Motion and Gravity
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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| True or False - Without air resistance, the objects will fall at different speeds and hit the ground at different times. | False; they fall at a same speed and hit the ground at the same time.
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| What is a differenc between mass and weight? | The mass is the amount of matter in an object and the weight is the amount of force is acting on an object.
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| If the cable breaks on the elevator, you will be in _________. | Free-fall
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| If the elevator goes up, you become _________. | Heavier.
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| If the elevator goes down, you become _________. | Lighter
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| Momentum = | Mass * Velocity
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| What is net force? | The overall force to which an object responds to: change in momentum (mass * acceleration)
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| When does the change of momentum occurs? | When the net force is not zero.
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| Are there any net force acting on the car when it comes to a stop? | Yes
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| Are there any net force acting upon an elevator when it is going up at a constant speed? | No.
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| Are there any net force acting upon the moon when it orbits around Jupiter? | Yes
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| Are there any net force acting upon the bus when it speeds up? | Yes
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| Are there any net force acting upon the bicycle when it moves around in circles? | Yes
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| How are people in spaceships weightless in space? | The spaceships travel so fast that they can orbit around the Earth without falling into it.
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| In space, weightlessness is due to? | Constant state of free-fall.
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| What is angular momentum? | Any object either moving along a curved path or spinning.
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| How does the Earth have angular momentum? | It rotates (rotational angular momentum) and orbits around the Sun (orbital angular momentum).
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| What do the light and gravity follow? | Inverse square law
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| What does inverse square law explain? | The intensity decrease at distance squared (1/distance squared)
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| What are examples of weightlessness? | -A person is falling off a chair -A person jumps on a trampoline -Astronuats float in space.
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| What is Newton's first law of motion? | -An object moves in a same velocity unless a net force acts upon it.
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| What is Newton's second law of motion? | -Force = mass * acceleration (change in momentum)
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| Suppose you swing a ball with a string in circles and the string suddenly breaks, what happen to the ball? | The ball goes directly away from you in a straight line.
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| What is Newton's third law of motion? | Any force has its opposite and equal reaction force.
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| What is an example for Newton's first law of motion? | A spaceship moves across space without fuel.
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| What is an example for Newton's second law of motion? | A person tries to move a bowling ball, but it doesn't move that much.
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| What is an example for Newton's third law of motion? | A Space Shuttle liftoffs from space; it proppelled upward by an equal force but opposite to the gas expelled from the back.
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| What is acceleration? | Change in velocity
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| What is speed? | Change in distance over time
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| What is velocity? | Speed and direction
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To hide a column, click on the column name.
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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