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Motion and Forces #1
Speed, velocity, acceleration
| Question | Answer |
|---|---|
| If the force acting upon an object increases, what happens to the object's acceleration? | The acceleration will also increase. |
| How does the mass of an object affect its acceleration? | If the force is constant, the greater the mass, the less the acceleration. |
| What force keeps an object moving in a circle? | Centripetal force |
| In what direction does centripetal force act? | Toward the center of the circle |
| What force is needed to accelerate an object 5 m/s/s if the object has a mass of 10 kg? | A force of 50 newtons is needed. |
| A girl pulls a wheeled backpack with a force of 3 N. If the backpack has a mass of 6 kg, what is its acceleration? | .5 m/s/s |
| A boy pushes a shopping cart with a force of 10 N, and the cart accelerates 1 m/s/s. What is the mass of the cart? | 10 kg |
| Explain the difference between balanced and unbalanced forces. | Balanced forces do not change an object's motion; unbalanced forces do change an object's motion. |
| What is inertia? | Inertia is an object's resistance to a change in it's motion. |
| How is the inertia of an object related to its mass? | Inertia is equal to the mass of an object. |
| State Newton's First Law of Motion. | An object at rest will remain at rest, and an object in motion will remain in motion with the same velocity, unless acted upon by an unbalanced force. |
| State Newton's Second Law of Motion. | The acceleration of an object increases with increased force, and decreases with increased mass. |
| State Newton's Third Law of Motion. | For every action there is an equal but opposite reaction. |
| What is the definition of force? | A push or a pull |
| What is net force? | The overall force acting on an object when all the forces are combined. |
| What is position? | The location of an object or place |
| What is a reference point? | A location to which you compare other locations |
| What is motion? | The change in position over time |
| What is speed? | A measure of how fast something moves or the distance it moves, in a given amount of time |
| How is speed calculated? | Speed = distance/time |
| If you travel 100 m in 50 s, what is your speed? | 2m/s |
| What is velocity? | Speed in a specific direction |
| What is a vector? | A quantity that has both size and direction |
| Give 2 examples of a vector. | velocity, acceleration, force |
| What is acceleration? | The rate at which velocity changes with time |
| Name 3 ways that an object can accelerate. | speeding up, slowing down, or changing direction |
| How is acceleration calculated? | Acceleration = final velocity - initial velocity / time |
| What is the standard unit for acceleration? | meter per square second |
| What is the standard unit of mass in the metric system? | the kilogram |
| How is weight different than mass? | Weight depends on location. Mass is constant. |
| If you weighed 60 pounds on Earth, what would you weigh on the moon? | 10 pounds |
| What is the correct order of the technological design process? | Identify the challenge, propose designs, choose a design, build it, test the product, evaluate it |
| What is the standard unit of weight in the metric system? | The newton |
Created by:
robertalafontaine
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