Theory 1
The force that a gravitational field exerts on an object.
What is weight?
A 3D sphere of influence caused by gravity.
What is a field?
A force applied on a cardboard box caused it to stop moving to the right and start moving to the left.
<(^.^)>
Two people, A and B, are sitting on a bench 0.60m apart. Person A has a mass of 55kg and person B has a mass of 80kg. Determine the force of gravity between A and B.
mA=55kg
mB=80kg
r=0.60m
g=9.81m/s2 [down]
Fg=?
Calculate the acceleration of a 1478kg car if it experiences a net force of 3100N [W].
What is 2.097m/s2 [W]?
Named after the writer of Philosophiæ Naturalis Principia Mathematica, this derived unit is used explain forces.
What is a newton?
If object A exerts a force on object B, then B exerts a force on A that is equal in magnitude and opposite in direction.
What is Newton's third law?
The forces between earth and the moon.
Did Picasso draw this?
Total weight of a biker and bike is 1800N. The road exerts 500N as friction on the tires while there is an air resistance of 200N. If the normal force exerted on the bike is 1800N, determine the mass of the bike and biker.
Fg=1800N [down]
Ffs=500N [backwards]
Ffk=200N [backwards]
FN=1800N [up]
g=9.81m/s2 [down]
m=?
The moon is 3.84x105km away from the surface of the earth. Determine the gravitational field strength earth exhibits on it.
What is 2.61x10-3N/kg?
What is static friction?
The device used by Henry Cavendish to calculate G.
What is a torsion balance?
Forces on the moon by the earth and sun during a solar eclipse (moon is perfectly in between the sun and earth)
Wow Mr. B, go you!
An 80kg astronaut is standing on a scale in a rocket leaving the surface of the moon. The acceleration of the rocket is 12.8m/s2 [up]. On the moon, the gravitational field is 1.62N/kg [down]. Determine true and apparent weight.
m=80kg
a=12.8m/s2 [up]
g=1.62N/kg [down]
Fg=?
FN=?
A load is placed on a 1.5kg cart. A force of 6.0N [left] causes the cart and its load to have an acceleration of 3.0m/s2 [left]. What is the inertial mass of the load?
What is 0.50kg?
The variables required to calculate gravitational field strength.
What is universal gravitational constant, mass of the source, and distance from centre of object creating the field?
When an object is on an incline, this force opposes the force of gravity parallel, as it is sliding down the incline.
What is kinetic friction?
An oak block on a horizontal surface is attached by a pulley system to a cannon ball hanging over the left side of the table. The pulley is frictionless while the table is not. The block is moving
Banksy has done it again!
A loonie with a mass of 7.0g is taped on top of a toonie of mass 7.3g. The combination stays at rest on an incline of 30o. Determine the force of static friction.
mL=7.0g
mT=7.3g
angle=30o
g=9.81m/s2 [down]
Ffs=?
A person exerts a force of 1.5N [right] to pull a 2.0kg block of glass at constant velocity along a horizontal surface on the moon (gmoon=1.62m/s2). Determine the coefficient of kinetic friction.
What is 0.46?
When an external non-zero net force acts on an object, the object accelerates in the direction of the net force. The magnitude of the acceleration is directly proportional to the magnitude of the net force and inversely proportional to the mass of the object.
What is Newton's Second Law?
The units for gravitational field strength (N/kg), expressed in terms of simplified fundamental units.
What is m/s2?
Nice picture!
Mars has two moons. Deimos and Phobos. Deimos has a mass of 2.38x1015kg and its distance from Mars is 2.3x107m. Phobos has a mass of 1.1x1016kg and its mean distance from Mars is 9.4x106m. Determine the net force exhibited on Mars.
mD=2.38x1015kg
mP=1.1x1016kg
rDM=2.3x107m
rPM=9.4x106m
Fnet=?
A 60kg skydiver falls towards Earth with an unopened parachute. The air resistance acting on the sky diver is 200N [up]. Determine the true weight and acceleration of the skydiver.
What is 5.9x102N [down] and 6.5m/s2 [down]?