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### 47 Cards in this Set

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 A measure of how far something travels in a certain period of time A. speed B. velocity C. inertia A measure of speed in a certain direction A. speed B. velocity C. inertia Speed is equal to what? Distance divided by Time Tendency of an object to stay at rest or to remain in motion unless an outside force causes a change A. speed B. velocity C. inertia What is needed to overcome inertia? A force When riding a bike, how do you overcome inertia? By pushing on the pedals What helps prevent people from continuing to move forward when a car stops quickly? Seatbelts When riding a bike what keeps it moving forward even after you stop applying force? Inertia What will slow a bike down? The drag of the air or the roughness of the ground What is the force that causes objects to fall toward the earth? Gravity For every action there is what? An equal and opposite reaction When you take a step forward and push down on the earth, the opposite force is what? The earth pushing back with equal strength A force that acts to pull pairs of objects together A. gravity B. mass C. weight D. acceleration The amount of matter in an object A. gravity B. mass C. weight D. acceleration The force gravity exerts on an object's mass A. gravity B. mass C. weight D. acceleration The rate of change in speed of direction of movement A. gravity B. mass C. weight D. acceleration What always stays the same? Your mass What can change if you travel to another planet? Weight If you shoot an arrow into the air, what brings it back to earth? Gravity Could you jump higher and farther on the moon or here and why? On the moon, because the force of gravity is less on the moon If you have greater mass the gravitiional attraction will be more or less? More If you have less mass the gravitional attraction will be more or less? Less The greater the distance the more or less gravitional attraction? Less The less the distance the more or less gravitional attraction? More What accelerates (goes faster) the rate at which objects fall? Gravity Objects will fall faster as the distance between the earth and the object what? Decreases A force that resists the movement of one surface past another surface A. friction B. air resistance C. streamline Friction causes by gas molecules in the air hitting an object and slowing it down A. friction B. air resistance C. streamline To design smooth, rounded surfaces on an object so it slips through the air with the least possible resistance A. friction B. air resistance C. streamline What surfaces produce the least amount of friction? Smooth, slippery, icy or waxed surfaces Rough bumpy surfaces produce greater what? Friction Why do wheels make a suitcase easier to move? Because they produce less friction What slows the motion of objects? Air resistance If an object has a streamlined design, what is the object designed to do? Reduce the air resistance When applying brakes on ice you will want to do what to the friction to prevent slipping? Increase the friction When moving heavy objects what do you want to do to the friction to help moving the object? Decrease the friction A force that resists the movement of one surface past another surface A. friction B. air resistance C. streamline Friction causes by gas molecules in the air hitting an object and slowing it down A. friction B. air resistance C. streamline To design smooth, rounded surfaces on an object so it slips through the air with the least possible resistance A. friction B. air resistance C. streamline What surfaces produce the least amount of friction? Smooth, slippery, icy or waxed surfaces Rough bumpy surfaces produce greater what? Friction Adding oil or grease between sliding surfaces will do what to friction, increase or reduce it? Reduce friction Will applying brakes to wheels increase or reduce friction? Increase friction When you put sand or gravel on icy ground will that increase or reduce friction? Increase friction When adding wax to a smooth floor, will that increase or reduce friction? Reduce friction When adding wheels to a heavy chair, will that increase or reduce friction? Reduce friction Science Flashcards Unit B Chapter 2 Investigating Motion Science Flashcards Unit B Chapter 2 Investigating Motion