Basic Ratios
If a car is moving at a speed of 70 km/hr for 20 minutes, how far has the car driven?
If a car travels a distance of 150 km in 3 hours what is the average speed?
average velocity = distance / time
Ac = (velocity)^2 / radius
If 2 N of force is applied to lift an object 5 meters, how much work is done?
Work = force x distance
If a biker pedals with a force of 13 N and weighs 60 kg, what is his acceleration?
acceleration = force / mass
If the diameter of a circle is 2 cm, what is the circumference?
circumference = pi x diameter
If a driver accelerates their car from 60 mph to 80 mph in the matter of four seconds, what is their acceleration?
acceleration = change in velocity / time elapsed
What is the magnitude of the force of a 2 kg object moving in a circular motion with velocity 3 km / s and radius of 7 m?
Centripetal force = (mass x velocity^2) / radius
if a backpack of 50 grams is carried up a flight of stairs 10 m in height, what work was done?
W = mgh
What are the units of a Newton?
(Kg x m) / s^2
If a block has a mass of 135 g and and a volume of 50.0 cm^3. What is its density?
density = mass / volume
If a stone is being pushed with the force of 18N, but the force of opposing frictions is 2N, what is the net force on the stone?
net force = applied force - frictional force
What is the force of gravitational attraction between two 60.0 kg students who are standing 1 m apart?
F = G(mass1 x mass2) / distance^2
If 6 J of work was performed over a period of 12 seconds, how much power was used?
P = work / time
What is the change in momentum of a ball that is struck with a force of 22 N over a time period of 1.2 seconds?
Impulse = Force x time
If a gas pump has a flow rate of 40 L / min, how much fluid is in the tank after 4 minutes?
Volume = time x constant
If a ball is released from the top of a building and falls for 12 seconds (is only acted upon by the force of gravity), how far did the ball travel before hitting the ground?
distance = 1/2 acceleration x time^2
The surface of the earth is approximately 6400 km from its center, if the earth is 6.0 x 10^24 kg what is the acceleration due to gravity?
gravity = G(mass of earth) / distance ^2
How much gravitational potential energy does a book of mass 20g grams have on a shelf of 12 m ?
PE = mgh
If a person were to weigh 80 kg on earth, how much would they weigh on the moon where the force due to gravity is 1.62 m / s^2?
weight = mass x gravity
If a cube has a surface area of 24 cm^2 and a surface area to volume ratio of 3, what is the volume?
Surface area / volume = constant
If a runner who was initially running at 4 km/hr accelerated by a rate of 0.02 km/s^2 for 8 seconds, how fast are they running?
velocity final = (acceleration x time) + velocity initial
if an object on a string of 1.5 m is moving with an acceleration of 9 m/s^2 , what is the object's velocity?
v = sqrt (acceleration x radius)
How much Kinetic energy does a bowling ball of 50 grams have if it is rolling with a velocity of 6 m/s?
KE = 1/2 mv^2
If a car of mass 20000 kg moving with a velocity of 3 m/s collides with a car of 18000 kg at rest, what is the final velocity of both cars?
velocity final = (mass1 x velocity initial) / (mass 1 + mass 2)
Momentum = mass times velocity