Forces
What is the force in a string called?
Tension (T)
What is the SI unit for acceleration?
m/s2
The Shanghai maglev train connects Longyang Road to Pudong International Airport, a distance of 30 km. The journey takes 8 minutes on average. What is the maglev train’s average velocity in SI units?
62.5 m/s
What is a scalar with direction?
A vector
What does a projectile motion depend on?
vinitial and the angle
Two friends are jogging together. One brought a backpack. If they are both accelerating by the same amount, who is exerting a greater net force?
The friend with a backpack has more mass so to get the same acceleration they have to use more force
1*10-2m is also known as what unit?
centimeter (cm)
If your books are around 10 lbs, what is their mass in kg?
1 kg=2.2lbs
4.45 kg
What is the difference between falling normally and free fall?
Free fall specifically is falling only in the presence of gravity while falling normally has air resistance
Why does weight change when you visit another planet?
W=m*g but the value of g changes with different planets
Give an example of Newton's 3rd Law
For every force, there is an equal and opposite reaction force that occurs simultaneously
An example is when you push on the Earth to jump, the Earth pushes back on you making you go up
The si unit for rotational displacement is ___
Radian
A cleaner pushes a 4.50-kg laundry cart in such a way that the net external force on it is 60.0 N. Calculate the magnitude of his cart’s acceleration.
13.3 m/s2
When terminal velocity is met, what is the acceleration?
Acceleration is 0 because the air resistance force is = to the weight and there is no net force
What would happen if the moon didn't have a large tangential speed?
It would fall into Earth
If an object is at rest on an incline plane, what direction is the weight?
Straight downwards
What is 6 µm in meters?
6*10-6 m
0.000006 m
On the way to ICC I took the merge ramp and experienced a centripetal acceleration of 10 N. If the circle made by the ramp had a radius of 30m, just how fast was I taking that curve?
ac=v2/r
17.3 m/s
Besides matter, what does mass measure?
Inertia
What does terminal velocity depend on?
Speed and "front" surface area
Draw a free body diagram of someone pushing a shopping cart. Label all of the forces.
Force applied
Friction
Weight
Normal
What are the units for N?
kg*m/s2
On the way to ICC I took the merge ramp and experienced a centripetal acceleration of 10 m/s2. If the mass of my car was 1300 kg and the radius of the curve was 40m and I was going 20 m/s what was the magnitude of the centripetal force I experienced?
F=ma
or
FCentripetal=m*v2/r
What is the difference between "G" and "g" when referring to gravity?
G refers to a universal constant of gravity with the units of m3/kg*s
g refers to specifically the acceleration of gravity caused by gravitational force, and on Earth it's approximately 10m/s2
At what point is the speed the lowest in a projectile motion?
At the maximum height, where there is no y velocity only x