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45 Cards in this Set
- Front
- Back
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Newton's first law of motion (inertia) |
states that an object at rest remains at rest and an object in motion remains in motion until acted upon by an unbalanced force. In other words, unbalanced forces are needed to change an object’s motion.
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Newton's second law of motion |
states that the amount of acceleration depends on both force and mass. From the 1st law, we know that an object cannot move unless a force is applied to that object. In the 2nd law, we can answer questions such as, “How much force is needed to move a 2000 kg truck from 0 to 60 mph?”
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what are the 4 main ideas of the second law of motion |
1.Acceleration is a result of unbalanced forces.2.The greater the force, the greater the acceleration.
3. Acceleration is inversely proportional to mass (As the mass increases, the acceleration decreases. Heavier objects are harder to move). 4. The acceleration is always in the same direction as the force. |
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Newton's third law of motion |
explains the interaction that occurs between two objects. The law states that for every action that occurs, there is an opposite and equal reaction.
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if a rocket is launched into space, and the force of the gas explodes out from the back of the rocket as the rocket accelerates in the opposite direction what law is it? |
3rd law |
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if a lamp sits on a table and does not move what law is it? |
1st law |
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it is easier hitting a beach ball over a net than hitting a volleyball over a net what law is it? |
2nd law |
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when you paddle in a canoe, the canoe goes in the opposite direction what law is it |
3rd law |
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a girl who was pulling her little brother in his red wagon is crying because when she stopped to tie her shoe, the wagon kept moving and hit her legs what law is it |
1st law |
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a pitched baseball goes faster that one that is gently thrown what law is it |
2nd law |
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a student leaves a book on a desk. the book stays in the same place until another student picks it up what law is it |
1st law |
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a frog leaped upward off a lily pad is pulled downward by gravity and lands on another lily pad instead of continuing in a strait line what law is it |
1st law |
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after you start up your motorcycle, as you give it more gas, it goes faster what law is it |
2nd law |
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Steven and his dad are skipping rocks on a pond. the rocks that Steven's dad throws go farther than his what law is it |
2nd law |
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how do u find force |
F=ma |
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how does an unbalanced force cause motion |
A force can give energy to an object causing the object to start moving, stop moving, or change its motion. Forces occur in pairs and can be either balanced or unbalanced. Balanced forces do not cause a change in motion. They are equal in size and opposite in direction.
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newton's 3rd law example |
The object with more mass has more inertia and will have a greater effect on the smaller object. A good example of this effect might be two football players with unequal masses colliding with each other. The larger, more massive player has more inertia and would effect a greater change on the smaller player. The forces are equal but the effect is different.
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the law of action- reaction |
The law of action-reaction (Newton's third law) explains the nature of the forces between the two interacting objects. According to the law, the force exerted by object 1 upon object 2 is equal in magnitude and opposite in direction to the force exerted by object 2 upon object 1.
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define speed |
Speed is defined as the rate of change in distance with respect to time. Since speed is derived from distance, a scalar quantity, then speed is also a scalar quantity. |
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define velocity |
Velocity is the rate of change in displacement with respect to time. Since displacement is a vector quantity, velocity is then a vector quantity. |
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what is the difference between speed and velocity |
speed is the rate of change in distance with respect to time and velocity is the rate of change in displacement |
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define scalar |
Scalar means that the value has no directional information attached to it. All objects have speed; if they are not moving, they have a speed of zero.
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define vector |
Vector is a quantity that has both direction and magnitude.
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how do you find speed |
s = d/T.
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how do u find distance |
D=S times time
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how do u find time |
T=D/S
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what happens when an unbalanced force is applied |
` As an unbalanced force is applied, the speed and/or direction of the object is changed. This change is called acceleration. When working with a change in speed, you will use the equationa = (Vf – Vi)/T
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what is work |
Work is a measure of the force required to move a mass a certain distance. It is calculated by multiplying force (N) x distance (m). The formula for work is: W = F x d and is measured in Joules (J).
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what is a joule |
A joule is the amount of work done on an object by a one Newton force that moves the object a distance of one meter
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Explain why a baseball thrown in outer space behaves differently than a baseball thrown on Earth.
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A baseball would keep going in the direction it was thrown and never stop, rather than falland slow down because there is no gravity or air resistance in space to change the ball‛sspeed and direction.
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If you jump from a boat to the the dock, the boat will push away from the the dock. UseNewton‛s Laws to explain why this happens.
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According to Newton‛s 1st law, the boat moved because you were the outside force moving it.According to Newton‛s 2nd Law, your force moved it at a certain speed and for a certaindistance. According to Newton‛s 3rd Law, the boat moved in the opposite direction (reaction)that you did because that was the direction of your force (action).
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What is the speed of a bus that travel 90 km in 2.25 hours?
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40 km/hr
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Lindsay runs 5 meters per second. How far will she run in one minute?
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300 meters
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If a superhero is flying at 50 km/h, how far would she travel in 30 minutes?
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25 km
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If an airplane travels at an average speed of 610 km/h and the trip takes 2.75 hours, what is theflight distance between St. Louis and Boston?
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1677.5 km |
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A car moving at 4.5 m/s accelerates to a speed of 22m/s in 7 seconds. What is the car‛s rate ofacceleration? |
2.5 m/s2 |
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After a stop in Anchorage, the train pulls away from the station and accelerates to 48m/s in 120seconds. What is the train‛s rate of acceleration? |
0.4 m/s2 |
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Mike used 20 joules of work to push a 2 Newton hockey puck across the frozen pond. How manymeters did the hockey puck travel? |
10 m |
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A toy truck has a mass of 1kg. Daniel pushes the truck across the carpet with a force of 4Newtons. Calculate the acceleration of the car. |
4 m/s2 |
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Eric has a battery operated toy train consisting of 5 train cars. Each car has a mass of15 grams except for the 1st car which has a mass of 30 grams. Find the force needed toaccelerate the train at 3.0m/s2 |
0.27 N (Remember that you must use kg when calculating Force! 90 g = 0.09 kg) |
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Laurie is pulling a sled up a hill. She has exerted a force of 15 Newtons over a distanceof 100 meters. Calculate the amount of work Laurie has done |
1500 J |
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Patricia is walking at a speed of 3km/hr. She turns to the left but continues at a speed of3km/hr. Describe any changes in her speed, velocity, and acceleration as she walked. |
Her speed did not change. Both acceleration and velocity changed because she changed herdirection. |
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all 3 vehicles aremoving at 45km/h. Only the pickup truck has achanging velocity. Describe why the pickup truck‛svelocity is changing but the minivan and sedan arenot changing velocity. |
The truck is changing directions, which is partof velocity. |
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An unbalanced force causes an object to |
accelerate or change velocity |
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how do u calculate the work |
W=F times D |
