Science IA1 Review

If you hold a ball straight out and let go, you know it will drop straight to the ground. This falling is due to earth's gravity.

If you throw a ball straight up, it does go up at first, but then it eventually comes back down.

Since gravity is a pulling force towards the earth, Jim says, "gravity must not be working on the ball while it is going up. Gravity is only working on the ball when it is going down." Is this correct? Why or why not?

• No, gravity is always working everywhere on earth.

• Yes, the ball could not be going up if gravity was pulling it.

• No, gravity just works slowly at first.

• Yes, the speed of the ball means that gravity has to catch up to it first.

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A basketball rolls to a stop along a gym floor without anyone touching it. What answer choice BEST explains why this occurred?

• The natural state of the ball is not to be in motion.

• The opposing force of friction stopped the ball.

• The initial force that started the ball ran out.

• The force of gravity slowed the ball until it stopped.

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The puppies in the picture are playing a game of tug of war with the rope toy. In the picture, each puppy is exerting the same amount of force. What will be the result when one puppy is able to exert more pull on the toy?

• The puppies will continue to play tug of war until they get too tired to play.

• The puppy that exerts more force will pull the toy away from the other puppy.

• The puppy that exerts more force will lose the toy to the puppy exerting less force.

• The puppies will never get the toy because the force of the puppies pulling will be balanced.

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A car rolls down a ramp. What is the force acting on the car that causes the movement down the ramp?

• gravity

• friction

• acceleration

• centripetal

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During a kickball game, the ball was rolled to Alex who kicked the ball hard, causing it to roll quickly past the pitcher. Which BEST explains what happened when Alex kicked the ball?

• The ball loses its energy by the time it reaches Alex, but his kick recycles that energy.

• Gravity pushed the ball toward Alex, and his kick changed its direction.

• Alex's kick caused air particle vibrations that pushed the ball backward.

• The force of Alex's kick was greater than the force of the ball, which caused the ball to change direction when it collided with his foot.

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Ed needs to move a heavy piece of furniture into a trailer that is 3 feet above the ground.

Instead of lifting the furniture, Ed wants to roll the furniture into the trailer using an inclined plane. Which of the following inclined planes would BEST allow Ed to roll the furniture into the trailer?

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A flagpole is a simple device on which a flag can be raised or lowered. Which simple machine is usually part of a flag pole?

• lever

• wedge

• pulley

• inclined plane

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This wood screw is a simple machine. It is

• a wheel and axle.

• a second class lever.

• a movable pulley system.

• an inclined plane wound around a shaft.

When the flat end of a screwdriver is used to pry open a paint can, it acts as a

• lever

• screw

• wedge

• inclined plane

How does this splitting wedge make work easier?

• increases the applied force

• decreases the applied force

• changes the direction of the applied force

• changes the direction and amount of force