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Friction and Gravity
Review of friction and gravity
| Question | Answer |
|---|---|
| The force that two surfaces exert on each other when they rub against each other. | Friction |
| The strength of the force of friction depends on these two factors. | How hard the surfaces push together and the types of surfaces involved. |
| The friction that acts on objects that are not moving. | Static Friction |
| The friction that occurs when two solid surfaces slide over each other. | Sliding Friction |
| The friction that occurs when an object rolls across a surface. | Rolling Friction |
| The friction that occurs when a solid object moves through a fluid. | Fluid Friction |
| A force that pulls all objects towards each other. | Gravity |
| This states that the force of gravity acts between all objects in the universe. | The Law of Universal Gravitation |
| These two factors affect the gravitational attraction between objects. | Mass and Distance |
| Force is measured in this unit. | Newtons |
| The force of gravity on a person or object at the surface of a planet. | Weight |
| In __________________________, the force of gravity is an unbalanced force, which causes an object to accelerate. | Free Fall |
| The motion of a falling object when the only force acting on it is gravity. | Free Fall |
| The fluid friction objects experience as they fall through the air. | Air Resistance |
| The greatest velocity a falling object can reach. | Terminal Velocity |
| Friction acts in a direction ___________________ to motion. | Opposite |
| If mass increases, gravity ___________________. | Increases |
| If mass decreases, gravity ___________________. | Decreases |
| If distance increases, gravity _____________. | Decreases |
| If distance decreases, gravity _____________. | Increases |
| A measure of the amount of matter in an object. | Mass |
| ___________ is a measure of the amount of matter in an object; ________________ is a measure of the gravitational force exerted on an object. | Mass, Weight |
| ____________________ varies with the strength of the gravitational force but _____________ does not. | Weight, Mass |
| Eventually, a falling object will fall fast enough that the upward force of air resistance becomes equal to the downward force of gravity acting up on the object. At this point the forces on the object are _____________________. | Balanced |
| What two forces are acting on a sky diver that just jumped out of a plane? | Gravity and Air Resistance (Fluid Friction) |
| How would your weight change on the surface of a planet whose mass was greater than Earth's? | You would weigh more |
| How would your mass change on the surface of a planet whose mass was less than Earth's? | Your mass wouldn't change |
| How would your weight change on the surface of a planet whose mass was less than Earth's? | Your weight would decrease |
| How would your mass change on the surface of a planet whose mass was greater than Earth's? | Your mass wouldn't change |
Created by:
larissa1003
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