Types of Forces
This SI unit is used to measure force, defined as equal to 1 kg·m/s²
What is Newton (N)?
Defined as the tendency of an object to resist changes in its motion, this concept was originally developed by Galileo.
What is Inertia?
State the primary formula equation that defines Newton's Second Law of Motion.
What is Fnet = m · a?
Newton's Third Law is commonly known by this title summarizing its relationship.
What is The Law of Action-Reaction?
Distinguish between Static Friction and Kinetic Friction.
What is static friction involving object at rest, and what is kinectic friction involving object in motion?
Forces are classified into two main categories: Contact forces (like friction). What is the category for these forces that act without physically touching?
What are Field Forces or Non-Contact Forces?
An object's inertia is directly proportional to this scalar property.
What is mass?
Find the net force required to accelerate a 50.0 kg crate to the right at 3.50 m/s².
What is 175 N to the right?
If Action: A person's foot pushes the ground backward while walking, identify the reaction force.
The ground pushes the foot forward?
State the formulas for calculating Parallel (Fgx) and Perpendicular (Fgy) components of gravity on an inclined ramp.
What is Fgx = Fg · sin(θ)? And what is Fgy = Fg · cos(θ)
This specific support force is exerted by a surface and always acts perpendicular to that surface.
What is Normal Force?
True or False: If the net force on an object is zero (Fnet = 0 N), the object MUST be at rest.
What is False?
What is the difference between mass and weight? Include their symbols/units.
What are mass (m) and kg, and what are weight (gravitational force) (Fg) and newton?
Explain why action-reaction force pairs do NOT cancel each other out.
They act on TWO DIFFERENT objects!
The two factors that affect friction
What is surface material and what is normal force?
A force is a vector quantity because it possesses both of these two fundamental characteristics?
What is magnitude and what is direction?
Calculate the net force on a box pulled left with 5 N, right with 10 N, up with 10 N, and down with 10 N.
What is 5 N to the right (Unbalanced)?
A 55.0 kg person stands on Earth (g = -9.81 m/s²). Calculate their gravitational force (weight).
What is 5.40 x 10^2 N downward?
A 5.00 kg bat hits a 0.250 kg baseball with a force of 20.0 N. Compare the force experienced by the bat versus the ball.
They experience the exact SAME force (20.0 N), but different directions.
A 75.0 kg desk rests on a floor with μs = 0.400. Calculate the minimum horizontal force needed to get it moving to the right. (5 minutes to solve)
What is greater than 294 N to the right?
Name all four distinct effects that an applied net force can have on an object's motion or state.
What are:
1. Start moving or stop moving
2. Speed up or slow down
3. Change Direction
4. Change shape
State the complete statement of Newton's First Law of Motion.
What is "An object at rest stays at rest, and an object in motion stays in motion at a constant velocity unless acted upon by an unbalanced external force."?
A brick has a weight Fg = 40.0 N. If a net force of 5.00 N acts horizontally on it, find its acceleration. (5 minutes to solve)
What is 1.23 m/s2?
If Earth pulls down on a boy with 589 N, state the magnitude and direction of the reaction force exerted by the boy on Earth.
What is 589 N UPWARDS on the Earth?
A 35.0 kg crate slides down a 43.0° ramp accelerating at -3.45 m/s². Calculate the coefficient of kinetic friction (μk). (7 minutes to solve).
What is μk = 0.450?