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Josh Physics Science
| Question | Answer |
|---|---|
| What is a force? | A push or pull that acts on an object to change its motion |
| The units for force are? | Newtons (Abbreviation: N) |
| _______ are used to represent force. The _______ of the arrows shows it’s _______ | Arrows, direction, strength |
| What is Net Force? | The overall force acting on an object after all forces are combined. |
| What do forces moving in the same direction do ? (Add or Subtract) | Add |
| What do forces moving in opposite directions do? (Add or Subtract) | Subtract |
| What are balanced forces? | Forces that combine to produce a net force of 0 |
| What are unbalanced forces? | Forces that result in a net force of non-zero |
| What is friction? | A force that works against the motion of objects that touch as they move past each other |
| How many main types of friction are there? | 4 |
| What type of friction acts on objects that are at rest and always acts in the opposite direction of applied force | Static Friction |
| What type of friction opposes the direction of an objects motion as it slides over a surface | Sliding Friction |
| What type of friction acts on objects that are circular | Rolling Friction |
| What type of friction opposes the motion of an object through a fluid, uses air resistance and increase resistance as the speed of the object moving through the fluid increases. | Fluid Friction |
| Gravity acts _______ towards earth. A. Downward B. Upward C. Erratically | A. Downward |
| Gravity causes object to ______ A. Explode in millions of pieces B. Accelerate downward C. Float at a steady speed downward | B. Accelerate Downward |
| True or False Air resistance acts in the opposite direction of gravity and reduces acceleration. | True! |
| What is Gravity? | A force that acts between any two objects with masses (that means that EVERYTHING has a gravitational pull… usually not a very strong one) |
| True or false Gravity and friction affect the motion of a falling object. | False! Gravity and acceleration affect the motion of a falling object. |
| What is the word for the constant velocity of a falling object when the force of air resistance equals the gravity | Terminal Velocity |
| What is projectile motion? | When an object follows a curved path after given an initial forward velocity. |
| What is Newton’s first law of motion? | An object in motion will stay in motion and an object at rest will stay at rest, unless an unbalanced force acts upon it. |
| What is Inertia? | The tendency of an object to resist a change in motion |
| What does the second law of motion state? | That force = Mass x Acceleration |
| The acceleration of an object is always in the _____ direction as the net force | Same |
| What is the third law of motion? | For action there is an equal and opposite reaction |
| What is the measure of the amount of material an object contains | Mass |
| What is a measure of the force of gravity acting on an object? | Weight |
| Mass x 9.8 m/s squared results in what? | Weight |
| What is the formula for Momentum | Mass x Velocity |
| An object with a ______ momentum is ________ to stop than an object with small momentum | Larger, harder |
| What is gravitational force? | An attractive force that acts between any two masses. |
| As distance decreases, gravitational force _____ | Also decreases |
| As mass decrease, gravitational force_______ | Also decreases |
| What is a center-directed force that continuously changes the direction of an object to make it move in a circle | Centripetal Force |
| What is an electrical force? | A force that is either natural or man made( like static) |
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