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Chapter 3- Forces
8th Grade Science
| Question | Answer |
|---|---|
| What is any push or pull on an object? | Force |
| What is the force that opposes motion between two surfaces in contact with each other? | Friction |
| What is the force exerted by air on a moving object? | Air Resistance |
| What type of friction is between two surfaces that are not moving past each other? | Static Friction |
| What type of friction is between the wheels of a car in motion and the road? | Rolling Friction |
| What is the largest velocity that is reached by a falling object when the force of air resistance equals the force of gravity? | Terminal velocity |
| What is the force that every object in the universe exerts on every other object? | Gravity |
| What is the pull of gravity on an object? | Weight |
| What is the amount of matter in an object? | Mass |
| What is it called when gravity is the only force acting on a falling object (no air resistance)? | Free Fall |
| What is the force that keeps an object moving in a circle? | Centripetal Force |
| What type of acceleration does a space shuttle in orbit have due to gravity and inertia? | Centripetal Acceleration |
| What is anything thrown or shot through the air called? | Projectile |
| What is the path of a projectile called? | Trajectory |
| What is the property of a moving object resulting from its mass and velocity? | Momentum |
| What is the force that keeps the moon in orbit around the earth? | Gravity |
| How is the relationship among mass, force and acceleration explained? | Newton's second law of motion |
| What causes a piece of paper to fall through the air more slowly than a boulder? | Air resistance |
| In absence of air, a penny and a feather that are dropped from the same height at the same time will___. | fall at the same rate |
| When an object moves in a circular path, it accelerates toward the center of the circle as a result of___. | Centripetal Force |
| The path of a projectile is ___. | Curved |
| For any object, the greater the force that's applied to it, the greater its ___ will be. | Acceleration |
| The size of the gravitational force between two objects depends on their ___. | masses and the distance between them |
| As you get farther from the center of the Earth, you weight will ___. | Decrease |
| When a force is exerted on a box, an equal and opposite force is exerted by the box. These forces are called ___ forces. | Action-reaction |
| What kind of friction occurs when a person slams on their brakes and the car skids to a stop? | Sliding friction |
| What does p represent in the equation p=m*v? | Momentum |
| What is Newton's Third Law of Motion? | To every action there is an equal and opposite reaction |
| What is the unit for momentum? | kg* m/s |
| When two balls collide, the momentum of the balls after the collision is explained by __. | The law of the conservation of momentum |
| An object that is in free fall seems to be ____. | Weightless |
| If gravity did NOT affect the path of a horizontally thrown ball, the ball would ___. | Travel horizontally |
| Because of projectile motion, when aiming at a target you should always aim ____. | Above the bull's eye |
| What causes friction? | Friction is caused by microwelds |
| A book and a piece of paper, the same size, fall at different rates. How can you change the shape of the paper so it will fall at nearly the same rate as the book? | The paper can be changed by crumbling it into a ball. It has less air resistance this way. |
| Explain how mass and weight are measured differently in science. | Mass is measured in grams on a balance while weight is measured in Newtons with a spring scale. |
| Explain the action-reaction forces of a rocket in space. | The rocket pushes gases and the gases push the rocket. |
| Sally throws a ball horizontally from the top of a tall building at the same time Pete drops a ball from the top of the same building. Which ball will hit the ground first? | Both of the balls will have the same gravity acceleration so they will hit at the same time. |
Created by:
katiesmith
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