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### 52 Cards in this Set

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 a push or a pull force a change in position motion the measure of how fast something moves over a certain distance speed the force that pulls objects towards each other gravity the measure of the pull of gravity on an object weight examples of pushes push a chair push a car roll a ball push a cart push a lawnmower examples of pulls pull a door pull a string pull a truck tailgate pull a toy What are some forces? push or pull What causes motion? a force Put in order from least to greatest speed: person biking race car person walking race horse person walking person biking race horse race car What does weight measure? the effects of gravity on an object What would be a strong force? gravity How are the motions of a car and plane alike? motion caused by a force change in position How are the motions of a car and plane different? Different speeds Use different force to move What is the result of unbalanced forces? motion What is the result of balanced forces? nothing happens Two cars travel the same distance. What would tell you that one car had a faster speed than the other car? The car that gets there first has the faster speed. Where is gravity greater, on Earth or the moon? The Earth because earth has more mass than the moon. Where would your weight be greater, on Earth or the moon? On Earth because the moon is smaller (less gravity). If you weighed 100 pounds on earth, you would weigh 16.6 pounds on the moon. Work or no work: Push a roller chair across the room Work Take a crayon out of the crayon tub work Kick a ball work Write a number on the chalkboard work Turn the pages and read a book work Watch a video no work Push against the chalkboard with your hand no work Walk to the door work Don't move. Sit where you are no work Read the words on the bulletin board work Write your name using a computer work Ride in a car no work Where are forces? Forces are all around us. They allow us to run, throw a ball, or ride a bicycle. T/F If an object is at rest, it will remain at rest forever? False. It will remain at rest until a force (push/pull) is applied to it. T/F An object in motion will continue to move in a straight line at a constant speed unless a force acts on it. True T/F When the force on an object is decreased, the speed increases. False. Increase in force causes increase in speed A force caused by two objects rubbing against each other Friction T/F The motion of an object is affected by friction. True A force that gives things weight and makes them fall. Gravity T/F The motion of an object is not affected by gravity. False T/F A force can change the direction an object is moving. True T/F A force cannot change the shape of an object. False A cyclist pedals harder to pass another cyclist. Force Fact: When the force on an object is increased, the speed increases. A diver bounces off a diving board and plunges down into the water. Force Fact: The motion of an object is affected by gravity. A golfer putts a ball into the cup at the 18th green. Force Fact: If an object is at rest, it will remain at rest until a force is applied to it. A tennis player hits a ball back into his opponent's court. Force Fact: A force can change the direction of an object is moving. A baseball player slides into third base. Force Fact: The motion of an object is affected by friction. A race-car driver turns the steering wheel of her car as she moves around the track. Force Fact: A force can change the direction an object is moving. A bicycle tire fills with air. Force Fact: A force can change the shape of an object. A race-car driver slams on the brakes. Force Fact: An object in motion will continue to move in a straight line at a constant speed unless a force acts on it. A football player kicks a field goal. Force Fact: If an object is at rest, it will remain at rest until a force is applied to it. A soccer goalie saves a goal. Force Fact: An object in motion will continue to move in a straight line at a constant speed unless a force acts on it. T/F I like getting good grades on tests? ????