Physics Unit Conversions and Motion

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Questions and Answers

If two vectors, each with the same magnitude but opposite directions, are added together, what is the result?

Lesser magnitude

Greater magnitude

Double the magnitude

Zero magnitude (correct)

Which of the following measures has the greatest value?

10 kg (correct)

1 000 cg

1 000 g

0.01 mg

Identify the following quantities as scalar or vector: the mass of an object, the number of leaves on a tree, and wind velocity.

Scalar, scalar, vector (correct)

Vector, scalar, vector

Vector, scalar, scalar

Scalar, vector, vector

Which of the following situations is impossible?

An object has constant non-zero velocity and changing acceleration. Signup and view all the answers

When the distance covered by an object is directly proportional to time, what does this indicate?

Constant speed Signup and view all the answers

Which statement is true regarding the addition of vectors A and B to form vector C?

The relationship can be expressed as |A - B| = |C| if A and B are in opposite directions. Signup and view all the answers

If a body is in a state of equilibrium, which of the following conditions must be true?

The sum of all forces acting on the body is zero. Signup and view all the answers

Which of the following is true about speed and acceleration?

Acceleration can occur without a change in speed. Signup and view all the answers

Which statement regarding vectors A and B is true when they are added to form vector C?

A and B must be displacements Signup and view all the answers

Is it possible for an object to achieve equilibrium with only one force acting on it?

No, it requires at least two forces for it to be balanced Signup and view all the answers

Which method should NOT be used for finding the resultant vector graphically?

Use a compass for direction Signup and view all the answers

What happens to a horizontally launched projectile when gravity is removed?

It will keep moving horizontally Signup and view all the answers

In which instance will an object's velocity be equivalent to its speed?

The object is traveling straight without changing direction Signup and view all the answers

Which condition is required for an object to be in static equilibrium?

The sum of forces must equal zero and the sum of moments must equal zero Signup and view all the answers

Which of the following best describes vector addition?

The resultant vector depends on both the magnitude and direction of the individual vectors Signup and view all the answers

What is the consequence of two equal forces acting in opposite directions on an object?

The object remains at rest or in constant motion Signup and view all the answers

If Earth's mass were halved, how would your weight change?

It will be halved. Signup and view all the answers

What force is counteracting the gravitational force of a pen resting on a desk, pulling it downward with a force of 15 N?

The table exerts an upward normal force, with equal magnitude and opposite direction. Signup and view all the answers

What phenomenon causes a ball to move in a straight line after its string is broken while being whirled?

Inertia Signup and view all the answers

Which set of data indicates a systematic error when the true value is 5 g?

2 g, 2 g, 2 g, 2 g, 2 g Signup and view all the answers

What is a correct representation of scientific notation for the value 720,000?

7.2 x 10^5 Signup and view all the answers

Which object would experience a net force of zero when subjected to forces acting on it?

A ball resting on a table Signup and view all the answers

What is the primary distinction between speed and acceleration?

Speed measures how fast an object moves, while acceleration measures the rate of change of that speed. Signup and view all the answers

Which graphical representation effectively displays vector addition?

A scale drawing where arrows represent vectors Signup and view all the answers

Study Notes

Unit Conversions

Comparing various unit conversions, 10 kg has the greatest value

Scalars and Vectors

Mass, number of leaves on a tree are scalars
Wind velocity is vector

Vector Addition and Subtraction

Adding two vectors of equal magnitude but opposite directions results in a zero magnitude

Motion and Acceleration

An object can have constant non-zero acceleration even with changing velocity
An object can have constant non-zero velocity with changing acceleration
An object cannot have constant velocity with changing acceleration

Constant Velocity

Distance covered directly proportional to time

Vector Sum

If A+B = C then A and B must point in the same direction
A, B and C must be displacements

Equilibrium

A single force cannot achieve equilibrium

Resultant Vectors

Finding the resultant vectors graphically involves the use of ruler, protractor, head to tail method and scale.

Projectile motion

Without gravity, a projectile launched horizontally will keep moving horizontally.

Velocity and Speed

Velocity and speed are equal along a straight line

Gravity and Weight

Weight on Earth depends on mass, if mass is split in half, weight is halved

Normal Force

A pen on a desk is prevented from falling by the desk's upward normal force, which has equal magnitude and opposite direction to the gravitational force acting on it.

Inertia

A ball whirled on a string, when string breaks will move in straight line due to Inertia.

Systematic Error

Data set with true/theoretical value of 5g shows systematic error if all values are consistently higher or lower than the true value.

Scientific Notation

Correct scientific notation: 7.2x10⁵.
100x10⁶, 12.5x10⁵, 0.5x10^-2 are incorrect expansions.

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Description

This quiz covers essential concepts in physics such as unit conversions, scalars vs. vectors, and the principles of motion and acceleration. Test your understanding of vector addition, equilibrium, and projectile motion through a series of questions. Perfect for reinforcing physical science knowledge.