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PHYSICS TEST 1
| Question | Answer |
|---|---|
| What is Newton's first law? | Every object in motion remains in motion unless external force is applied to it |
| What is Newton's second law? | The direction of the force vector is the same as the direction of the acceleration vector |
| What are vectors? | Acceleration and force |
| What is Newton's third law? | For every action there is an equal and opposite reaction |
| What law is the law of inertia or Galileo's concept of inertia | Newton's first law |
| step off a boat onto the bank of a lake: as we move in the direction of the shore, the boat tends to move in the opposite direction is an example of | Newton's third law |
| an object with a certain velocity maintains that velocity unless a force acts on it to cause an acceleration is an example of | Newton's second law |
| Which has a greater momentum, a heavy truck at rest or a moving automobile? | The truck at rest has no speed, hence no momentum. So the moving automobile has greater momentum |
| How can a supertanker have a huge momentum when it moves relatively slowly? | It has a huge momentum because its mass is so huge |
| The running speed of Fast Freddy doubles, what else doubles? | His momentum |
| A 1-kg ball has the same speed as a 10-kg ball. Compared with the 1-kg ball, the 10-kg ball has | 10 times as much momentum |
| Two iron balls, one twice the mass of the other, are dropped from rest from the top of a one-story building. Compared with the lighter ball, the twice-as-heavy ball when hitting the ground below has | twice the momentum |
| If the mass of a cart full of groceries decreases to half and its speed doubles, the momentum of the cart | remains unchanged |
| Your friend says the impulse equals momentum. You disagree and say the friend is missing an important word, which is | change |
| The impulse-momentum relationship is a direct result of Newton's | newton's second law |
| Which of the following equations best illustrates the usefulness of automobile air bags? | Ft = change in mv |
| When you jump from an elevated position to the ground below, the force you experience when landing depends on | how your knees bend, jumping height, softness/hardness |
| Standing on a skateboard, you toss a ball horizontally away from you. The mass of the ball is one-tenth your mass. Compared with the speed you give to the ball, your ideal recoil speed will be | one-tenth as much |
| A big fish swims upon and swallows a small fish at rest. After lunch, the momentum of the big fish is | the same as before |
| how much work is done on a 100 kg crate that is hoisted 2m in a time of 4s | 100 x 10N = 1000 x 2m = 2000j |
| How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s? | 200 x 10 = 2000 x 2m = 4000/4 = 1000 Watts |
| Raising an auto in a service station requires work. Raising it twice as high in the same time requires | twice the power |
| A model airplane moves 3 times as fast as another identical model airplane. Compared with the kinetic energy of the slower airplane, the kinetic energy of the faster airplane is | more than 4 times as much |
| A shiny sports car at the top of a vertical cliff has a potential energy of 100 MJ relative to the ground below. Unfortunately, a mishap occurs and it falls over the edge. When it is halfway to the ground, its kinetic energy is | 50 mj |
| In an ideal pulley system, a woman lifts a 100-N crate by pulling a rope downward with a force of 25 N. For every 1 m length of rope she pulls downward, the crate rises | W = f x d 25N x 1m = 25cm |
| When 100 J are put into a device that delivers 40 J the efficiency of the device is | 40% |
| A machine cannot multiply | energy |
| The force of gravity between two planets depends on their | masses and distance apart |
| When the distance between two stars decreases by half, the force between them | increases to 4 times |
| If the sun were twice as massive, it's pull on Mars would be | twice |
| When an astronaut in orbit is weightless, he or she is | still in the grips of Earth's gravity |
| When no air resistance acts on a fast-moving baseball, its acceleration is | downward |
| When you toss a projectile sideways/horizontally, it curves as it falls. It will be an Earth satellite if the curve it makes | matches the curved surface of Earth |
| the speed of a satellite in an elliptical orbit | varies |
| A satellite in elliptical orbit about Earth travels fastest when it moves | close to the earth |
| a satellite in earth orbit is above earth's | atmosphere |
| An object at rest stays at rest, an object in motion stays in motion is an example of | Newton's 1st law |
| acceleration of an object is dependent upon two variables, the net force acting upon the object and the mass of the object is an example of | Newton's 2nd law |
| A force is a push or a pull that acts upon an object as a results of its interaction with another object is an example of | Newton's 3rd law |
Created by:
lramire