Questions and Answers
Strange as it may seem, it is just as hard to accelerate a car across a horizontal frictionless surface on the moon as it is to accelerate the same car across a horizontal frictionless surface on earth because:
Passengers in the orbiting International Space Station do not experience their normal weight in flight because they are:
An object is pulled to the right with a force of 10 N and to the left with a force of 15 N. The magnitude of the net external force on the object is:
Whenever the net external force on an object is zero, its acceleration:
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What is the magnitude of the net force acting on a freely falling 50 N object?
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A 1 kg mass at rest on the earth's surface has a normal weight of:
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An object following a straight-line path at a constant speed:
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To maintain a constant velocity for a sliding object, with a force of friction of 10 Newtons, you would have to apply a constant forward force that is:
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A man with a normal weight of 800 Newtons stands at rest on two bathroom scales. The reading on each scale is:
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A banana has a normal weight of 1 Newton. When you hold the banana with your hand at rest, the net force on the banana is:
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You are accelerating upward in an elevator while standing on a bathroom scale. Compared to your normal weight, your apparent weight is:
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When a falling object has reached its terminal velocity, its acceleration is:
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A heavy person and a light person wish to parachute at equal terminal velocities through air. To do so, the heavy person will have to:
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A hockey puck is set in motion across a flat horizontal frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at a constant velocity is:
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A push on a 10 kg book accelerates it. To equally accelerate a 1 kg brick, you would have to push with:
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A tow truck exerts a constant net force of 3000 Newtons on a car with a mass of 1500 kg. What is the acceleration of the car in m/s/s?
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A bag of groceries from Harris Teeter is resting on your kitchen counter. Its mass is 10 kg and its normal weight is about:
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A 10 kg brick and a 1 kg book are dropped in a vacuum. The force of gravity on the 10 kg brick is:
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Study Notes
Newton's Laws and Forces
- Accelerating a car horizontally is equally challenging on the moon and Earth due to gravity's non-effect on horizontal motion.
- Passengers in a high-flying jet feel their weight, while those in the International Space Station experience weightlessness because they are in free fall.
- A net external force of 10 N right and 15 N left results in a net force of 5 N left.
Motion and Acceleration
- When the net external force on an object is zero, acceleration is also zero, indicating a state of rest or constant velocity.
- A freely-falling 50 N object experiences a net force of 50 N downwards.
- A 1 kg mass at rest weighs 9.8 N on Earth's surface due to gravitational pull.
Constant Velocity and Friction
- An object moving at constant speed in a straight line experiences zero acceleration, meaning net force is zero.
- To maintain a constant velocity on a sliding object with a friction force of 10 N, a forward force of 10 N is required.
Weight Distribution and Net Forces
- An 800 N person standing evenly on two scales will show a reading of 400 N on each scale.
- When holding a banana weighing 1 N at rest, the net force on it is zero, indicating balance.
Apparent Weight and Terminal Velocity
- Accelerating upwards in an elevator causes a temporary increase in apparent weight compared to normal weight.
- At terminal velocity, a falling object's acceleration becomes zero, indicating no further increase in speed.
Parachuting and Forces
- A heavier person parachuting must use a larger parachute to match the terminal velocity of a lighter person.
- A hockey puck sliding on a frictionless surface requires zero force to maintain constant velocity.
Acceleration and Forces on Objects
- A 10 kg book requires a lighter push compared to its mass, as 1 kg would require only 1/10 the force for equal acceleration.
- A tow truck applying 3000 N on a 1500 kg car results in an acceleration of 2 m/s².
- A 10 kg grocery bag resting has a normal weight of about 100 N.
Gravitational Force
- The gravitational force on a 10 kg brick is ten times that of a 1 kg book when both are dropped in a vacuum.
Studying That Suits You
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Description
Prepare for your upcoming exam with these flashcards covering key concepts from Chapter 4 of your physics textbook. This quiz will test your understanding of important principles such as motion on different planetary surfaces and the effects of gravity. Maximize your revision and boost your confidence before the test.
