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CH 12 TEST
Physical Science
| Question | Answer |
|---|---|
| Which is not a force? | momentum |
| You push on a box and are unable to move it. What force opposes your push? | static friction |
| Air resistance depends on | the velocity of a moving object |
| What force besides gravity acts on a projectile? | air resistance |
| Newton's first law of motion is sometimes called the law of | inertia |
| For every action force there is a | reaction force |
| Momentum depends upon | mass and velocity |
| What force holds the nucleus together? | strong nuclear |
| What happens to an object when an unbalanced force acts on it? | it accelerates |
| What must you know to determine which of 2 vehicles traveling at the same velocity, has the greater momentum | the mass of each vehicle |
| Mass is measured in | kilograms |
| Acceleration is measured in | meters per second squared |
| Force is measured in | Newton |
| Electric and Magnetic forces are the only ones that can both ______________ and _________________ | attract repel |
| Nuclear forces holds _________________ together | atoms |
| Gravitational force is the ___________________ universal force | weakest |
| Gravitational force acts over very ______________ distances | long |
| The larger the mass of an object the _________________ its gravitational force | greater |
| Gravitation is a centripetal force, which means | a force that continually changes the direction of an object so it moves in a circle |
| Examples of gravitational force | moon orbiting the Earth, satellites orbiting planets, car making a turn |
| Four types of friction from strongest to weakest | static, sliding, rolling, fluid |
| Static is the friction force that acts on | an object that is not moving (at rest) |
| Sliding friction is the friction | opposing an object that is moving over a surface |
| Rolling friction is the friction acting on | rolling objects |
| Fluid friction is the friction that | opposes an object that is moving through a fluid |
| Force that opposes motion between any surfaces that are in contact | friction |
| What are 2 ways the acceleration of an object can be increased? | increase force decrease mass |
| Example of conservation of momentum | bumper cars |
| If I am leaning against a wall, what forces are acting? | me against the wall, static gravity my feet against the floor, gravity air pressure pushing my body, and my body pushing back |
| Why is harder to run on a swimming pool? | due to fluid friction. The faster a moving object is, the greater is the fluid friction resisting its motion. |
| If a Great Dane and a Chihuahua jump off the couch at the same time, who land first | both will land at the same time due to the gravity that pulls them equally toward the Earth |
| If a Great Dane and a Chihuahua are running at the same speed, which has the greater momentum? | The Great Dane because it has greater mass |
| If a person jump of an airplane without a chute, will the person will keep building up speed until it hits the ground? | no, because at some point the air resistance pushing him up will equal the gravity pulling him down (terminal velocity) |
| A force can act to cause abject at rest to _____________ or it can _________________ an object that is already moving | move accelerate |
| If the net force is zero, does an object move? | no |
| Walking is an example of | static friction |
| Pushing a book on the desk is an example of | sliding friction |
| Pulling a suitcase with rolling wheels is an example of | rolling friction |
| _______________ causes an object to accelerate downward, whereas _________________ acts opposite to the direction of motion to reduce acceleration | gravity air resistance |
| Acceleration of an object depends upon the ___________ of the object and the ________ acting on it | mass net force |
| Causes an object's velocity to change | net force |
| The equal and opposite forces described by Newton's third law are called ____________ and __________ | forces |
Created by:
anvalencia