Podcast
Questions and Answers
What are the base units for length, mass and time in the SI system?
What are the base units for length, mass and time in the SI system?
Mass, Kilogram and seconds
Give 2 examples of derived units in the SI system.
Give 2 examples of derived units in the SI system.
Newtons and Liters
How many significant figures does 300.0 m/s have?
How many significant figures does 300.0 m/s have?
4
If two marbles roll off either side of a table at the same time but with different velocities, which marble hits the ground first?
If two marbles roll off either side of a table at the same time but with different velocities, which marble hits the ground first?
When a cannon launches two projectiles with the same initial speed, which launched at 20 degrees and which at 70 degrees travels a greater horizontal distance?
When a cannon launches two projectiles with the same initial speed, which launched at 20 degrees and which at 70 degrees travels a greater horizontal distance?
Which projectile, launched at 20 degrees or 70 degrees, spends more time in the air?
Which projectile, launched at 20 degrees or 70 degrees, spends more time in the air?
For a projectile launched horizontally, what happens to the horizontal component of its velocity?
For a projectile launched horizontally, what happens to the horizontal component of its velocity?
When a golf ball reaches its maximum altitude, what is its velocity?
When a golf ball reaches its maximum altitude, what is its velocity?
If you want to cross a river in a boat in the least amount of time, what should you do?
If you want to cross a river in a boat in the least amount of time, what should you do?
In the absence of air resistance, at what launch angle should a cannon be aimed to reach the greatest range?
In the absence of air resistance, at what launch angle should a cannon be aimed to reach the greatest range?
When you throw a tennis ball to a friend, who catches it at the same height, how does the time to reach maximum altitude compare to total time in air?
When you throw a tennis ball to a friend, who catches it at the same height, how does the time to reach maximum altitude compare to total time in air?
If the net force on an object is zero, what does that imply?
If the net force on an object is zero, what does that imply?
If you apply the same force to a car and a truck, where the truck has twice the mass of the car, what can be said about their accelerations?
If you apply the same force to a car and a truck, where the truck has twice the mass of the car, what can be said about their accelerations?
If you push a heavy object with an angle, how does the normal force compare to the weight force on the object?
If you push a heavy object with an angle, how does the normal force compare to the weight force on the object?
What happens when a 25,000 kg truck collides with a 2,500 kg car in terms of the forces exerted?
What happens when a 25,000 kg truck collides with a 2,500 kg car in terms of the forces exerted?
Comparing work against gravity and power used, which twin did more work after taking the stairs when one took 30s and the other took 15s?
Comparing work against gravity and power used, which twin did more work after taking the stairs when one took 30s and the other took 15s?
What does the prefix giga- mean?
What does the prefix giga- mean?
What can unit analysis of an equation tell you?
What can unit analysis of an equation tell you?
What does a scalar quantity have?
What does a scalar quantity have?
What does a vector quantity have?
What does a vector quantity have?
Distance is to displacement as speed is to what?
Distance is to displacement as speed is to what?
An acceleration may result from what?
An acceleration may result from what?
When an object is thrown straight upward, what is true at its maximum height?
When an object is thrown straight upward, what is true at its maximum height?
In a constant linear acceleration scenario, the velocity time graph is described as what?
In a constant linear acceleration scenario, the velocity time graph is described as what?
What type of object does free fall motion apply to?
What type of object does free fall motion apply to?
What does a unit vector have?
What does a unit vector have?
What is the force required to keep a rocket ship moving at a constant velocity in deep space?
What is the force required to keep a rocket ship moving at a constant velocity in deep space?
What is the relationship between the acceleration of an object and net force and mass?
What is the relationship between the acceleration of an object and net force and mass?
What can be said about the action-reaction forces in Newton's third law?
What can be said about the action-reaction forces in Newton's third law?
What can be said about the coefficient of kinetic friction?
What can be said about the coefficient of kinetic friction?
