Physical Science Chapter 12 – Flashcards
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The SI unit of force is the
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Newton
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Which of the following relationships is correct
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1 N=1 KG. m/s2
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When an unbalanced force acts on an object
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The object accelerates
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When a pair of unbalanced forces acts on an object, the net force that results is
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Equal to zero
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What kind of friction occurs as a fish swims through water
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Fluid
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As you push a cereal box across a table top, the sliding friction acting on the cereal box
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Acts in the direction opposite of motion
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The forces acting on a falling leaf are
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Gravity and air resistance
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An open parachute increases air resistance of a falling sky diver by
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Increasing surface area
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Projectile motion is caused by
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The downward force of gravity and an initial forward velocity
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The property of matter that resists changes in motion is called
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Inertia
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An orange might roll off of your cafeteria tray when you stop suddenly because of
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The orange's inertia
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According to Newton's second law of motion the acceleration of an object equals the net force acting on the object divided by the object's
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Mass
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Your weight equals your
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Mass times the acceleration due to gravity
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The acceleration due to gravity on the surface of Mars is about one third the acceleration due to gravity on Earth's surface. The weight of a space probe on the surface of Mars is about
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One third its weight on Earth's surface
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Newton's third law of motion describes
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Action and reaction forces
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In which of the following are action and reaction forces involved
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All of the above
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The product of an objects mass and velocity is its
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Momentum
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What is conserved when two objects collide in a closed system
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Momentum
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What force is responsible for the repulsion between two positively-charged particles
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Electric
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When opposite poles of two magnets are brought together, the poles
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Attract each other
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Which universal force acts only on the protons and neutrons in a nucleus
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Strong nuclear
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With which of the following is the weak nuclear force associated
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Nuclear decay
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Which of the following universal forces is the weakest
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Gravitational
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As an astronaut travels far away from Earth, her weight
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Decreases because gravity decreases
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The gravitational force between two objects increases as mass
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Increases or distance decreases
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The force that keeps an object moving in a circle is called
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Centripetal force
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The centripetal force acting on a satellite in orbit
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All of the above
