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Questions and Answers
What is the potential energy of a 7.9 kg cinder block sitting on a platform 20 m high? (Use $PE = mgh$ where $g = 9.81 ext{ m/s}^2$)
What is the potential energy of a 7.9 kg cinder block sitting on a platform 20 m high? (Use $PE = mgh$ where $g = 9.81 ext{ m/s}^2$)
A roller coaster at the top of a 72 m hill has no kinetic energy.
A roller coaster at the top of a 72 m hill has no kinetic energy.
True
What is the kinetic energy of a 1000-kg roller coaster car moving at a speed of 20.0 m/s?
What is the kinetic energy of a 1000-kg roller coaster car moving at a speed of 20.0 m/s?
200000 J
Energy can be neither ______ by ordinary means.
Energy can be neither ______ by ordinary means.
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Match the following scenarios with their corresponding forces:
Match the following scenarios with their corresponding forces:
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What is the average speed of a lap that took 15 seconds to complete?
What is the average speed of a lap that took 15 seconds to complete?
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According to Newton's First Law, an object in motion will continue moving indefinitely unless acted upon by an external force.
According to Newton's First Law, an object in motion will continue moving indefinitely unless acted upon by an external force.
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What does the 'F' represent in Newton's Second Law of Motion formula F = ma?
What does the 'F' represent in Newton's Second Law of Motion formula F = ma?
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The energy possessed by an object due to its position is called __________ energy.
The energy possessed by an object due to its position is called __________ energy.
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Match the following types of energy to their descriptions:
Match the following types of energy to their descriptions:
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Calculate the force required for a 1400 kg car to accelerate at 3 m/s².
Calculate the force required for a 1400 kg car to accelerate at 3 m/s².
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A force of 160 N will cause an object with a mass of 80 kg to accelerate at 2 m/s².
A force of 160 N will cause an object with a mass of 80 kg to accelerate at 2 m/s².
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The chemical bonds in sugar represent __________ energy.
The chemical bonds in sugar represent __________ energy.
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What is speed a measure of?
What is speed a measure of?
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Acceleration is the rate at which an object changes its speed.
Acceleration is the rate at which an object changes its speed.
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Define instantaneous speed.
Define instantaneous speed.
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The __________ of an object moving in a straight line measures how quickly it changes speed.
The __________ of an object moving in a straight line measures how quickly it changes speed.
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Match the following terms with their definitions:
Match the following terms with their definitions:
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In order to describe velocity completely, which of the following must be stated?
In order to describe velocity completely, which of the following must be stated?
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The Law of Conservation of Energy states that energy can be created and destroyed.
The Law of Conservation of Energy states that energy can be created and destroyed.
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What does an unbalanced force acting on an object cause?
What does an unbalanced force acting on an object cause?
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Study Notes
Physical Sciences - Trial Test
- Speed: A measure of how quickly an object moves over a distance. Calculated by dividing distance traveled by the time taken.
- Velocity: A measure of the rate of change in position. Describes the speed and direction of an object at a particular instant.
- Instantaneous speed: The speed of an object at a particular instant in time.
- Acceleration: The rate at which an object's speed changes. Calculated by dividing the change in speed by the time taken.
- Force: A push or a pull that acts on an object. Causes an object to accelerate or change its speed or direction.
- Inertia: The tendency of an object to remain at rest, or to continue moving at a constant speed and in a straight line, unless an outside force acts upon it.
- Energy: All stored energy.
- Law of conservation of Energy: Energy can not be created nor destroyed, only transformed from one form to another.
- Potential Energy: Stored energy due to an object's position or condition.
- Kinetic energy: Energy associated with the motion of an object.
- Newton's Second Law of Motion: The formula is F=ma (Force = mass x acceleration). This law explains how the mass of an object and the force acting on it affect its acceleration.
- Force Equation: A force of 210 N acts on a mass of 70 kg, the acceleration will be 3 m/s².
- Problem-solving: Use Kinetic and Potential Energy formulas (KE = 1/2mv^2 and PE = mgh) to solve word problems involving energy, velocity, mass, and height
Calculations
- Speed Calculations: Include givens, formula, calculations, and answers.
- Acceleration Calculations: Include givens, formula, calculations, and answers.
False Statement
- "A car traveling along a straight road has no forces acting on it" is false.
- There are forces acting on the car, such as friction with the road, air resistance, the gravitational pull of the earth, and possibly the force of the car's engine to maintain its motion.
Formula Examples (from Question 9)
- KE (Kinetic Energy)= 1/2 mv2
- PE (Potential Energy) = mgh
- m = mass in kilograms, v=velocity or speed in m/s, g = 10m/s/s, h = height in meters
Table Examples (from Question 3)
- Table of Lap Times & Speeds: Includes lap number, time (seconds), average speed (m/s), and average speed (km/h). Empty cells are left for completion.
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Description
Test your knowledge on key concepts in physical sciences, including speed, velocity, acceleration, and force. This trial test covers essential definitions and principles that are crucial for understanding the behavior of objects in motion. Prepare yourself for further studies in physics!
