Force Basics
The unit used to measure force?
What is a Newton?
Newton's law that explains why you fly forward when a car stops suddenly.
What is Newton's 1st Law (inertia)
The formula for acceleration.
What is a = vf - vi / t?
The force that pulls objects toward Earth.
What is gravity?
This is why seatbelts are required (by law) in cars.
What is inertia?
A push or a pull is the simplest definition of this term.
What is a force?
The law that states acceleration relies on force and mass
What is the 2nd Law?
A 20 N force is applied to a 5 kg object. Calculate its acceleration.
What is 4 m/s2?
The acceleration due to gravity on Earth.
What is 9.8 m/s2?
A rocket lifts off the ground using Newton’s 3rd Law. Identify the action force.
What is the rocket pushing gases downward?
This net force value means an object is not accelerating.
What is zero?
According to the 3rd law, every action force has one of these.
What is an equal and opposite reaction force?
A 50 kg student accelerates at 3 m/s². What net force acts on them?
What is 150 N?
Your mass on the Moon stays the same, but this value becomes smaller.
What is weight?
When a soccer ball slows down after being kicked, name the main force causing the slowdown.
What is friction/air resistance?
The type of force that acts opposite motion and generates heat.
What is friction?
According to the 1st Law, this is needed to change an object’s motion.
What is an unbalanced force?
A skateboarder increases speed from 2 m/s to 10 m/s in 4 seconds. Calculate acceleration.
What is 2 m/s²?
Weight is calculated by multiplying mass by this quantity.
What is gravitational acceleration (g)?
A kid riding a sled goes down a hill. Describe two forces acting on the sled as it moves.
What is gravity pulling the sled downhill, and friction resisting the forward motion?
The force that prevents two solid surfaces from sliding past each other.
What is static friction?
Name the two forces acting in the classic “book resting on a table” example.
What are gravity (weight) downward and the normal force up?
A 10 kg object has three forces acting on it: 30 N right, 10 N left, and 5 N right. Calculate the acceleration.
What is 2.5 m/s² to the right?
An astronaut has a mass of 70 kg. Calculate their weight on Earth.
What is 686 N?
A car going 60 mph hits a patch of ice and loses traction. Explain which force suddenly drops.
What is friction (specifically static friction with the road)?