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20 Cards in this Set
- Front
- Back
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What is a force?
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a push or pull
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What is net force?
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The force you get from combining all the forces exerted on an object.
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When do we add forces?
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When they are in the same direction.
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When do we subtract forces?
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When they go in different directions.
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What happens when forces are unbalanced?
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movement occurs.
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What happens when forces are balanced?
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no movement.
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What is friction?
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A force that oposses motion when 2 objects are touching.
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What 2 conditions determine the amount of friction?
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1. roughness of the surface
2. the force pushing the surfaces together |
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What are the four types of friction?
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sliding
rolling fluid static |
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What type of friction uses the greatest force?
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Sliding
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Which type of friction has no movement?
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Static
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What is gravity?
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A force of attraction between objects due to their masses
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What type of force is gravity?
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a pull
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What happens to gravitational force as mass increases?
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the force increases
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What happend to gravitational force as distances increases?
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the force decreases
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What is weight?
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A measure of gravitational pull
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How is weight measured?
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using a spring scale and the unit "newtons"
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What is mass?
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The amount of matter in an object.
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How is mass measured?
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Using a balnce and the unit "grams"
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Which is not constant, weight or mass?
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weight.
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