Forces & Motion - Gravity & Motion
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| the path of one object around another in space | orbit
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| an unbalanced force that causes objects to move in a circular path | centripetal force
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| the motion of a body when only gravity acts on it | free fall
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| the curved path of a thrown object near Earth's surface | projectile motion
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| the constant velocity of a falling object when the force of gravity is balanced by air resistance | terminal velocity
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| the force that opposes the motion of objects through the air | air resistance
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| If a baseball and a cannonball are dropped from the same height at the same time, which ball will hit the ground first? | The balls land at the same time.
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| What feature does NOT affect air resistance? | its chemical properties
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| If a baseball and a cannonball are dropped from the same height at the same time, which will hit the ground first? | The balls land at the same time.
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| Why do astronauts in space appear weightless? | They are in free fall.
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| In what direction is a projectile accelerated? | vertically downward
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| Is the reaction force of a chair you are sitting on equal to your weight. | Yes
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| What is a common unbalanced force acting on objects in motion? | friction
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| When a train increases its velocity, does its momentum increase or decrease? | increases
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| A car with a mass of 1,400 kg moves along the ice with a constant velocity of 18.0 m/s. What is the car's momentum? | 25,200 kg m/s
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| When a bowling ball collides with a bowling pin, does the momentum increase or decrease? | decreases slightly
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| If a moving boxcar gently collides with a boxcar at rest and the boxcars move together, what will their combined momentum be? | equal to the original momentum of the moving boxcar
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| The law of conservation of momentum states that when two objects collide, what happens to their combined momentum? | remains the same after the collision
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| If an action force is a cue ball hitting a billiard ball, then the reaction force is exerted on which billiard ball? | By the billiard ball on the cue ball
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| How does the velocity of a falling object change over time? | the object falls faster and farther each second than it did the second before
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| What is the rate at which objects fall toward Earth? | 9.8 m/s2
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| What is the symbol for change in velocity? | Δv
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| What is the symbol for time the object takes to fall? | t
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| What is the symbol for acceleration due to gravity? | g
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| Why would a flat piece of paper take longer to fall than a crumpled piece of paper? | air resistance
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| When does a falling object stop accelerating? | at terminal velocity
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| What is the only force on an object in free fall? | gravity
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| Where is the path of an orbiting spacecraft? | curved path following curve of Earth
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| Where is the path of spacecraft in freefall due to gravity? | straight down toward Earth
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| Where is the path of the spacecraft without gravity? | straight line forward
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| How many directions make up projectile motion? | two
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| What is vertical motion? | motion that is perpendicular to the ground
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Created by:
masonteach
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