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motion and forces 🌷
QUESTIONS- mfe: chapter 2- motion, forces, and energy
| Question | Answer |
|---|---|
| In science, a force is _____ | a push or pull |
| When one object pushes or pulls another object, the first object is _________ a force on the second object | exerts |
| The SI unit to measure the strength of a force is the _______ | newton |
| The overall force on an object after all the forces are added together is called the __________ | net force |
| When two forces act in the same direction, they are ______ together | added |
| What three things to unbalanced forces cause an object to do? | start moving, stop moving, or change direction |
| T or F: Unbalanced forces acting on an object will change the object's motion | true |
| Equal forces acting on one object in opposite directions are called | balanced forces |
| T or F: Balanced forces acting on an object will change the object's motion | false |
| When you add equal forces exerted in opposite directions, the net force is ________ | zero |
| T or F: When two surfaces rub, the irregularities of one surface get caught on those of the other surface | true |
| What is the force that two surfaces exert on each other when they rub against each other? | friction |
| Friction acts in a direction ________ to the object's direction of motion. | opposite |
| The strength of the force of friction depends on what two factors? | how hard the surfaces push together and the types of surfaces involved |
| What kind of friction occurs when an object moves through a liquid or gas? | fluid |
| What kind of friction occurs when solid surfaces slide over each other? | sliding |
| What kind of friction occurs when an object rolls over a surface? | rolling |
| What kind of friction occurs when objects are not moving? | static |
| The force that pulls objects toward each other is called _______ | gravity |
| What does the universal law of gravitation state? | the force of gravity acts between all objects in the universe |
| The force of attraction between two objects varies with what two factors? | mass and distance |
| What is the force of gravity on a person or object at the surface of a planet? | weight |
| Weight is usually measured in ________ | newtons |
| When is an object said to be in free fall? | when the only force acting on an object is gravity |
| Near the surface of Earth, what is the acceleration of an object due to the force of gravity? | 9.8 m/s2 |
| Objects falling through air experience a types of fluid friction called _______ | air resistance |
| The greatest velocity a falling object reaches is called _________ | terminal velocity |
| T or F: The greater the surface area of an object, the greater the air resistance. | true |
| An object that is thrown is called a(n) | projectile |
| For an unmoving object to start moving, a ________ has to act on it | force |
| WNLOW: An object at rest, and an object moving at a constant velocity will continue moving at a constant velocity, unless it is acted upon by an unbalanced force. | newtons first law |
| What is the tendency of an object to resist a change in motion? | inertia |
| What is another name for Newton's first law? | the law of inertia |
| The amount of inertia an object has depends on its _______ | mass |
| WNLOW: Acceleration depends on the object's mass and on the net force acting on the object. | newtons second law |
| What is the equation that describes the relationship among the quantities of force, mass, and acceleration? | acceleration= net force/mass |
| How can you use Newton's second law to find force? | kg x m/s2 |
| What are two ways to increase the acceleration of an object? | by changing force or mass |
| WNLOW: If one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object. | newtons third law |
| What is the name given to the force exerted by the first object on a second object? | action force |
| What is the name given to the force exerted by the second object back on the first object? | reaction force |
| The action and reaction forces in any situation will always be _________ and ________ | equal, opposite |
| The product of an object's mass and velocity is its ______ | momentum |
| What is the equation you use to determine the momentum of an object? | momentum=mass x velocity |
| What is the unit of measurement for momentum | kilogram-meters per second |
| What does the law of conservation of momentum state? | In the absence of outside forces, the total momentum of objects that interact does not change. |
Created by:
maddiefranciscan
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