What happens when a pitcher throws a fastball and the catcher catches it?
What happens when a pitcher throws a fastball and the catcher catches it?
Which of the following is a scalar quantity?
Which of the following is a scalar quantity?
What does a change in gravitational potential energy depend on?
What does a change in gravitational potential energy depend on?
What can the reference point for gravitational potential energy be?
What can the reference point for gravitational potential energy be?
If a nonconservative force acts on an object and does work, what does that imply?
If a nonconservative force acts on an object and does work, what does that imply?
If two springs are identical except for their spring constants k2 > k1, what happens when the same force is applied?
If two springs are identical except for their spring constants k2 > k1, what happens when the same force is applied?
Which of the following is not a unit of power?
Which of the following is not a unit of power?
What does impulse have the same units as?
What does impulse have the same units as?
Impulse is equal to what?
Impulse is equal to what?
Study Notes
SI Units
- Base units in the SI system are length (meter), mass (kilogram), and time (seconds).
- Derived units examples: Newtons (force) and Liters (volume).
Significant Figures and Projectile Motion
- The measurement 300.0 m/s contains four significant figures.
- Two marbles rolling off a table will hit the ground at the same time, regardless of their initial velocities.
- Projectiles A (20 degrees) and B (70 degrees) launched with the same speed will travel the same horizontal distance but projectile B will spend more time in the air.
Projectile Motion Characteristics
- A horizontally launched projectile maintains a constant horizontal velocity.
- At maximum altitude, a thrown golf ball has horizontal velocity with no vertical speed.
- To minimize crossing time, a boat should travel straight across the river.
- For maximum range, launch angle should be 45 degrees.
- A thrown tennis ball reaches its maximum altitude in half the time it is in the air.
Newton's Laws and Forces
- An object with zero net force is at rest or moving at a constant velocity.
- When equal forces are applied to a car and a truck, the car with half the mass will accelerate twice as much.
- Normal force can be greater than the weight when an object is pushed at an angle.
Forces in Collisions
- During a collision between a 25,000 kg truck and a 2,500 kg car, the forces experienced by both vehicles are equal and opposite.
Work and Power
- Working against gravity, Twin B, who climbed faster, exerted more power while both twins did the same amount of work against gravity.
Units and Measurements
- The prefix "giga-" represents 10^9.
- Dimensional analysis checks if equations are dimensionally correct.
- A scalar quantity has only magnitude, while a vector has both magnitude and direction.
Motion and Acceleration
- Distance relates to displacement as speed relates to velocity.
- An object can accelerate by speeding up, slowing down, or changing direction.
- A thrown object will have zero velocity at its maximum height.
- A velocity vs. time graph for constant linear acceleration is a straight line.
Mechanical Energy
- Free fall applies to objects dropped from rest or thrown vertically either upward or downward.
- A unit vector has both magnitude and direction.
- No force is needed to maintain constant velocity in deep space due to lack of resistance.
- Acceleration depends on the net force applied and is inversely proportional to mass.
Newton's Third Law
- Action-reaction forces act on different objects, maintaining conservation principles in physics.
Friction and Energy
- Kinetic friction is generally less than static friction.
- A pitcher throwing a fastball does negative work when caught.
- Work and kinetic energy are scalar quantities.
Potential Energy
- Changes in gravitational potential energy depend solely on initial and final positions.
- Gravitational potential energy reference points can be set at zero, negative, or positive values.
- Nonconservative forces causing work imply that mechanical energy is not conserved.
Springs and Power Units
- Identical springs with different spring constants will stretch differently under the same force.
- Watts x seconds is not a valid unit of power.
Impulse and Momentum
- Impulse shares units with momentum and is equivalent to the change in momentum.
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Test your understanding of fundamental physics concepts with these flashcards. From SI units to significant figures, this quiz challenges your knowledge on essential topics in physics. Perfect for students looking to reinforce their learning!
