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42 Cards in this Set
- Front
- Back
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If the force acting on a cart doubles, what happens to the cart's acceleration? |
It doubles |
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The unit of pressure is |
Idk |
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A 20-N falling object encounters 4 N of air resistance. The magnitude of the net force on the object is |
16N |
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A tennis ball and a solid steel ball with the same diameter are dropped at the same time. In the absence of air resistance, which ball has the greater acceleration? |
The both have the same acceleration |
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Which of the following would exert the most pressure on the ground? |
A woman standing in high heel shoes |
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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 N |
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When the angle of an incline with a block resting on it increases, the normal support force |
Decreases |
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A 6-N falling object encounters 6 N of air resistance. The magnitude of the net force on the object is |
0 N |
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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 |
4m/s^2 |
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An object has a constant mass. A constant force on the object produces constant |
Acceleration |
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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. |
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A speeding truck locks it brakes and it skids to a stop. If the truck's total mass were doubled, its skidding distance would be |
The same |
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How much force is needed to accelerate a 4.0-kg physics book to an acceleration of 2.0 m/s2? |
8.0 N |
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The acceleration produced by a net force on an object is |
All of the above |
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A book weighs 4 N. When held at rest in your hands, the net force on the object is |
0N |
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Accelerations are produced by |
Forces |
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A jet has a mass of 40,000 kg. The thrust for each of four engines is 20,000 N. What is the jet's acceleration when taking off? |
2 m/s2 |
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An apple weighs 1 N. The net force on the apple when it is in free fall is |
1N |
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Pressure is defined as |
Force per area |
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Suppose the force of friction on a sliding object is 25 N. The force needed to maintain a constant velocity is |
25 newton's |
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If you pull horizontally on an object with a force of 150 N and the object doesn't move, the friction force must be 150 N. Now if you pull with 250N so the object slides at constant velocity, the friction force is |
250 N |
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When a woman stands with two feet on a scale, the scale reads 280 N. When she lifts one foot, the scale reads |
280 N |
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A tennis ball and a solid steel ball with the same diameter are dropped at the same time. Which ball has the greater force acting on it? |
The steel ball |
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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 |
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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 |
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A car has a mass of 1500 kg and accelerates at 5 meters per second squared. What is the magnitude of the force acting on the car? |
7500 n |
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A push on a 1-kilogram brick accelerates the brick. Neglecting friction, to equally accelerate a 10-kilogram brick, one would have to push |
With 10 times as much force |
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A box is dragged without acceleration in a straight-line path across a level surface by a force of13 N. What is the frictional force between the object and the surface? |
13 N |
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As a care package falls from a high-flying stationary helicopter, its velocity increases and its acceleration |
Decreases |
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A rock is thrown vertically into the air. At the very top of its trajectory the net force on it is |
Idk |
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When an object reaches terminal velocity its acceleration is |
0m/s2 |
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A girl pulls on a 10-kg wagon with a constant force of 20 N. What is the wagon's acceleration? |
2m/s2 |
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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. |
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Suppose a cart is being moved by a force. If suddenly a load is dumped into the cart so that the cart's mass doubles, what happens to the cart's acceleration? |
It halves. |
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How does acceleration of an object change in relation to its mass? It is |
inversely proportional |
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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 |
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A heavy person and a light person parachute together and wear the same size parachutes. Assuming they open their parachutes at the same time, which person reaches the ground first? |
The heavy person. |
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Consider a ball rolling down the decreasing slope inside a semicircular bowl (the slope is steep at the top rim, gets less steep toward the bottom, and is zero (no slope) at the bottom). As the ball rolls from the rim downward toward the bottom, its rate of gaining speed |
Decreases |
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The terminal speed for a person parachuting (with the chute open) is about |
15km/h |
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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 |
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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 |
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Aunt Minnie throws a rock downward, and air resistance is negligible. Compared to a rock that is dropped, the acceleration of the rock after it is thrown is |
The same |
