THE LAWS OF MOTION. Mr. Banks 7 th Grade Science
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1 THE LAWS OF MOTION Mr. Banks 7 th Grade Science
2 MOTION Motion is a change in position over a certain amount of time. When you say that something has moved you are describing motion.
3 SPEED Speed is the rate at which an object moves.
4 SPEED Speed is the rate at which an object moves. You can calculate it using the equation below. Speed = Distance Time
5 SPEED Speed is the rate at which an object moves. You can calculate it using the equation below. Speed = Distance Time This is reflected in how we talk about speed. When you say a car is traveling at seventy miles per hour you mean that if it stays at the same speed, it will move 70 miles every hour.
6 SPEED Speed is the rate at which an object moves. You can calculate it using the equation below. Speed = Distance Time This is reflected in how we talk about speed. When you say a car is traveling at seventy miles per hour you mean that if it stays at the same speed, it will move 70 miles every hour. We express this value as 70 mi/hr = 70 miles 1 hour
7 SPEED Speed is the rate at which an object moves. You can calculate it using the equation below. Speed = Distance Time This is reflected in how we talk about speed. When you say a car is traveling at seventy miles per hour you mean that if it stays at the same speed, it will move 70 miles every hour. We express this value as 70 mi/hr = 70 miles 1 hour
8 SPEED Speed is the rate at which an object moves. You can calculate it using the equation below. Speed = Distance Time This is reflected in how we talk about speed. When you say a car is traveling at seventy miles per hour you mean that if it stays at the same speed, it will move 70 miles every hour. We express this value as 70 mi/hr = 70 miles 1 hour In science we usually use meters for distance and seconds for time.
9 VELOCITY In addition to speed, we need another characteristic to describe motion, direction.
10 VELOCITY In addition to speed, we need another characteristic to describe motion, direction. Velocity is speed in a given direction.
11 VELOCITY In addition to speed, we need another characteristic to describe motion, direction. Velocity is speed in a given direction. So if we want to talk about the velocity of the car from the last slide we would just have to add the direction it was going, lets say it was going south.
12 VELOCITY In addition to speed, we need another characteristic to describe motion, direction. Velocity is speed in a given direction over time. So if we want to talk about the velocity of the car from the last slide we would just have to add the direction it was going, lets say it was going south. So we would write 70 mi/hr South.
13 VELOCITY In addition to speed, we need another characteristic to describe motion, direction. Velocity is speed in a given direction over time. So if we want to talk about the velocity of the car from the last slide we would just have to add the direction it was going, lets say it was going south. So we would write 70 mi/hr South. The equation to find velocity is the same as the one to find speed. Velocity = Distance Time
14 ACCELERATION Acceleration is the rate of change in velocity over time.
15 ACCELERATION Acceleration is the rate of change in velocity over time. If something is accelerating it is speeding up, slowing down, or changing direction.
16 ACCELERATION Acceleration is the rate of change in velocity over time. If something is accelerating it is speeding up, slowing down, or changing direction. The equation for finding acceleration is Acceleration = Final velocity Original velocity Time
17 ACCELERATION Acceleration is the rate of change in velocity over time. If something is accelerating it is speeding up, slowing down, or changing direction. The equation for finding acceleration is Acceleration = Final velocity Original velocity Time So lets say that car was at one point going at 20 mi/hr and sped up to 70 mi/hr over a total of 5 seconds.
18 ACCELERATION Acceleration is the rate of change in velocity over time. If something is accelerating it is speeding up, slowing down, or changing direction. The equation for finding acceleration is Acceleration = Final velocity Original velocity Time So lets say that car was at one point going at 20 mi/hr and sped up to 70 mi/hr over a total of 5 seconds. Acceleration = 70 mi hr 20 mi hr 5 sec
19 ACCELERATION Acceleration is the rate of change in velocity over time. If something is accelerating it is speeding up, slowing down, or changing direction. The equation for finding acceleration is Acceleration = Final velocity Original velocity Time So lets say that car was at one point going at 20 mi/hr and sped up to 70 mi/hr over a total of 5 seconds. Acceleration = 70 mi hr 20 mi hr 5 sec Acceleration = 10 mi/hr/sec
20 TIME FOR SOME PRACTICE
21 LETS SEE HOW YOU DID ON YOUR PRACTICE SHEET
22 How are things moved?
23 FORCE How are things moved? A force is a push or a pull.
24 FORCE How are things moved? A force is a push or a pull. Forces cause objects to start moving, stop moving, change direction, or change shape.
25 FORCE How are things moved? A force is a push or a pull. Forces cause objects to start moving, stop moving, change direction, or change shape. If you want something to move you must exert a force on it.
26 FORCE How are things moved? A force is a push or a pull. Forces cause objects to start moving, stop moving, change direction, or change shape. If you want something to move you must exert a force on it. Force is measured in newtons.
27 FORCE Forces can be combined.
28 FORCE Forces can be combined. When two forces are pushing in the same direction they get added together.
29 FORCE Forces can be combined. When two forces are pushing in opposite directions they get subtracted from one another.
30 COMBINING FORCES
31 COMBINING FORCES
32 COMBINING FORCES
33 COMBINING FORCES
34 GRAVITY Gravity is the force that attracts all objects with mass toward one another.
35 GRAVITY Gravity is the force that attracts all objects with mass toward one another. Gravity is what holds us on the ground because we are attracted to the earth and the earth to us.
