Questions and Answers
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.
Newtons and Liters
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?
Signup and view all the answers
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?
Signup and view all the answers
Which projectile, launched at 20 degrees or 70 degrees, spends more time in the air?
Signup and view all the answers
For a projectile launched horizontally, what happens to the horizontal component of its velocity?
Signup and view all the answers
When a golf ball reaches its maximum altitude, what is its velocity?
Signup and view all the answers
If you want to cross a river in a boat in the least amount of time, what should you do?
Signup and view all the answers
In the absence of air resistance, at what launch angle should a cannon be aimed to reach the greatest range?
Signup and view all the answers
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?
Signup and view all the answers
If the net force on an object is zero, what does that imply?
Signup and view all the answers
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?
Signup and view all the answers
If you push a heavy object with an angle, how does the normal force compare to the weight force on the object?
Signup and view all the answers
What happens when a 25,000 kg truck collides with a 2,500 kg car in terms of the forces exerted?
Signup and view all the answers
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?
Signup and view all the answers
What does the prefix giga- mean?
Signup and view all the answers
What can unit analysis of an equation tell you?
Signup and view all the answers
What does a scalar quantity have?
Signup and view all the answers
What does a vector quantity have?
Signup and view all the answers
Distance is to displacement as speed is to what?
Signup and view all the answers
An acceleration may result from what?
Signup and view all the answers
When an object is thrown straight upward, what is true at its maximum height?
Signup and view all the answers
In a constant linear acceleration scenario, the velocity time graph is described as what?
Signup and view all the answers
What type of object does free fall motion apply to?
Signup and view all the answers
What does a unit vector have?
Signup and view all the answers
What is the force required to keep a rocket ship moving at a constant velocity in deep space?
Signup and view all the answers
What is the relationship between the acceleration of an object and net force and mass?
Signup and view all the answers
What can be said about the action-reaction forces in Newton's third law?
Signup and view all the answers
What can be said about the coefficient of kinetic friction?
Signup and view all the answers
What happens when a pitcher throws a fastball and the catcher catches it?
Signup and view all the answers
Which of the following is a scalar quantity?
Signup and view all the answers
What does a change in gravitational potential energy depend on?
Signup and view all the answers
What can the reference point for gravitational potential energy be?
Signup and view all the answers
If a nonconservative force acts on an object and does work, what does that imply?
Signup and view all the answers
If two springs are identical except for their spring constants k2 > k1, what happens when the same force is applied?
Signup and view all the answers
Which of the following is not a unit of power?
Signup and view all the answers
What does impulse have the same units as?
Signup and view all the answers
Impulse is equal to what?
Signup and view all the answers
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.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
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!