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Chapter 3 Review
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Vocabulary When the upward and downward forces on a falling object are equal, the object reaches _____________. Terminal Velocity
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Vocabulary The force that holds the particle sin the nucleus together is the __________. Strong Nuclear Force
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Vocabulary The SI unit for force is _______. Newton (N)
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Vocabulary A push or pull that starts or stops the motion of an object or changes its direction is called a(n) __________. Force
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Vocabulary Gravitation, electromagnetic, and strong and weak nuclear forces are _________. Universal Forces
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Vocabulary When you body is at rest, you have __________. Inertia
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Vocabulary The force that opposes motion is __________. Friction
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What Doesn’t Belong? Universal Force, Electromagnetic Force, Gravitational Force. Universal Force- this is the general term that includes electromagnetic and gravitational forces.
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What Doesn’t Belong? Sliding, Rolling, Momentum Momentum- Sliding and rolling are types of friction; momentum is a property of a moving object.
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What Doesn’t Belong? Electrical, Magnetic, Centripetal Centripetal Force- Electric and magnetic are forces between objects; centripetal force is the force required to make an object move in a circle.
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What Doesn’t Belong? Terminal Velocity, Constant Acceleration, Friction Constant Acceleration- Terminal velocity is reached because of friction between the object and the air.
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What Doesn’t Belong? Weak Force, Strong Force, Sliding Force Sliding Force- the sliding force is not one of the universal forces.
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Check Your Knowledge What causes a ball to follow a curved path when you throw it? A thrown ball follows a curved path because of the force of gravity on the ball.
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Check Your Knowledge What is terminal velocity? Velocity at which the force of gravity pulling down on a falling object is exactly balanced by the force of air resistance pushing upward, resulting in that object falling at a constant velocity.
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Check Your Knowledge How is gravity related to the weight of an object? The weight of an object is a result of the force of gravity on the object.
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Check Your Knowledge List three different kinds of force you use when you ride your bike. Force of your muscles on the pedals and handlebars; force of your weight on the seat; force of friction from the pavement pushing on the tires; force of gravity on the bike.
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Check Your Knowledge Calculate the acceleration of a 70-kg mass on a swing if you push it with a 40-N force. a=F/m; a= 40N/70kg; a= 0.57m/s 2.
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Check Your Knowledge How does the force of gravity form the moon affect the Earth? The force of gravity from the moon causes tides on Earth.
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Check Your Knowledge What is centripetal force? Centripetal force- a force that causes an object to move in a circular path.
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True or False? The force that holds the nucleus together is the strong nuclear force? True
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True or False? Momentum can transfer from one object to another object. True
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True or False? The acceleration of the Earth’s gravity is 9.8m/s 2. True
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True or False? According to Newton’s second law, acceleration decreases as mass increases. True
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True or False? According to the second law of motion, force is equal to mass times speed. False; acceleration
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True of False? The electric force and the magnetic force are both a result of charge particles. True
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True or False? Newton’s third law of motion could be called the law of inertia. False; first
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Check Your Understanding An object’s velocity times its mass is _______. Momentum
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Check Your Understanding What are the three types of friction and when do they occur? Fluid friction- when moving through air or liquid. Rolling friction- friction that occurs between a rolling object and another surface. Sliding friction- friction that occurs between two objects that are sliding past one another.
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Check Your Understanding Rank the strength of the universal forces from weakest to strongest. 1. Gravitational 2. Weak Nuclear 3. Electromagnetic 4. Strong Nuclear
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Check Your Understanding Which kinds of forces attract? Which kind repel? Like forces repel and opposite forces attract.
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Check Your Understanding What do nuclear forces act on? What makes one weak and the other strong? Nuclear forces act on the nucleus of atoms (protons and neutrons). Strong nuclear forces keep the nucleus together; Weak Nuclear forces cause nuclear decay.
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Check Your Understanding Which object will accelerate faster when the same amount of force is applied to them, a cart that weighs 20kg or a cart that weighs 40 kg? The 20kg cart.
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Check Your Understanding Is the force needed to overcome sliding friction greater than or less than the force needed to overcome rolling friction? Greater than
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Check Your Understanding If you were to travel to a planet that has less gravity than earth, would you weigh: the same as, less than, or greater than you do on earth? Less than
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