FORCES
What does a Free Body Diagram tell you?
Tells you all the forces acting on the object.
What is the formula for finding Impulse?
Force X Delta(Δ) Time
Work=J Power=W
Newtons 1st Law
What is this symbol's name? (θ)
Theta.
Define Applied Force
A Force exerted on objects.
Define the Conservation of Momentum in layman's term.
The total Force will stay the same before and after a anything happens, like a collision.
As a ball falls freely (without friction) toward the ground, its total mechanical energy
a) Decreases
b) Can't be determined
c) Remains the same
d) Increases
c) Remains the same
A student pushes a cart with a constant force of 20 N. The cart has a mass of 10 kg. Using
Newton’s Laws, which explanation best describes how the force affects the cart’s acceleration?
A. The cart will not accelerate because the force is balanced.
B. The cart accelerates at 2 m/s² because acceleration depends on both force and mass.
C. The cart accelerates at 20 m/s² because acceleration equals the applied force.
D. The cart moves at a constant velocity because Newton’s First Law says objects resist
changes in motion.
C. The cart accelerates at 20 m/s² because acceleration equals the applied force.
13. Which of the following scenarios is possible for the resultant velocity of an airplane in a strong wind to be 150 m/s?
A. The wind is blowing at 10 m/s. The airplane is flying against the wind at 140 m/s.
B. The wind is blowing at 20 m/s. The airplane is flying with the wind at 130 m/s.
C. The wind is blowing at 50 m/s. The airplane is flying against the wind at 100 m/s.
D. The wind is blowing at 200 m/s. The airplane is flying with the wind at 50 m/s.
B. The wind is blowing at 20 m/s. The airplane is flying with the wind at 130 m/s.
A box of mass 10 kg is pulled to the right with a force of 40 N, while friction resists with 10 N to the left. Which Free Body Diagram description is correct?
The net force is 30 N to the right, so the box accelerates rightward.
The diagram below shows two balls of equal mass. Ball X is moving toward Ball Y at 2 m/s and Ball Y is at rest.
When ball X collides with ball Y, ball X stops moving. Which of the following best describes the motion of ball Y after the collision?
A: It will remain at rest.
B: It will move to the right at 0.5 m/s.
D: It will move to the right at 4 m/s.
C: It will move to the right 2 m/s.
Which action would require no work to be done on an object?
a) holding the object stationary above the ground
b) pushing the object along a horizontal floor against a frictional force
c) lifting the object from the floor to the ceiling
d) decreasing the speed of the object until it comes to rest
a) holding the object stationary above the ground.
A box of mass 10 kg is pushed to the right with a force of 40 N, while friction exerts a force of 10 N to the left. What is the box’s acceleration?
a) 0.5 m/s 2
b) 3.0 m/s 2
c) 4.0 m/s 2
d) 10.0 m/s 2
b) 3.0 m/s 2
What is the difference between a Scaler and a Vector?
Scaler tells Magnitude. Vector tells Magnitude with a Direction.
If an object is sliding down an inclined plane with friction, which direction does the friction force point in the free body diagram?
A. Down the incline, opposite to motion
B. Up the incline, opposite to motion
C. Perpendicular to the incline, toward the surface
D. Vertically upward
B. Up the incline, opposite to motion.
What is the unit for Impulse?
Kg X M/S
What unit is used to determine the energy consumption for American homes?
Kilowatts/KWH
Which statement best describes Newton’s 3rd Law of Motion?
a) Forces always act in pairs that are equal and opposite.
b) An object will remain at rest unless acted upon by a force.
c) Acceleration depends on mass and net force.
d) Energy cannot be created or destroyed.
a) Forces always act in pairs that are equal and opposite.
Which of the following variables would you need in order to calculate how long it would take a horizontally launched projectile to hit the ground?
A. The horizontal velocity and the height of the object
B. The height and the weight of the object
C. Only the horizontal velocity of the object
D. Only the height of the object
D. Only the height of the object
Name ALL types of forces. Hint: There's 10.
(Points are DOUBLED if correct)
Applied,Tension,Gravity,Thrust,Lift,Buoyant,Push,Pull,Friction,Normal.
(POINTS ARE DOUBLED)
A student initially at rest on a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other direction. Which of the following correctly describes the above situation?
A: The hammer will have the momentum with the greater magnitude
B: The student will have the momentum with the greater magnitude
C: The hammer will have the greater kinetic energy
D: The student will have the greater kinetic energy
C: The hammer will have the greater kinetic energy
A student swings a bat horizontally and makes contact with a ball. The ball leaves the bat, and the bat continues moving through the rest of the swing. Which of the following statements BEST describes the change in energy necessary to do work on the ball?
A. All the kinetic energy of the bat is converted to do work.
B. All the potential energy of the bat is converted to work.
C. Some of the Kinetic energy is converted to work
D. Some of the potential energy of the bat is converted to work.
C. Some of the Kinetic energy is converted to work
(POINTS ARE DOUBLED)
Define Inertia.
The resistance of the object to change into a different state.
EX: If a car is in motion, Inertia wants the car to stay in that motion at a constant. It does not want to change.
What formula do you use to find the resultant.
R= sqrt(opp)^2+(adj)^2