Physics Chapter: Mass and Weight Concepts

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What unit is mass measured in?

Newtons
Ounces
Pounds
Kilograms (correct)

Which statement accurately describes weight?

It is the pull of the Earth on an object. (correct)
It is a measure of the amount of matter in an object.
It is measured in kilograms.
It remains constant in all locations.

How does weight change when an object is moved to deep space?

It remains the same.
It increases significantly.
It becomes zero. (correct)
It doubles.

What is a key characteristic that differentiates mass from weight?

Mass is a scalar quantity. (B) Signup and view all the answers

Why is everyday language often misleading when discussing mass and weight?

It refers to mass as weight in common usage. (C) Signup and view all the answers

What is the weight of a mass of 5 kg on Earth?

50 N (D) Signup and view all the answers

Why does weight differ from mass?

Weight is influenced by gravitational field strength. (D) Signup and view all the answers

What is the gravitational field strength on Mars?

3.7 N/kg (A) Signup and view all the answers

How does gravitational field strength affect weight at the poles compared to the equator?

Weight is greater at the poles than at the equator. (D) Signup and view all the answers

What would be the gravitational field strength in space?

0 N/kg (B) Signup and view all the answers

What is the effect of a force on a stationary object?

It can cause the object to move. (B) Signup and view all the answers

Which statement about force is true?

Force can change the shape or size of an object. (A) Signup and view all the answers

What unit is used to measure force?

Newton (N) (B) Signup and view all the answers

What causes the weight of an object on Earth's surface?

The gravitational force acting on it. (B) Signup and view all the answers

If an object's mass is 1 kg, what is its approximate weight on Earth?

9.81 N (A), 10 N (D) Signup and view all the answers

What is the primary effect of air resistance on moving objects?

It increases with the object's speed. (D) Signup and view all the answers

Why are trains and cars designed with specific shapes?

To minimize air resistance. (B) Signup and view all the answers

What term describes the upward force acting on objects submerged in a liquid?

Up thrust (C) Signup and view all the answers

What happens when a heavy object is lifted underwater compared to being lifted in air?

It feels lighter underwater. (A) Signup and view all the answers

What direction does air resistance act in relation to motion?

In the opposite direction of motion. (B) Signup and view all the answers

What is the primary effect of weight on an object?

It pulls the object downwards. (B) Signup and view all the answers

How does friction affect movement between two touching objects?

Friction opposes the direction of movement. (C) Signup and view all the answers

What best describes a reaction force?

A force that acts in the opposite direction to an action force. (D) Signup and view all the answers

Which statement is true regarding Newton's Third Law of Motion?

For every action, there is an equal and opposite reaction. (C) Signup and view all the answers

What happens to friction when someone tries to stop on a wet surface?

Friction is present but reduced. (B) Signup and view all the answers

Which method can be used to reduce friction between two surfaces?

Applying oil or grease between the surfaces. (A) Signup and view all the answers

What happens without a reaction force?

Objects would move indefinitely. (C) Signup and view all the answers

What is one example of a method that uses separation to reduce friction?

Mounting surfaces with ball bearings. (A) Signup and view all the answers

In the example of firing a gun, what is the action force?

The gun pushing the bullet out. (B) Signup and view all the answers

Which of the following correctly illustrates Newton's Third Law?

A swimmer pushing water backwards to move forward. (A) Signup and view all the answers

What does Newton's 1st law state about an object in motion when no external forces are acting on it?

It will keep moving at a steady speed in a straight line. (C) Signup and view all the answers

According to the law of action and reaction, what happens when one object exerts a force on another?

Both objects exert forces of equal magnitude in opposite directions. (D) Signup and view all the answers

What is the reason that unpowered vehicles come to rest on Earth?

They encounter friction which opposes motion. (C) Signup and view all the answers

What is meant by the expression $F = -F$ in the context of forces?

Every action force has a corresponding reaction force that is equal in magnitude and opposite in direction. (C) Signup and view all the answers

What will happen to a moving object in the absence of any friction or external forces?

It will continue moving indefinitely at a constant speed in a straight line. (A) Signup and view all the answers

What happens when an unbalanced force acts on an object?

It experiences acceleration or deceleration. (D) Signup and view all the answers

How do scalars differ from vectors?

Vectors have both magnitude and direction, whereas scalars have only magnitude. (A) Signup and view all the answers

What is the result of adding two vectors that point in opposite directions?

The resultant vector's magnitude is the difference between the two. (C) Signup and view all the answers

When 10 seconds is added to 20 seconds, what is the result?

30 seconds. (B) Signup and view all the answers

Which of the following is a scalar quantity?

Mass. (C) Signup and view all the answers

What does the upthrust force acting on an object in water depend on?

The weight of water displaced by the object (D) Signup and view all the answers

Which force acts in the opposite direction to the weight of an object submerged in water?

Upthrust (B) Signup and view all the answers

What is the role of air resistance on an object submerged in water?

It opposes the motion of the object (A) Signup and view all the answers

Which forces contribute to the stability of an object submerged in a fluid?

Upthrust and reaction force (A) Signup and view all the answers

What defines the drag or friction force acting on an object moving through a fluid?

It increases with the speed of the object (C) Signup and view all the answers

What does Newton's first law of motion primarily describe?

The tendency of an object to resist changes in its state of motion (C) Signup and view all the answers

In the scenario of a car hitting a wall, what primarily causes the driver to continue moving forward?

Inertia (B) Signup and view all the answers

What condition is necessary for an object to be considered in equilibrium?

Having all forces equal in magnitude and opposite in direction (A) Signup and view all the answers

Which of the following best illustrates the concept of inertia?

A passenger leaning forward in a car that comes to a sudden stop (C) Signup and view all the answers

When a book is resting on a table, what forces are in equilibrium?

The force of the book pushing down and the support force from the table pushing up (D) Signup and view all the answers

What is a force?

A push or pull on an object, caused by interaction with another object.

What does a force do?

It can make stationary objects move or change how fast or where moving objects go. It can also change an object's shape or size.