Newton's Laws of Motion
What is the formula for calculating force?
Force = mass x acceleration
What is the formula for calculating velocity?
v = Δx/Δt
What is the formula for calculating weight?
W=mg
(Weight = mass x gravitational acceleration)
What is the formula for centripetal force?
Fc=mv2/r
(Force = mass x velocity squared ÷ radius)
That is the formula for torque?
𝜏 = Fr
(Torque = force x lever arm length)
Which law that states an object's velocity will remain constant unless it is acted upon by a net external force?
Newton's First Law (The Law of Inertia)
What is the formula for calculating acceleration?
a = Δv/Δt
What units are used to measure weight, as it is a measure of force?
N or lb
(Newtons or pounds)
What is the direction a centripetal force must always point?
towards the center of rotation
Which class of lever is represented by a wheelbarrow, where the Load is between the Fulcrum (wheel) and the Effort (handles)?
second class lever
What physical property is directly proportional to the force applied and inversely proportional to the mass of an object?
acceleration
What are the standard SI units for velocity and acceleration?
m/s and m/s2
What is the difference between mass and weight?
Mass is the amount of matter, and weight is the force of gravity acting on that mass
What is the name of the apparent, outward-pulling force experienced by a person spinning on a carousel?
centrifugal force
What is the amount of torque generated by a person pushing a 1.5 m wrench with a perpendicular force of 80 N?
120 Nm (Newton meters)
Which law that explains why a rocket must push down on its exhaust gases to accelerate upward?
Newton's Third Law (Law of Equal and Opposite)
A runner travels 500 meters north in 80 seconds. What is their average velocity in m/s?
6.25 m/s north
What is the weight of a 7 kg bowling ball on Earth?
68.67 N
What is the physical force that facilitates the centripetal force that keeps the Moon orbiting the Earth?
gravitational force
How much force must a person apply to the end of a 2 m lever arm to produce a torque of 100 Nm?
50 N
Which law explains why a baseball thrown by a professional pitcher accelerates much faster than a bowling ball thrown with the same force?
Newton's Second Law (because mass and acceleration are inversely related)
A motorcycle starts from rest and accelerates at a constant rate of 5 m/s2 for 4 seconds. What is the motorcycle's final velocity? (Use the equation: vf = vi + at)
0 + (5 m/s2 • 4 s) = 20 m/s
What is the mass of an object whose weight is 350 N on Earth?
35.68 kg
What principle explains why an object swung on a string will fly off in a straight line, tangent to the circle, if the string is suddenly cut?
inertia
What is the minimum force required to lift a 300 N load in a wheelbarrow, where the load is 0.6 m from the wheel and the hands are 1.5 m from the wheel?
120 N
(Feffort x reffort = Fload x rload)