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level: Level 1 of Chapter 3 Dynamics : explaining motion

Questions and Answers List

level questions: Level 1 of Chapter 3 Dynamics : explaining motion

QuestionAnswer
One of the characteristics that make up a 'Newton's third law pair is forces of the same type. Give 5 examples of this?1. Gravitational forces 2. Electrical forces 3. Contact forces 4. Tension forces 5. Magnetic forces
One of the characteristics that make up a 'Newton's third law pair is forces of the same type. Give 5 examples of this?1. Gravitational forces 2. Electrical forces 3. Contact forces 4. Tension forces 5. Magnetic forces
What is the formula for resultant force and how is it written in symbols?mass x acceleration F = ma
What is the symbol and unit for resultant forceSymbol = F Unit = N (newtons )
What is the symbol and unit for massSymbol = m Unit = kg (kilograms)
What is the symbol and unit for accelerationSymbol = a Unit = m s^-2 (meters per second squared)
What is Newton's second law of motion?For a body of constant mass, its acceleration is directly proportional to the resultant force applied to it
The equation a = F / m relates acceleration, resultant force and mass. What does it show in particular?It shows that the bigger the force, the greater the acceleration it produces
What is inertia?the mass of an object is a measure of its inertia, or its ability to resist any change in its motion Greater the mass, smaller the acceleration that results
Define the centre of gravity of an objectCentre of gravity of an object is defined as the point where its entire weight appears to act.
What effect does the smaller mass of the moon compared to Earth have on its gravity?It has weaker gravity
What is the acceleration of freefall on the Moon?gMoon = 1.6 m s^-2
What is the symbol, unit and base unit of massSymbol = m Unit = kg In terms of base units = kg
What is the symbol, unit and base unit of weight?Symbol = mg Unit = N In terms of base units = kg m s^-2
In the 17th century Galileo came to 2 conclusions about the natural motion of objects, what are they1. An object at rest will stay at rest, unless a force causes it to start moving 2. A moving object will continue to move at a steady speed in a straight line, unless a force acts on it.
What is uniform motion?Natural state of motion of an object
What is Newton's first law of motion?If no resultant force acts on an object it will not accelerate. The object will either remain stationary or it will continue to travel at a constant velocity.
What is known as terminal velocity? And what is it approximately ?Maximum velocity 120 miles per hour (about m s^-1)
Air resistance is just one example of (?) that objects experience when they move through a fluid, a liquid or a gasresistive force
What is contact forces?When two objects touch each other, they exert a force on the other
What is Newton's third law of motionWhen 2 objects interact, each exert a force on the other, forces are equal and opposite to each other
What are the 4 characteristics that 2 forces have that make up Newton's third law pair1. Act on different objects 2. Equal in magnitude 3. Opposite in direction 4. Forces of the same type
One of the characteristics that make up a 'Newton's third law pair is forces of the same type. Give 5 examples of this?1. Gravitational forces 2. Electrical forces 3. Contact forces 4. Tension forces 5. Magnetic forces
What is the base unit and the symbol for length?Symbol = x,l,s and so on Base unit = m (meter)
What is the base unit and symbol for mass?Base unit = kg (kilograms) Symbol = m
What is the base unit and symbol for timeBase unit = s (second) Symbol = t
What is the base unit and symbol for electric current?Base unit = A (Ampere) Symbol = I
What is the base unit and symbol for thermodynamic temperature?Base unit = K (kelvin) Symbol = T
What is the base unit and symbol for amount of substance?Base unit = mol (mole) Symbol = n
What is the equation we use to define Newton?F = ma
When each term in an equation has the same base units the equation is said to be?homogeneous
Does the prefix come before or after the unitbefore
What is the symbol and the multiple for the prefix kilo?Multiple = 10^3 Symbol = k
What is the symbol and the multiple for the prefix mega?Symbol = M Multiple = 10^6
What is the symbol and the multiple for the prefix giga?Symbol = G Multiple = 10^9
What is the symbol and the multiple for the prefix tera ?Symbol = T Multiple = 10^12
What is the symbol and the multiple for the prefix deci ?Symbol = d multiple = 10^-1
What is the symbol and multiple for the prefix centi?Symbol = c Multiple = 10^-2
What is the symbol and multiple for the prefix milli?Symbol = m Multiple = 10^-3
What is the symbol and multiple for the prefix micro?Symbol = µ Multiple = 10^-6
What is the symbol and multiple for the prefix nano?Symbol = n Multiple = 10^-9
What is the symbol and multiple for the prefix pico?Symbol = p Multiple =10^-12