Forces
a push or pull that acts on an object
Force
What is inertia?
An object's resistance to change in motion.
If no net force is acting on a system, then the total momentum of the system is conserved.
Law of Conservation of Momentum
What force can attract and repel?
Electromagnetic Force
What universal force is the weakest?
Gravitational Force
the force that causes a 1-kilogram mass to accelerate at a rate of 1 m/s2
a Newton
What is the difference between mass and weight?
Mass is the amount of matter in an object. Weight is the force of gravity acting on that mass.
What is the formula for momentum?
Momentum = Mass x Velocity
This force is a powerful force of attraction that acts only on the neutrons and protons in the nucleus, holding them together.
Strong Nuclear Force
The gravitational force between two objects increases as mass
increases
What are the four frictions in action on an object?
Static Friction, Sliding Friction, Rolling Friction, Fluid Friction
State Newton's 1st Law.
An object at rest remains at rest, and an object in motion remains in motion, unless acted upon by an unbalanced force. (Net force greater than zero)
What is Newton's third law of motion?
For every action, there is an equal and opposite reaction.
What is centripetal force?
A center-directed force that continuously changes the direction of an object to make it move in a circle.
Which has greater momentum: an eagle with a mass of 6 kg with a velocity of 150 m/s or a golf ball with a mass of .045 kg and a velocity of 19,000 m/s?
The Eagle
How do forces affect the motion of an object?
When an unbalanced force acts on an object, the object accelerates.
What is the formula for Newton's 2nd law?
Force = Mass x Acceleration or
Acceleration = Force/Mass or
Mass = Force/Acceleration
How is momentum conserved?
In a closed system, the loss of momentum of one object equals the gain in momentum of another object - momentum is conserved.
What is Newton's law of universal gravitation?
Newton's law of universal gravitation states that every object in the universe attracts every other object.
A human person is playing soccer and just straight up karate kicks the ball (.5 kg) sending it off with a momentum of 740,500 kg*m/s. How fast is that bad boy flying?
1,481,000 m/s
Why does a projectile follow a curved path?
The combination of an initial forward velocity and the downward vertical force of gravity causes the object to follow a curved path.(Projectile Motion)
Find the weight of an object with a mass of 17 kg.
166.6 N
Use action and reaction forces to explain how a swimmer moves through the water.
The action and reaction forces do not act on the same object.
What happens to the force of gravity if the distance doubles?
The force of gravity is only one-forth as strong.
What is the acceleration of a 24 kg mass pushed with a force of 8N?
.33 m/s2