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Understanding Physics Trivia Quiz

This subject takes me back to the start of first year in college. It was one of the harder modules I studied but one of my favourites. Let's see if you agree...

A multiple-choice quiz by doublemm. Estimated time: 5 mins.

Author
doublemm

Time
5 mins

Type
Multiple Choice

Quiz #
308,039

Updated
Dec 03 21

# Qns
10

Difficulty
Tough

Avg Score
6 / 10

Plays
2826

Awards
Top 35% Quiz

Last 3 plays: rahonavis (5/10), Guest 31 (8/10), Guest 93 (3/10).

One at a Time - Single Page - Timed Game

Question 1 of 10

1. The "centre of gravity" is the position at which all of an object's weight appears to be acting. If the "centre of gravity" passes through the base of an object, the object is said to have a stable equilibrium. Which of these can be described as having a neutral equilibrium? Hint

A glass of water

A traffic cone

A tennis ball

A rope

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Question 2 of 10

2. What is measured in Nm (Newton metres) and is defined as the force multiplied by the perpendicular distance from a point? Hint

Gravity

Work

A resultant force

A moment

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Question 3 of 10

3. A scalar is defined as something with size ONLY. Which of these is not a scalar? Hint

Time

Mass

Weight

Distance

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Question 4 of 10

4. Equations known as the SUVAT equations can be used to find several values in a uniform linear motion. Each letter, S, U, V, A and T, stands for a particular value. A is the acceleration of the body, but which letter represents displacement? Hint

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Question 5 of 10

5. After jumping out of a plane (which one of my friends recently did), a sky-diver will eventually reach their terminal velocity. Which of these is the most accurate description of terminal velocity? Hint

Uniform acceleration

Constant velocity

Uniform deceleration

Zero velocity

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Question 6 of 10

6. Kinetic energy is defined as half multiplied by mass multiplied by velocity squared. In a closed system the kinetic energy remains constant. In what type of collision does kinetic energy remain constant? Hint

Imperfect

Inelastic

Elastic

Perfect

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Question 7 of 10

7. Newton had three laws of motion. Number two was that force is directly proportional to the rate of change of momentum. Number three stated that every action has an equal and opposite reaction. But what was Newton's first law of motion? Hint

Falling objects on earth will accelerate at 9.82 metres per second per second

All moving objects have kinetic energy

Energy cannot be created or destroyed, but can change its form

A body will have a constant velocity (or will be at rest) unless acted upon by an external force

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Question 8 of 10

8. If the specific heat capacity (c) is the amount of energy needed to increase the temperature of one kilogram of a substance by one Kelvin, what units is c expressed in? Hint

Kilojoules per Kelvin

Joules per kilogram per Kelvin

Joule kilograms per Kelvin

Kilograms per joule per Kelvin

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Question 9 of 10

9. Which law states: The volume of a fixed mass of gas is directly proportional to temperature, provided pressure remains constant? Hint

Murphy's law

Boyle's law

Charles' law

Pressure law

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Question 10 of 10

10. Internal energy of a sample of solid, liquid or gas is the kinetic energy of the molecules plus the potential energy in the intermolecular bonds. Heating the sample causes a higher internal energy. As temperature increases, which of the following does not happen? Hint

Average particle speed increases

Range of particle speeds increases

Maximum particle speed increases

Intermolecular bonds become stronger

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Nov 15 2024 : rahonavis: 5/10
Nov 02 2024 : Guest 31: 8/10
Oct 24 2024 : Guest 93: 3/10

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Quiz Answer Key and Fun Facts

Answer: A tennis ball

An object with neutral equilibrium always has its "centre of gravity" passing through its base.
If an object's "centre of gravity" wasn't to pass through its base it would simply fall over.

2. What is measured in Nm (Newton metres) and is defined as the force multiplied by the perpendicular distance from a point?

Answer: A moment

Moments cause a turning effect (known as a torque) if the object the force is applied to is pivoted and the force is applied at a perpendicular distance from the pivot.

3. A scalar is defined as something with size ONLY. Which of these is not a scalar?

Answer: Weight

Weight is not a scalar but a vector. This is defined as something with size AND direction.
Other vectors include velocity and displacement.

Answer: S

U is the initial velocity.
V is the final velocity.
T is the time taken.

Answer: Constant velocity

The velocity is constant because after the initial acceleration due to gravity, the wind resistance builds up and eventually becomes equal to the force due to gravity. So there is no resultant force and no acceleration (or deceleration).

Answer: Elastic

Likewise, in a closed system momentum (mass multiplied by velocity) is constant.
The conservation of momentum can help to explain why a trolley moves backwards when you jump off of it forwards. The momentum of the trolley will cancel out your own momentum.

Answer: A body will have a constant velocity (or will be at rest) unless acted upon by an external force

Although the other options are true they are not Newton's first law.
This can be displayed using the sky-diver we met earlier. After falling at a constant velocity, when his parachute opens (i.e. the external force) wind resistance increases and the sky-diver will decelerate.

8. If the specific heat capacity (c) is the amount of energy needed to increase the temperature of one kilogram of a substance by one Kelvin, what units is c expressed in?

Answer: Joules per kilogram per Kelvin

Yep, to find the specific heat capacity (c) of a substance we divide the amount of energy by both mass and change in temperature.
The value of c for water is 4200 Joules per kilogram per Kelvin, meaning a whopping 4200 Joules of energy are needed to heat one kilogram of water by just one Kelvin.

9. Which law states: The volume of a fixed mass of gas is directly proportional to temperature, provided pressure remains constant?

Answer: Charles' law

Boyle's law and the pressure law are both very similar to Charles' law.
Boyle's law states the volume of a fixed mass of gas is inversely proportional to the pressure of the gas provided temperature remains constant
The pressure law states the pressure of a fixed mass of gas is directly proportional to temperature, provided volume remains constant.
Murphy's law states if anything can go wrong it will go wrong :P

Answer: Intermolecular bonds become stronger

In fact the opposite happens. Bonds need energy to break and if enough heat is added the intermolecular bonds will weaken and eventually break, causing melting, evaporation or the substance to degrade.

Source: Author doublemm

This quiz was reviewed by FunTrivia editor crisw before going online.
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