Energy
What is the unit of energy?
Joules
How many laws of motion did Newton create?
3 laws of motion
How many cm are there in 1 m?
100 cm = 1 m
The S.I unit for mass is
..the kilogram
What is the unit of force?
The Newton
Define energy
Energy is the ability of a body to do work
Newton's first law is based on this property?
Hint : "laziness of a body"
What is inertia
If the prefix c represents centi. What does the prefix "M" (big M )
M represents Mega = 1 Million
Give 2 examples of basic units and their units
Mass = kilograms
Luminous intensity = candela 🕯️
Electric current = Ampere 💡
Temperature: Kelvin
Or any other correct answer
What is the relationship between force and momentum?
Force is the rate of change of momentum
( This is from Newton's 2nd law)
F = m( v-u)\t
State the principle of conservation of energy
Energy cannot be created nor destroyed but can be changed from one form into another
State Newton's 2nd Law
The force of a body is directly proportional to the product of the body's mass and acceleration
What is Newton's 2nd law as a formula?
Force = mass x acceleration
List 2 scientists and their quantity
1. Joule . Energy, Work
2. Coulomb. Electric charge
3. Newton . Force
4. Pascal . Pressure
List 3 types of forces
Magnetic, electrostatics, nuclear, resistive, gravitational, upthrust
List 3 types of energy and 3 sources of each type mentioned.
Kinetic energy : a ball moving
Sound energy: someone talking\ speaker 🔊
Thermal energy : a fire 🔥
Geothermal energy: volcanoes 🌋
Solar energy : the sun 🌞
Or any other good responses
State Newton's 1st law AND give and example of this
A body at rest remains at rest, or if in motion will continue to move with uniform velocity unless acted on by an external or unbalanced force.
Eg a ball at rest will move when someone kicks it
A body at rest , accelerates uniformly reaching a velocity of 30m\s in 4s. Calculate the acceleration
Acceleration= increase in velocity in unit time
Initial velocity= 0m\s, final velocity= 30m\s time taken = 4s
a = (30-0) \ 4
a= 7.5 m\s²
Two derived quantities are : momentum and density. What are the S.I units of each?
Momentum= kgm\s
Density = kg\m³
The moment of a force is defined as?
The turning effect which is the product of the force acting at a point and the perpendicular distance of the force from the pivot.