Science 3/14/05
Terms
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- Force
- A push or a pull
- Gravity
- The force that pulls everything towards the center of Earth.
- Newton
- Inventor of the reflecting telescope.
- Speed
- A measure of how far something moves during a period of time.
- Average Speed
- The measure of the total distance an object was moved divided by the total time elapsed.
- Velocity
- The speed of an object in a particular direction.
- Friction
- A force that opposes motion whenever two surfaces rub together against each other.
- Balanced forces
- The opposite forces acting on an object that cancel each other out.
- Unbalanced forces
- The forces acting on an object that cause a change in velocity, making an object speed up, slow down or change direction.
- The strength of the gravitational force between objects does not depend on their size. It depends only on the _____ of the objects and the distance between them.
- Mass
- Weight is a measure of _____.
- Gravity
- What makes moving objects stay in motion?
- Inertia
- What makes moving objects stop?
- A push or a pull
- When we walk on the ground, our feet push against the ground. At the same time, the ground pushes against our feet with _____ force.
- Equal
- Mass is a measure of _____.
- the amount of matter that makes up an object
- For every action force there is a reaction force of _____ strenght that acts in the _____ direction.
- Equal Opposite
- Give an example of a balanced force.
- Two kids (each weighing the same) on a teeter totter.
- Give an example of a unbalanced force.
- You and Amanda on a teeter totter.
- Why can you walk up a 1 mile hill in 60 minutes but it only takes 30 minutes to walk down the same hill?
- Gravity.