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71 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is the equation for Force?
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F=ma
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What is the name of the unit for measuring force?
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Newtons (N)
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What is the equation for Speed?
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S=d/t Speed is equal to distance divided by time
The units are meters per second or m/2 |
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What is the equation for work?
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Work is equal to force x distance. W=fd
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What is the unit of measurement for Work?
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newton-meter's or joules
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Definition of Force:
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simply push or pull, it is equal to f=ma
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How many types of forces are there? Name them.
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2 types - balanced and unbalanced
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What are the two things you need to know to describe force?
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1. The size or strength of the force
2. The direction of the force |
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Motion - describe it
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When something moves
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Gravity-describe it
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A type of force of attraction between all objects in the universe - Things fall back to the Earth surface because of gravity. For example, if you are holding an American Girl doll and you drop her, she falls to the floor
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Who was Sir Issac Newton
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He was a person who wondered why all objects fell to the ground. He hypothesized that there is a force that makes all objects move toward each other.
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What is Newton's Law of Gravity?
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The idea that there is a force that makes all objects move toward each other.
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Newton's 1st Law of Motion
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An object will remain at rest or move at a constant speed in a straight line unless it is acted on by an unbalanced force.
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Newton's 2nd Law of Motion
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The unbalanced force acting on an object is equal to the mass of the object times its accelleration. F=ma
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Newtons 3rd Law of Motion
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For every action force, there is an equal and opposite reaction force
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Motion is caused by....
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Force - It takes force to cause motion. For example, you can't get a ball to move unless you hit it or kick it.
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What is the definition of balanced force?
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Forces that are equalin size and oppositein direction. Remember, if balanced forces act on an object, they don't make the object move.
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Define unbalanced forces
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Unequal forces cause a change in the objects motion
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Net force -What is it?
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The total of the forces action on an object.
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What is the equation for Force?
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Force = mass x acceleration
F=ma |
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what is MASS?
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Mass is anything that has matter and takes up space - like me or a chair or water or gass
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What is the smallest unit of matter? What is the smallest thing that takes up space?
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Atom
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What are the three subatomic particles in an atom?
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Protons, neutrons, and electrons
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Which part of an atom, which subatomic particle is positive and found in the nucleas of the atom?
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protons
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Define a proton?
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A proton is a subatomic particle in an atom. It has a positive charge and is found in the nucleus of the atom.
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Define a neutron?
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A neutron is neutral and has no charge at all it is found inside the nucleus of an atom
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What is an electron?
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Electrons have a negative change and are found OUTSIDE of a the nucleus of the atom orbiting in the electron cloud
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Reference point
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A fixed place or object used to determine if an object is in motion
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Speed
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How fast something moves - It is distance traveled per unit of time
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What is the SI unit for measuring distance?
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Meters (m)
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Draw an atom and label the protons, neutrons and electrons
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draw
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Describe an example of Newton's 1st law
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describe
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Describe an example of Newton's second law
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describe
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Describe an example of Newton's third law
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describe
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What is a Newton?
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A newton is the unit for measuring Force. F=ma
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Define Velocity
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Speen in a given direction 25 km/hr east
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25mph Is that a speed or a velocity?
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speed
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25 mph west Is that a speed or a velocity
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velocity.
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True or False:
When unbalanced forces act on a moving object, the motion of the object will stay the same |
False
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True or False: An example of magnetic force is a paperclip sticking to a magnet
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True
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What is motion?
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Motion is when something moves. Motion is when an object changes in position relative to some fixed object
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Inertia
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The tendency of a body to resist acceleration
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Reference point
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A place or object used to determine if an object is in motion.
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Motion is when the distance between two objects:
a) gets larger b) gets smaller c) changes d) stays the same e) all of the above f) b,c, and d g) a, b,and c |
g
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Stationary object
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an object that does not appear to be in motion
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centripetal force
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the type of force that keeps objects moving in a circle
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What is the unit of measure for force?
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Newton
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Define kinetic
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The energy of motion
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What is the formula for momentum?
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momentum is p
p=mass x velocity Momentum depends on the mass and velocity of an object. |
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accelleration
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The rate at which velocity changes over time.
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inertia
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the tendency of a moving object to keep moving
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Mass
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amount of matter in an object
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weight
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amount of force exerted on an object due to gravity
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How do you figure out average speed
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The total distance traveled divided by the total time.
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define Instantaneous speed
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The rate at which an object is moving at a given instant in time
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Explain graphing motion and draw a picture with labels for time, distance, with a slope
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On a motion graph, the x axis is time. The y axis is distance. The slope tells how fast one variable changes compared to the other variable
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If the slope is steep on a motion graph is the object moving fast or slow
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fast
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With what force will a car hit a tree if the car has a mass of 2000 kg and is accelerating at a rate of 2m/s?
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show your work
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A 10 kg bowling ball would require what force to accelerate it down an alleyway at a rate of 3m/s?
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show your work
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What is the mass of a falling rock if it hists the ground with a force of 147 newtons?
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show your work
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What is the acceleration of a softball if it has a mass of 0.50 kg and hits the catcher's glove with a force of 25 newtons?
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show your work
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What is the mass of a truck ifit is accelerating at a rate of 5 m/s and hits a parked car with a force of 14,000 newtons?
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show your work
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Forces are described by
a) strength b) distance c) direction d) a and c e) b and c f) a, b, and c |
d
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Do balanced forces acting on an object make the objects motion change?
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No
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What is the result of unbalanced forces acting on an object
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Unbalanced forces acting on an object result in NET FORCE and that cause a CHANGE in the objects motion
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Netforce = 0
If netforce is equal to 0 is it a balanced force or an unbalanced force acting onthe object? |
balanced
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Netforce is not equal to zero. What kind of force is acting on the object
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unbalanced
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Which type of force causes an object's motion to change?
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unbalanced force
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which type of force causes a net force of 0
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balanced force
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Define net force
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the total of the forces acting on an object
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You can describe a force using arrows. I see two arrows. One is long and one is short. Which force is stronger?
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The long arrow
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