 10 of 20

What is the difference between velocity and acceleration?

A. Velocity is the speed of an object; acceleration is the rate at which momentum changes.

B. Velocity is the speed of an object; acceleration is the distance an object travels divided by the time it takes to travel that distance.

C. Velocity is the speed of an object; acceleration is the rate at which velocity changes.

D. Velocity is the rate at which acceleration changes; acceleration is the speed of an object.

Question 11 of 20

Newton's First Law of Motion is known as _____________________.

A. The law of friction

B. The law of inertia

C. The law of unbalanced forces

D. The law of velocity

Question 12 of 20

With both cars traveling at maximum speed, how long will it take car A to catch car B?

A. 100 seconds

B. 1,600 seconds

C. 0.01 seconds

D. 1 hour

Question 13 of 20

A car traveling at 10 m/sec accelerates at the rate of 1.5 m/sec² for an interval of 10.0 sec. What is its velocity at the end of this acceleration?

A. 25 m/sec

B. 115 m/sec

C. 16.66 m/sec²

D. 150 m/sec²

Question 14 of 20

A car accelerates at an average rate of 2.5 m/sec². At this rate, how long will it take the car to accelerate from 0 m/sec to 55 m/sec?

A. 137.5 sec

B. 0.045 sec

C. 44 sec

D. 22 sec

Question 15 of 20

Two cars travel at the same speed. One travels for 15 minutes and goes 50 kilometers, and the other travels for 35 minutes. How far does the second car travel?

A. 93.45 km

B. 116.66 km

C. 142.86 km

D. 1,750 km

Question 16 of 20

In this graph, the object at point C ___________________.

A. Has positive acceleration

B. Has zero acceleration

C. Has negative acceleration

D. Is moving at a constant speed

Question 17 of 20

Newton's Second Law of Motion ___.

A. Explains the relationship between force, mass and acceleration

B. Is known as the law of inertia

C. Is known as the law of unopposed forces

D. Explains equal and opposite reactions

Question 18 of 20

Which of Newton's Laws of Motion explains why your car moves forward instead of the road moving backward when you step on the accelerator?

A. Newton's First Law of Motion

B. Newton's Second Law of Motion

C. Newton's Third Law of Motion

D. Newton's Fourth Law of Motion

Question 19 of 20

A toy car rolls down a ramp due solely to the pull of gravity. Not counting air resistance, what prevents the car from accelerating down the ramp at the rate of 9.8 m/sec²?

A. The upward force exerted by the ramp on the car.

B. The upward force exerted by the car on the ramp.

C. The upward force of inertia.

D. None of the above; the car will accelerate down the ramp at 9.8 m/sec².

Question 20 of 20

Why might a fuel other than gasoline burn less efficiently in an engine designed to run on gasoline?

A. A fuel with a higher octane rating than gasoline will burn less efficiently in an engine designed to use gasoline.

B. A fuel with a lower octane rating than gasoline will burn less efficiently in an engine designed to use gasoline.

C. All fuels other than gasoline have lower octane ratings and burn less efficiently.

D. Other fuels cannot be burned in an engine designed to use gasoline.