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Physics Fall Final
Physics Fall Final Ch. 1-6
| Question | Answer |
|---|---|
| Which one of the following steps is NOT a part of the scientific method? | Repeat the experiments until the answers match the predictions. |
| In the absence of air resistance, objects fall at constant | acceleration. |
| What is the minimum resultant possible when adding a 5-N force to 8-N force? | 3 N |
| If you pull horizontally on a with a force of 150 N and the doesn't move, the friction force must be 150 N. Now if you pull with 250 N so the slides at constant velocity, the friction force is | 250 N |
| An object is dropped and falls freely to the ground with an acceleration of g. If it is thrown upward at an angle instead, its acceleration would be | g downward. |
| A tow truck exerts a force of 2000 N on a car, accelerating it at 1 m/s/s. What is the mass of the car? | 2000 kg |
| A has a mass of 1500 kg and accelerates at 5 meters per second squared. What is the magnitude of the force acting on the ? | 7500 N |
| A force is exerted on the tires of a car to accelerate the car along the road. The force is exerted by the | road |
| Suppose two people, one having 3 times the mass of the other, pull on opposite sides of a 20-meter rope while on frictionless ice. After a brief time, they meet. The more massive person slides a distance of | 5 m |
| A karate chop delivers a blow of 2300 N to a board that breaks. The force that acts on the hand during this feat | 2300 N |
| You would have the largest mass of gold if your chunk of gold weighed 1 N on | Jupiter |
| A starts from rest and after 7 seconds it is moving at 42 m/s. What is the ’s average acceleration? | 6 m/s2 |
| A hypothesis is | an educated guess that has yet to be proven by experiment |
| Acceleration is defined as the CHANGE in | velocity divided by the time interval |
| Forces always occur | in pairs. |
| Which best approximates the resultant of a pair of 6-unit vectors at right angles to each other? | 8 units |
| What would be the safest way to put up a clothesline? | With some slack in the line |
| The reason a tennis ball and a solid steel ball will accelerate at the same rate, in the absence of air resistance, is that | the ball with the larger force also has the larger mass |
| Two people pull on a rope in a tug-of-war. Each pulls with 400 N of force. What is the tension in the rope? | 400 N |
| To test a scientific hypothesis you would | set up many experiments and look at the results |
| Consider drops of water leaking from a water faucet. As the drops fall they | get farther apart |
| A ball is thrown straight up. At the top of its path its instantaneous speed is | 0 m/s |
| Suppose you take a trip that covers 180 km and takes 3 hours to make. Your average speed is | 60 km/h |
| In the absence of air friction, the horizontal component of a projectile's velocity doesn't change as the projectile moves. | Always true |
| Which has more mass, a kilogram of feathers or a kilogram of iron? | Neither—they both have the same mass. |
| A player catches a ball. Consider the action force to be the impact of the ball against the player's glove. What is the reaction to this force? | The force the glove exerts on the ball |
| A large truck and a small car traveling at the same speed have a head-on collision. The vehicle to undergo the greater change in velocity will be | the small car |
| You pull horizontally on a 50-kg crate with a force of 450 N and the friction force on the crate is 250 N. The acceleration of the crate is | 4 m/s2 |
| A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always | directed downward |
| Suppose a is moving in a straight line and steadily increases its speed. It moves from 35 km/h to 40 km/h the first second and from 40 km/h to 45 km/h the next second. What is the car's acceleration? | 5 km/h·s |
| A freely falling object starts from rest. After falling for 6 seconds, it will have a speed of about | 60 m/s |
| The horizontal component of a projectile's velocity is independent of | the vertical component of its velocity |
| What is the resultant of a 3-unit vector and 4-unit vector at right angles to each other? | 5 units |
| The law of inertia states that an object | will continue moving in a straight line unless an outside force acts on it |
| Compared to its weight on Earth, a 10-kg object on the moon will weigh | less |
| The force required to maintain an object at a constant speed in free space is equal to | zero |
| A 100-N lantern is suspended by a pair of ropes with 120 degrees between them (each 60 degrees from the vertical). The tension in each rope is | 100 N |
| A bag of sports equipment has a mass of 10.0 kilograms and a weight of | 98 N |
| How does acceleration of an object change in relation to its mass? It is | inversely proportional |
| A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is | 10 times as much as the force on the 1-kg book |
| An apple weighs 1 N. The net force on the apple when it is in free fall is | 1 N |
| A bag is dragged without acceleration in a straight-line path across a level surface by a force of 13 N. What is the frictional force between the and the surface? | 13 N |
| Pressure is defined as | force per area |
| The terminal speed for a person parachuting (with the chute open) is about | 15 km/h |
| f the force acting on a cart doubles, what happens to the cart's acceleration? | It doubles |
| Whenever an object exerts a force on another object, the second object exerts a force of the same magnitude, but in the opposite direction to that of the first object. | Always true |
| A jumbo jet cruises at a constant velocity when the total thrust of the engines on the jet is 50,000 N. How much air resistance acts on the jet? | 50,000 N |
| If you drop a feather and a coin at the same time in a vacuum tube, which will reach the bottom of the tube first? | Neither-they will both reach the bottom at the same time |
| If a projectile is fired straight up at a speed of 30 m/s, the total time to return to its starting point is about | 6 seconds |
| A cannonball is launched horizontally from a tower. If the cannon has a barrel velocity of 60 m/s, where will the cannonball be 1 second later? (Neglect air resistance.) | 60 m downrange |
| A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. The reason this can be done is that | the milk carton has inertia |
| The mass of a sheep that weighs 110 N is about | 11 kg |
| A boy whose weight is 500 N hangs from the middle of a bar supported by two vertical strands of rope. What is the tension in each strand? | 250 N |
| A 5-N force and a 30-N force act in the same direction on an object. What is the net force on the object? | 35 N |
| Accelerations are produced by | forces |
| When an object reaches terminal velocity its acceleration is | 0 m/s2. |
| A force of 3 N accelerates a mass of 3 kg at the rate of 1 m/s2. The acceleration of a mass of 6 kg acted upon by a force of 6 N is | the same |
| Suppose a particle is accelerated through space by a constant 10-N force. Suddenly the particle encounters a second force of 10-N in a direction opposite to that of the first force. The particle | continues at the speed it had when it encountered the second force |
| A block is at rest on an incline. The force of friction necessary to prevent the block from sliding increases when the incline angle is | increased |
| You are on a frozen pond, and the ice starts to crack. If you lie down on the ice and begin to crawl, this will | decrease the pressure on the ice |
| A 6-N falling object encounters 6 N of air resistance. The magnitude of the net force on the object is | 0 N |
Created by:
Cinda