2A1 Chapter 8 Linear Motion

2nd Class Power Engineering

What is the study of the forces acting on objects and their resulting motion?

Mechanics

What is a vector quantity that is the difference in position between two points in space?

Displacement

What is a scalar quantity that is the length of a path that a body travels?

Distance

What is a scalar quantity that describes the distance moved in a given time interval?

Speed

What is a vector quantity that describes the displacement of an object between two points in time?

Velocity

How is average velocity calculated?

Average velocity = Displacement / Time Interval

What is a vector quantity that describes the change of velocity with time?

Acceleration

What are the SI units for acceleration?

Meters per second squared (m/s²)

What is the formula for calculating average acceleration?

Average acceleration is calculated as the change in velocity divided by the time interval.

According to Newton's Second law, what is the relationship between mass, force, and acceleration?

Force is equal to mass multiplied by acceleration (F = ma).

_____ is the force of gravity acting on a mass.

Weight

What is the ability to do work?

Energy

What is the ability to do work due to the motion of a body?

Kinetic energy

Whati s the ability to do work as a result of the position or state of a body?

Potential energy

_____ is produced in a reciprocating engine as a result of pressure acting on a piston that moves linearly in a cylinder.

Indicated power

In kinematics, a _____ is an object whose size can be ignored when deailing with its motion?

Particle

What does it mean for motion to be linear?

Linear motion refers to motion in a straight line, where all quantities are scalar and only one dimension is considered.

What is the relationship between distance and displacement in linear motion?

In linear motion, displacement is usually less than the distance traveled, as displacement measures the straight line between two points.

How is work related to force and distance?

Work is defined as the product of force and the distance moved in the direction of the force.

What is the study of motion of objects without taking into consideration forces that act on the object?

Kinematics

What is the effect of uniform acceleration on velocity?

Uniform acceleration results in a constant change in velocity over time, leading to linear increases or decreases in speed.

_____ is a property of matter that causes resistance to a change in motion.

Inertia

Vector quantities, such as velocity and acceleration, provide both magnitude and _____.

Direction

How do you convert velocity from km/h to m/s?

Multiply by 1000 m/km and divide by 3600 s/h.

What is the formula for Newton's Second Law?

F = ma

What is the weight of a 1 kg mass on Earth's surface?

9.81 N

How is weight calculated using mass?

W = mg, where g = 9.81 m/s²

A body at rest will remain at rest, and a body in motion will remain in motion unless acted upon by an external force is _____.

Newton's First Law

_____ is the product of the mass of a body and its velocity.

Momentum

What is the unit of work?

Joule (J)

How do you calculate the work done against gravity when moving a mass up a ramp?

W = F × vertical distance

What is the formula for calculating acceleration?

a = (v - u) / t

What are the units of kinetic energy?

Joules (J)

How do you convert speed from km/h to m/s?

Multiply by 1000/3600 or divide by 3.6.

What is the formula for potential energy?

E_P = fs, where f is force and s is distance

What is the potential energy of an object at a height?

The potential energy is equal to its mass times the gravitational force times its height (E_P = mgh).

What does the Law of Conservation of Energy state?

Energy cannot be created or destroyed, only transformed from one form to another.

What is the rate at which work is done?

Power

What is the formula for power?

P = w/t, where W is work and t is time

What is the formula for indicated power?

P_i = pALN, where p is mean effective pressure, A is area, L is stroke length, and N is power strokes per second

What is mean effective pressure?

It is the net pressure on the piston, accounting for any opposing back pressure.

What is the relationship between potential energy and kinetic energy during free fall?

As an object falls, potential energy decreases while kinetic energy increases by the same amount.

What is the total power produced by a four-cylinder engine?

The sum of the indicated power produced by each cylinder.

What is the formula for calculating the change in kinetic energy?

The change in kinetic energy can be calculated as ΔE_K = E_K final - E_K initial.

What happens to energy when an object hits the ground?

The kinetic energy is converted into other forms of energy upon impact.