Vocabulary
A push or pull an object exerts on another.
Force
Riding on a bus. When the bus stops suddenly, people fall forward.
Newton's first law
Newton’s __________ law of motion is also known as the law of inertia.
first
If you push a 20 kg box with a force of 80 N, what is its acceleration?
4 m/s2
Force can be expressed as kg • m/s.
False - it's kg • m/s2.
The force of gravity on an object.
Weight
Kicking a soccer ball. The harder we kick the soccer ball, the more force we apply, and the farther the ball goes.
Newton's second law
Newton’s __________ law of motion relates acceleration to force and mass.
second
How much force is required to transport an 18 kg of bricks at 3 m/s2?
54 N
Net force is the combination of all the forces acting on an object.
True
The resistance an object feels when traveling through the air. "Friction of the air"
Rowing a boat. When you push the water backward, there is an equal and opposite force generated which causes forward motion.
Newton's third law
According to Newton’s __________ law of motion, every action has an equal and opposite reaction.
third
Given a force of 360 N and an acceleration of 6 m/s2. What is the mass of the bowling ball?
60 kg
An object’s motion will change only if an unbalanced force acts on the object.
True
Forces between two objects that are not moving past each other.
Static friction
Riding a skateboard. When you push back on the ground with your foot, the ground pushes you forward.
Newton's third law
__________ is a measure of the force of gravity pulling on an object of a given mass.
weight
If you apply 10 N of force to a 10 kg object, what will be the object’s acceleration?
1 m/s2
It is easier to stop a 60 kg football player than a 40 kg football player if they have the same velocity.
False - it is harder
Occurs when the force of air resistance and gravity become balanced.
Terminal velocity
Rolling a marble. If you roll it on a smooth floor, it keeps rolling until something, like a wall, stops it.
Increasing the net force on a given object __________ the object’s acceleration.
increases
How much force is required to move a 800 kg fishing boat at 10 m/s2?
8,000 N
If you know an object’s mass, you also know its weight because mass and weight measure the same thing.
False - they do not measure the same thing