Newton's Laws
Quiz by Kylie Middleton
Grade 8
Science (2017)
Texas Essential Knowledge and Skills (TEKS)
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9 questions
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- Q1Newton’s first law of motion, applied to a book sitting on a table, would explain that the book will not move until which of the following conditions is met?Unbalanced forces act on the bookGravity on the book can be reduced to zero.Friction is exerted on the book.Balanced forces act on the book.30s8.6c
- Q2The masses of four objects are given in this table. If all of the objects have the same acceleration, which will require the greatest force to move?Object 1Object 4Object 2Object 330s8.6c
- Q3According to Newton’s third law of motion, if someone jumps off a skateboard, the skateboard will roll backward because–for the force that sent the person forward, there is an equal force pushing back on the skateboard.the mass of the skateboard is the same as the mass of the person jumping off.the pull of gravity on the person is the same as the pull on the skateboard, regardless of size.the air resistance on the person is great, and the friction on the skateboard is small.30s8.6c
- Q4A bowling ball is rolled with a certain speed and strikes a bowling pin with a force indicated by the arrow in this illustration. When the bowling ball strikes the bowling pin, the force applied by the pin to the ball–is equal to the force of gravity on both.must be zero, since the pin is not moving.is equal to the force applied by the ball.depends on the mass of the bowling pin.30s8.6c
- Q5A ball thrown into the air starts out with an initial upward velocity but eventually slows and stops before falling back to the ground. Which of the following contributes the most to the change in the motion of the ball?The increase of inertiaThe initial force with which the ball was thrownThe resistance against the atmosphereThe downward force of gravity30s8.6c
- Q6Safety belts protect people in cars in the event of an accident because, according to Newton’s laws of motion, when an impact causes the car to suddenly change its motion–the speed of the car always increases, giving it greater force since the mass will remain the same.the car now has a greater overall mass—its own mass plus the mass of the object by which it has been struck.the people in the car will continue to move in the same direction and at the same speed as before the impact.the speed of the people always increases, since now they have not one but two forces acting on them.30s8.6c
- Q7What amount of force needs to be applied to a 20-kg bowling ball to give it an acceleration of 5 m/s.4 N25 N250 N100 N30s8.6c
- Q8Examine the table provided. Which of the objects is producing the greatest force?FootballRacquetballBasketballGolf ball30s8.6c
- Q9How does Newton’s third law explain how a rocket takes off?The rocket is at rest until ignition.The rocket’s acceleration is positive, while the gasses acceleration is negative but the direction is the same.The hot gasses move in one direction, while the rocket moves in the opposite direction but with equal force.30s8.6c
