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40 Cards in this Set
- Front
- Back
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The inertia of an object is related to its:
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Mass Only |
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The property of matter that resists changes in motion is:
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Inertia |
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As the mass of an object is increased, what happens to its inertia?
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It Increases |
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If each of the barbells were pushed up with a force of 100 newtons, which would be harder to move?
10kg 20kg 30kg |
The 30kg Barbell |
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An object moving with constant speed has:
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A net force equal to Zero |
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A 0.15-kilogram baseball and a 7.25-kilogram bowling ball are both rolling along at 3 m/s. Which object is easier to stop and why?
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The baseball because it has less inertia |
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An object at rest has:
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Inertia but no momentum |
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The equation that correctly expresses Newton’s second law is:
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Force=mass X acceleration |
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A 200-kg rocket accelerates at 50 m/s/s. How large is the force required to cause an acceleration of this size?
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10,000 Newtons |
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Cheung pushes on a toy car, and it accelerates at 0.22 meters per second per minute. Carlos pushes on the same toy car with twice as much force as Cheung. Compare the acceleration when Carlos pushes the car to when Cheung pushes the car.
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The acceleration is twice as much |
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Brandon and his skateboard together have a mass of 100 kg. How fast will he accelerate on his skateboard if he’s pushed forward with a net force of 100 N?
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1 m/s/s |
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The inertia of an object is related to its:
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Mass only |
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Tessa uses a toy slingshot to launch a tennis ball across the park for her dog to fetch. For her first launch, she uses 50 N of force. Her second launch uses 100 N of force, and her third launch uses 150 N. Which launch had the greatest acceleration of the tennis ball?
50 N launch 100 N launch 150 N launch |
150 N launch |
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As the mass of an object is increased, what happens to its inertia?
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It increases |
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A book rests on a table. The force of gravity pulls down on the book with a force of 20 newtons. What prevents the book from accelerating downward at 9.8 m/s/2?
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The table presses back up on the book with an equal and opposite force of 20 newtons.
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Newton’s third law of motion involves:
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a force pair acting on two different objects.
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Even though every action force has an equal but opposite reaction force, they do not cancel one another and motion may still occur because the:
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action and reaction forces are applied to different objects.
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According to Newton’s third law, an action reaction pair of forces have:
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equal magnitudes in opposite directions.
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The momentum of an object depends on what two factors?
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Mass and Acceleration |
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A kayaker paddles her boat through the water. Which of the following are an action/reaction pair in this situation?
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The force of the water pushing on the paddle and the force of the paddle pushing on the water.
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The term that means “all of the forces together on an object” is:
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Net Force |
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Newton’s first law of motion is also known as:
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The law of inertia |
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Which of the following barbells has the most inertia?
10kg 20kg 30kg |
30kg Barbell |
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A ball is rolling down a level sidewalk. As it roll, it slows down and stops. Why?
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Frictional force acts on the ball to stop it.
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Changes in motion come from:
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Unbalenced Forces |
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A ball with a mass of 1 kg is moving in a straight line at the same speed as a ball with a mass of 10 kg. Both balls are brought to rest in 4.0 seconds. What is true of the force required to stop the balls?
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It takes less force to stop the 1 kilogram ball because it has less inertia
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Compare the inertia and momentum of a 0.15-kilogram baseball moving at 50 m/s with the inertia and momentum of a 7.25-kilogram bowling ball moving at 1 m/s.
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The bowling ball has more inertia, but the baseball has more momentum.
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A tow truck pulls a 2,000-kg car with a net force of 4,000 N. What is the acceleration of the car?
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2 m/s/s |
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A cart is rolling down a special ramp where there is no friction at all. What will happen if the amount of mass on the cart is increased?
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The cart's acceleration will not be affected |
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A 2.0-kg ball rolls down a ramp. If the ball accelerates at a rate of 12 m/s/s, the net force causing the acceleration is:
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24 Newtons |
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A 20-kg dog on ice skates is accelerating at 2 m/s/s. What is the net force on the dog?
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40 N |
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The term that means “all of the forces together on an object” is:
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Net Forces |
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The property of matter that resists changes in motion is:
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Inertia |
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Roger Federer, Swiss tennis star, hits a 60-gram tennis ball with a force of 3 newtons. The ball accelerates at a rate of:
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50 m/s/s |
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A rocket can fly into space because:
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the rocket pushes the exhaust gases backward, and there is an equal and opposite reaction pushing the rocket forward.
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“Forces occur in pairs” is another way of stating Newton’s:
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Third law of motion |
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“Every action force creates a reaction force that is equal in strength and opposite in direction.” This statement summarizes Newton’s:
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3rd law of motion.
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The momentum of an object depends on what two factors?
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Mass and acceleration
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A boy and the skateboard on which he is standing have a combined mass of 60 kilograms. He throws a 1-kilogram rock forward at 20 m/s. At what speed will the boy roll backward?
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0.33 m/s
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A force of 50 newtons is exerted by a bat on a baseball. The force exerted by the baseball on the bat is:
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50 newtons.
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