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40 Cards in this Set
- Front
- Back
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change in position, direction and speed relative to another object indicates
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motion
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distance/time
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speed
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What is acceleration?
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change in velocity
(change in speed or direction) |
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What is velocity?
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speed and direction
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What is the equation for acceleration?
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final velocity - initial velocity/time
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If a car accelerates from 5 m/s to 15 m/s in 2 seconds, what is the car's average acceleration?
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5m/s/s
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How long does it take to accelerate an object from rest to 10 m/s if the acceleration was 2 m/s2?
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5s
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Carl started to run at 10 km/h when he left his house. He arrived at school 30 minutes later. How fast was he running when he arrived there? Assume that his average acceleration was 30 km/h2.
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25km/h
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If a car accelerated from 5 m/s to 25 m/s in 10 seconds, how far will it travel?
What is the equation? |
150m
d=1/2(Vf+Vi)t |
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What is acceleration due to gravity?
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9.80 m/s2.
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What is the equation for momentum?
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p=mv
momentum = mass times velocity |
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Use bowling to describe the law of conservation of momentum.
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The momentum of the ball is transferred to the pins and lanes.
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Give three factors that oppose motion?
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friction, gravity, wind resistance
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a push or pull upon an object resulting from the object's interaction with another object
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force
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Give 3 examples of contact forces
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Frictional Force
Tension Force Normal Force Air Resistance Force Applied Force Spring Force |
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Give 3 examples of non-contact forces.
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gravitational force
magnetic force electrical force |
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In what unit is force measured?
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Newtons
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1 Newton (N) is equal to what?
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1kg/m/s/s
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affect of an individual force upon an object is canceled by the affect of another force
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balanced force
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an attractive force between all objects
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gravity
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the force exerted by a surface as an object moves across it or makes an effort to move across it
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friction force
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a special type of frictional force which acts upon objects as they travel through the air
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air resistance
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on what type of object would air resistance have the biggest effect?
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large surface area
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the force which is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends
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tension force
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the force of gravity acting upon an object
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weight
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Which one, (Mass or weight) is never altered by location, the pull of gravity, speed or even the existence of other forces
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mass
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Newton's first Law is also known as the law of what?
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inertia
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What does inertia mean?
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objects at rest stay at rest
objects in motion remain in motion in a constant direction unless acted upon by an outside force |
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State Newton's 2nd Law
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force = mass times acceleration
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Determine the accelerations which result when a 12-N net force is applied to a 3-kg object and then to a 6-kg object.
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Use Fnet= m * a with Fnet = 15 N and a = 5 m/s/s.
So (15 N) = (m)*(5 m/s/s) And m = 3.0 kg |
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A net force of 15 N is exerted on an encyclopedia to cause it to accelerate at a rate of 5 m/s2. Determine the mass of the encyclopedia.
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Use Fnet= m * a with Fnet = 15 N and a = 5 m/s/s.
So (15 N) = (m)*(5 m/s/s) And m = 3.0 kg |
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Determine the accelerations which result when a 12-N net force is applied to a 3-kg object and then to a 6-kg object.
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A 3-kg object experiences an acceleration of 4 m/s/s. A 6-kg object experiences an acceleration of 2 m/s/s.
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Suppose that a sled is accelerating at a rate of 2 m/s2. If the net force is tripled and the mass is doubled, then what is the new acceleration of the sled?
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Answer: 3 m/s/s
The original value of 2 m/s/s must be multiplied by 3 (since a and F are directly proportional) and divided by 2 (since a and m are inversely proportional) |
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By wrapping insulated wire around a piece of iron and then running electrical current through the wire, what is created?
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electromagnet
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How can you make an electromagnet stronger?
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more volts or tighter coils
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transmitting light through thin, flexible threads
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fiberoptics
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What are two advantages of fiberoptics?
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more information
faster transmission more precise information smaller |
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Use Newton's Laws of Motion, explain why seatbelts are necessary.
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When you are in a car, your body has the same velocity as the car and will continue to move unless something stops it. It's better to be stopped by the belt than the windshield.
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If there are 2 skaters on the ice, what will happen if they push against one another? Explain.
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both will move opposite of the direction they pushed the other - for every action, there is an equal and opposite reaction
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A truck is traveling 40mph and comes to a quick stop. As the truck decelerates, what happens to a box in the truck bed?
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slides toward the cab of the truck- objects in motion stay in motion in a constant direction unless acted upon by an outside force
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