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21 Cards in this Set
- Front
- Back
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A push or a pull. It has both size and direction.
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Force
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The force that results from combining forces exerted on an object.
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Net force
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What do you do when the forces are in the same direction? (how do you get the net force?)
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Add.
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What do you do when the forces are in different directions? (how do you get the net force?)
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Subtract.
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the combination of two velocities. The velocities should be added together if they are going the same direction, and subtracted if the objects are going in opposite directions.
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Resultant velocity
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A force with a greater net force than zero
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Unbalanced force
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A force with a net force of zero
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Balanced force
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If an object is accelerating, will it have balanced or unbalanced forces acting upon it?
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It will create an unbalanced force, because there is a change in motion. The speed is not constant.
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What is necessary for a change in motion (acceleration)?
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An unbalanced force
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Can an object be in motion and have balanced forces acting on it?
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Yes. If an object is moving at a constant velocity and it is not accelerating, it has balanced forces acting on it.
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A force that opposes motion between two surfaces that are touching.
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Friction
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What causes friction?
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The surfaces of the touching objects
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Why is surface important to friction?
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All surfaces have microscopic hills and valleys. The rougher the surface the more friction there is.
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What effect does force have on friction?
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The greater the force, the more friction occurs. If you increase the force, the objects are in closer contact, creating more friction.
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A force of attraction between two objects that is due to their masses.
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Gravity
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What is gravity a result of?
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Mass
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What is the Law of Universal Gravitation?
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All objects in the universe attract each other through gravitational force. The size of the force depends on the masses of the objects and the distances between them.
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What are the two parts of the Law of Universal Gravitation?
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Part 1: gravitational force increases as mass increases
Part 2: gravitational force decreases as distance increases |
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A measure of the gravitational force exerted on an object. We measure this in Newtons and we use a spring scale as a tool.
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Weight
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The amount of matter in an object; its value does not change. The units are grams or kilograms and we measure it using a triple beam balance.
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Mass
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What is the difference between mass and weight?
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Weight is a measurement of gravitational force, therefore it changes when gravity changes. Mass is not affected by gravity and does not change when gravity changes.
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