1st Law
Give the formal definition for Newtons First Law of motion.
An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. (Or something close to this)
State the definition of Newton's Second law of motion The force acting on an object is equal to the mass of that object times its acceleration.
The force acting on an object is equal to the mass of that object times its acceleration. (Or something similar to this)
An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Newton's 1st law
What is the name of the force of a hand pushing on a box?
Applied Force
A vector quantity has both magnitude and a specific direction. (velocity, acceleration, force, weight...)
Scalar quantities have only magnitude. (mass, speed, volume, temperature...)
What will your body tend to do if you hit a wall with your car.
Objects ________ in the direction that you apply a force to.
Accelerate
A spaceship is traveling through empty space at 100,000 kph. A rocket is turned on pointing forward that causes the rocket to negatively accelerate. After the rocket is turned off, the ship is now moving at 90,000 kph.
Newton's 2nd law
What is the force that directly opposes the applied force on an object?
Frictional Force
Why is it harder for a car to accelerate than a motorcycle?
According to Newton's 2nd Law, a=F/m
If we increase the mass of an object without increasing the force applied on it, the object will accelerate slower because mass is on the denominator.
What must the net force acting on an object be for the object to experience Newton's 1st Law?
Zero net force acting on the object.
A car is constantly accelerating at a rate of 1.15 m/s^2. If the car has a mass of 1,000 kg, how much force must the engine supply?
1150 Newtons of force
This law is sometimes referred to as the law of inertia.
Newton's First Law
What is the term for the combination of all force vector quantities acting on an object?
The Net force
What is the difference between an object's mass and its weight?
An object's mass is the physical amount of matter that makes up of the object. An object's mass is the gravitational force acting on the objects mass causing it to become attracted to the center of mass of that gravitational object.
Because the Net force acting on the bowling ball is 0, the bowling ball will remain stationary according to Newton's 1st law.
Tim pulls his wagon with a force of 39 newtons of force at an angle of 30 degrees. If the wagon has a mass of 10kg, what is the x component of the wagon's acceleration?
SohCahToa
Cos(30)=x/39N
(39)Cos(30)= 34N
F=ma 34N=(10kg)a a=3.4m/s/s
3.4m/s/s
A truck accelerates at 1.2m/s/s for 10 seconds to get on a highway. Once he has gotten up to speed, he maintains this speed and direction. Describe which Newtonian Laws are acting when. (Assume frictionless environment for the sake of the question)
What is the attraction force between two objects of mass? What would the force acting on a 100kg person be if the second object accelerates him at 18m/s/s towards itself?
Fg=ma
Fg=(100kg)(18m/s/s) = 1800 Newtons of force
You would like to make your car accelerate at a faster rate, what are two things you can change about your car to achieve your goal?
1. You could upgrade your engine to increase the amount of force that your car produces.
2. You could reduce the mass of your car.
A rocket is using his rockets to make a turn in space while also traveling at 10,000kph. If the rocket turns off his boosters in a split second, describe the motion of the rocket.
Because of Newton's 1st Law, the rocket will continue in a perfectly straight line at 10,000kph in the precise direction the rocket was traveling when the booster was turned off.
Correct answers must include at least 2 different applied forces with different angles, gravitational force, normal force, free body diagram, and the objects final acceleration.
A 50kg skateboarder pushes himself with a force of 100 Newtons. If the frictional force on the skateboard is 40 Newtons:
A. Calculate the Net force acting on the system.
B. Calculate the acceleration of the skateboarder.
C. Define the Newtonian Law that this situation uses.
A. (100N-40N=60N) 60 Newtons of force in the direction of the skateboarders travel.
B. F=ma 60N=(50kg)a a=1.2m/s/s
C. Newton's 2nd law
A 100kg box is sliding down a frictionless 20 degree ramp. What is the force that is preventing the box from falling through the platform and what is the quantity of this force?
Normal force.
mg*cos(angle) = (100)(9.81)cos(20)= 922 Newtons
A 1000 kg unmanned self-driving car is traveling down the road and has a head on collision with a 10,000 kg semi truck. Both are traveling at a constant velocity. Consider friction to be in effect.
A. Construct 2 free body diagrams of the vehicles before the impact.
B. Construct 2 free body diagrams of the vehicles during the impact.
C. Construct 2 free body diagrams of the vehicles after the impact. (assume both have come to a complete stop)
A. Both FBD should include gravitational force, normal force, frictional force, and applied force.
B. Each FBD should include gravitational force, normal force, frictional force, and applied force of the other vehicle on it. (each applied force should be identical even with the mass differences)
C. Both FBD should include only gravitational and normal force.