Term
| Which component, horizontal or vertical, of an object's velocity remains constant as a projectile travels? |
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Definition
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Term
| If the action force is the earth pulling on a feather, what is the reaction force? |
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Definition
| the feather pulling on the earth |
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Term
If a cliff diver carried a speedometer on his dive, by how much would the reading increase each second? |
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Definition
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Term
| If a car moves 29 meters in one second, 29 meters in the second second, and 29 meters in the third second of travel, what is its acceleration? |
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Definition
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Term
| When you look at the speedometer in a car the number reflects the ______________ velocity of the car. (instantaneous or average) |
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Definition
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Term
| Why doesn't the horizontal component of velocity change during the flight of a projectile? |
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Definition
| because there are no forces acting in the horizontal direction |
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Term
| If a crumpled piece of paper and a flat sheet of paper fall which will hit the ground first? |
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Definition
| the crumpled piece because it is affected less by air resistance |
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Term
If the upward direction is positive, during the flight of a projectile, the acceleration on the object is: positive negative positive then negative negative then positive |
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Definition
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Term
| If you increase the velocity of an object, which of the following quantities increases: momentum, kinetic energy, force |
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Definition
| momentum and kinetic energy |
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Term
| A ball hits a bat. Compared to the force of the bat on the ball, the force of the ball on the bat is ____________. |
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Definition
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Term
| Gravitational potential energy depends on what three things? |
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Definition
| mass of the object, the acceleration due to gravity and the object's height above the ground |
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Term
| Elastic potential energy depends on the spring constant (stiffness of the spring) and ______________. |
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Definition
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Term
| In the absence of air resistance, which will hit the ground first: an egg or feather? |
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Definition
| they will hit at the same time |
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Term
| The rate at which work is done |
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Definition
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Term
The quantity of work done divided by the time it takes to do the work |
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Definition
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Term
| If at the same instant a bullet is dropped and another is shot perfectly straight forward at the same height, which will hit the ground first? |
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Definition
| they will hit at the same time |
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Term
| ________ causes acceleration. |
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Definition
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Term
| If an object is moving in a circle is it accelerating? |
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Definition
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Term
| Can an object accelerate without changing speed? |
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Definition
| yes, by changing direction |
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Term
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Definition
| For every action force, there is an equal and opposite reaction force |
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Term
| Which of Newton's Laws is behind the trick of pulling the table cloth out from under a place setting and having the place setting remain in the same position? |
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Definition
| Newton's First Law (objects at rest remain at rest unless acted on by a force) |
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Term
A ball is falling, each second it falls it covers ____________ distance. more the same less |
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Definition
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Term
| If you double the distance you push an object but apply the same amount of force, how does the work change? |
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Definition
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Term
| Newton's first law can be stated in one word: ___________. |
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Definition
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Term
| At the top of a projectile's path, its acceleration is ____________. |
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Definition
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Term
If the acceleration of an object with constant mass doubles, what else has doubled? |
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Definition
| the force acting on the mass |
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Term
| Gravity acts in which direction? |
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Definition
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Term
| What type of friction could be referred to as moving friction? |
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Definition
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Term
Inertia is directly related to what property of an object? |
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Definition
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Term
| What type of friction is non-moving friction? |
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Definition
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Term
| Traveling to another planet, which measurement changes mass or weight? |
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Definition
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Term
| What unit is used to measure mass? |
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Definition
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Term
The product of force and distance |
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Definition
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Term
| State the law of conservation of energy |
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Definition
| Energy cannot be created or destroyed |
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Term
What really happens when energy is "lost"? |
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Definition
| It is transformed into another kind or transferred to another object |
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Term
| If a runner increases his speed from 0 m/s to 3 m/s in the first second and 3 m/s to 6 m/s in the second second, what is his acceleration? |
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Definition
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Term
| What quantities use joule as the unit? |
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Definition
| kinetic energy, potential energy, work |
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Term
| If you are on rollerskates moving in a positive direction and begin to slow down, your acceleration is in which direction? |
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Definition
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Term
| A quantity with magnitude and direction |
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Definition
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Term
| What direction does friction act in? |
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Definition
| the direction opposite motion |
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Term
| How is the force of friction oriented relative to the surface of contact? |
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Definition
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Term
| The normal force is ____________ to the surface of contact |
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Definition
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Term
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Definition
| bumps on the two surfaces in contact |
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Term
| Describe the energy change in a roller coaster as it moves up a hill. |
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Definition
| the energy changes from kinetic to potential |
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Term
| Where does a projectile have minimum speed? |
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Definition
| at the top of its path (vertical velocity is zero) |
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Term
| In the absence of friction, if a roller coaster is going 30 m/s before it crests a hill, how fast should it be going when it reaches the same position (height) on the way down the hill? |
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Definition
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Term
A book is on a table, the force pushing back on the book is the _____________ force. |
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Definition
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Term
| The product of 1/2 the mass of an object times the velocity squared |
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Definition
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Term
| Force and acceleration are _______________ related. (directly, inversely) |
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Definition
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Term
| Watts are the unit for _________. |
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Definition
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Term
| Mass and acceleration are ___________ related. (directly, inversely) |
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Definition
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Term
| If you do 10 J of work to lift an object, how much potential energy does it have? |
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Definition
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Term
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Definition
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Term
If you are walking forward and toss a ball in the air, where will it land? behind you in front of you in your hand |
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Definition
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