36 GRAVITY All objects are attracted to one another, even small ones.
37 GRAVITY All objects are attracted to one another, even small ones. Gravity goes up as the objects get more massive.
38 GRAVITY All objects are attracted to one another, even small ones. Gravity goes up as the objects get more massive. Gravity goes up the closer two objects are to each other.
39 GRAVITY All objects are attracted to one another, even small ones. Gravity goes up as the objects get more massive. Gravity goes up the closer two objects are to each other.
40 FRICTION Friction is a force resisting the motion of an object across a surface, through fluids, or through gasses.
41 FRICTION Friction is a force resisting the motion of an object across a surface, through fluids, or through gasses. Friction pushes against the direction that an object is trying to move.
42 FRICTION Friction is a force resisting the motion of an object across a surface, through fluids, or through gasses. Friction pushes against the direction that an object is trying to move.
43 DRY FRICTION For two solids, friction is caused by little bits of each material catching on each other as they move by.
44 DRY FRICTION For two solids, friction is caused by little bits of each material catching on each other as they move by.
45 FLUID FRICTION Applies to the friction found in the air and water. The molecules in both air and water basically get in the way of something trying to move.
46 NEWTON S LAWS OF MOTION Sir Isaac Newton ( )
47 NEWTON S LAWS OF MOTION Sir Isaac Newton ( ) English physicist and mathematician
48 NEWTON S LAWS OF MOTION Sir Isaac Newton ( ) English physicist and mathematician Discovered the laws of motion
49 NEWTON S LAWS OF MOTION Sir Isaac Newton ( ) English physicist and mathematician Discovered the laws of motion Increased our knowledge of how light works
50 NEWTON S LAWS OF MOTION Sir Isaac Newton ( ) English physicist and mathematician Discovered the laws of motion Increased our knowledge of how light works Created calculus
51 NEWTON S LAWS OF MOTION The first law of motion
52 NEWTON S LAWS OF MOTION The first law of motion An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
53 NEWTON S LAWS OF MOTION Inertia The tendency of objects to remain in motion or to stay at rest.
54 NEWTON S LAWS OF MOTION Inertia The tendency of objects to remain in motion or to stay at rest. Comes from the Latin word for lazy.
55 NEWTON S LAWS OF MOTION Inertia The tendency of objects to remain in motion or to stay at rest. Comes from the Latin word for lazy.
56 NEWTON S LAWS OF MOTION
57 NEWTON S LAWS OF MOTION Mass is the measurement of an object s inertia.
58 NEWTON S LAWS OF MOTION Mass is the measurement of an object s inertia. The scientific unit of mass is the kilogram.
59 NEWTON S LAWS OF MOTION Inertia is increased as the mass of an object is increased.
60 NEWTON S LAWS OF MOTION Inertia is increased as the mass of an object is increased.
61 NEWTON S LAWS OF MOTION Question: If something is being rolled on the ground, and doesn t bump into anything, why does it stop and not keep going on forever?
62 NEWTON S LAWS OF MOTION Question: If something is being rolled on the ground, and doesn t bump into anything, why does it stop and not keep going on forever? Answer: Friction!
63 NEWTON S LAWS OF MOTION The second law of motion
64 NEWTON S LAWS OF MOTION The second law of motion Newton s second law of motion shows how force, mass, and acceleration are related in the form of an equation.
65 NEWTON S LAWS OF MOTION The second law of motion Newton s second law of motion shows how force, mass, and acceleration are related in the form of an equation. Force = mass X acceleration
66 NEWTON S LAWS OF MOTION The second law of motion Force = mass X acceleration
67 NEWTON S LAWS OF MOTION The second law of motion Force = mass X acceleration As mass goes up, you need more force to accelerate it at the same rate.
68 NEWTON S LAWS OF MOTION The second law of motion Force = mass X acceleration As mass goes up, you need more force to accelerate it at the same rate.
69 NEWTON S LAWS OF MOTION The second law of motion Force = mass X acceleration If you want to accelerate faster, you need more force to accelerate the same weight.
70 NEWTON S LAWS OF MOTION The second law of motion Force = mass X acceleration If you want to accelerate faster, you need more force to accelerate the same weight.
71 NEWTON S LAWS OF MOTION The second law of motion Force = mass X acceleration If you want to accelerate faster, you need more force to accelerate the same weight.
72 NEWTON S LAWS OF MOTION The third law of motion For every force, there is an equal and opposite force.
73 NEWTON S LAWS OF MOTION The third law of motion For every force, there is an equal and opposite force. All forces come in pairs.
74 NEWTON S LAWS OF MOTION The third law of motion For every force, there is an equal and opposite force. All forces come in pairs. The more force that is exerted on an object, the more force is returned.
75 NEWTON S LAWS OF MOTION The third law of motion For every force (action), there is an equal and opposite force (reaction).
76 NEWTON S LAWS OF MOTION The third law of motion For every action, there is an equal and opposite force.
77 NEWTON S LAWS OF MOTION The third law of motion For every action, there is an equal and opposite reaction.
78 NEWTON S LAWS OF MOTION The third law of motion For every action, there is an equal and opposite reaction.
79 NEWTON S LAWS OF MOTION The third law of motion For every action, there is an equal and opposite reaction.
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