Speed, Velocity & Acceleration
It takes a student 30 seconds to move 90 meters to their classroom down the hall! What was their speed?
3 m/s
What is the acceleration due to gravity on earth?
9.8 m/s2
Remember that the formula for Newton's second law is F = MA! If Silas is driving a 66,800 kg tank and accelerating at 10 m/s2, what force is his tank moving with?
668,000 N of force
Which force resists changes in movement?
Inertia
Which collision has the kinetic energy conserved both before and after the collision?
Elastic Collision
Despite being similar, velocity is not the same as speed. How are they different?
Velocity is speed in a given direction.
When a roller-coaster is at the top of its ascent before dropping down and going around the track, what kind of energy does it have?
Potential Energy
In order to move something, you must do...
Work
Which force maintains movement and motion, depending on air resistance, friction, etc?
Momentum
Which collision has less kinetic energy afterwards, thanks to the object(s) changing shape or sticking together?
Inelastic Collision
What does it mean if something has a negative acceleration?
It is slowing down, or moving in the opposite direction
When Zahaira hits a volleyball over the net, what kind of energy does the volleyball have?
Kinetic Energy
Answer BOTH:
Gio and Kyle are both pushing a car along a flat road. Kyle is pushing with 250 N of force, Gio is pushing with 240 N of force. What is the net force?
Once they reach a hill, gravity is pushing back with 500 N of force thanks to the weight of the car. Think of going forward as the positive direction! What is the net force in this situation?
490 N
-10 N
Which force allows objects such as feathers to float? It also resists momentum, or acceleration! Hint, it is NOT inertia.
Air Resistance
When bouncing a rubber ball on the floor versus dropping a ball of clay that collapses on hitting the ground, which exerts a greater force? Why?
The rubber ball will, because the ball of clay will collapse to soften the impact versus the rubber ball bouncing off and exerting that exact same force in the opposite direction, maintaining kinetic energy.
While backing out of his parking spot in his fresh new Lamborghini, Yalwin travels about 10 meters in two seconds. What is his velocity?
-5 m/s
Mr. Platt has a mass of 60 kg. What would his weight in Newtons on the earth (9.8 m/s2) be? What about on Mars (3.70 m/s2)?
The formula for calculating this is:
W = mg
588 N on Earth
222 N on Mars
Andrew punches a punching bag with 3,500 N of force. How much force is being exerted back onto Andrew's fist and determine the action-reaction pair.
3,500 N of force is going back onto Andrew's fist. His punch is the action, and the swing of the punching bag is the reaction.
The formula for calculating momentum is P = mv!
If Jadiel is on a 450 kg motorcycle and is going at a velocity of 40 m/s on the highway, what is the momentum of his motorcycle?
18,000 kg * m/s
Why is it better for a car-crash to be inelastic than elastic? How have we designed our cars to make this happen?
Answers may vary!
While riding her bike on flat ground, Ari is pedaling and cruising at a speed of 6 m/s. However, she soon hits a downward slope, and starts rolling forward in two seconds at a speed of 12 m/s. What is her acceleration?
3 m/s2
Mr. Platt has a mass of 60 kg, and can jog for thirty minutes at an average of 2.5 m/s. What is his kinetic energy for this duration (use Joules, J)?
The formula for calculating kinetic energy is:
KE (Kinetic Energy) = (1/2)mv2
187.5 J
When one object in an action-reaction pair gains momentum, what should be happening to the other object?
It should also be gaining momentum, but likely in the opposite direction.
The formula for calculating momentum is P = mv!
The momentum of a falling cartoon anvil, dropped by Jayden to try and crush Jack, is 150,000 kg * m/s!
If the anvil weighs 50 kg, what is its velocity?
3000 m/s
After a character gets Isekai'd, the traumatized trucker manages to brake their 11,000kg truck - Which was moving at 20 m/s - In 10 seconds. What braking force was exerted to make this happen?
The formula for calculating this is:
Ft = mv2 - mv1
110,000 N