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Questions and Answers
What is the term for the resistance of an object to changes in its motion?
What is the term for the resistance of an object to changes in its motion?
- Friction
- Inertia (correct)
- Momentum
- Acceleration
What unit is used to label a force calculation?
What unit is used to label a force calculation?
- Pound
- Newton (correct)
- Pascal
- Joule
What is the highest speed an object can reach called?
What is the highest speed an object can reach called?
- Final velocity
- Terminal velocity (correct)
- Critical speed
- Constant speed
At what rate do falling objects accelerate due to Earth's gravity?
At what rate do falling objects accelerate due to Earth's gravity?
Which object has greater inertia if both are moving at 10 m/s?
Which object has greater inertia if both are moving at 10 m/s?
Which ball type had the highest initial velocity at 1 meter?
Which ball type had the highest initial velocity at 1 meter?
At 5 meters, which ball type showed the largest decrease in speed compared to its initial speed?
At 5 meters, which ball type showed the largest decrease in speed compared to its initial speed?
What was the average velocity of the Golf Ball at 3 meters?
What was the average velocity of the Golf Ball at 3 meters?
How did the Steel Ball’s speed change as it moved from 1 meter to 4 meters?
How did the Steel Ball’s speed change as it moved from 1 meter to 4 meters?
What was a key observation regarding the velocities of the Bowling and Golf balls as distance increased?
What was a key observation regarding the velocities of the Bowling and Golf balls as distance increased?
What is the velocity of Dane's Chrysler Pacifica if it travels 400.0 miles in 7.2 hours?
What is the velocity of Dane's Chrysler Pacifica if it travels 400.0 miles in 7.2 hours?
How far did Chantel's Ferrari Modena travel if it was moving at a speed of 99 mi/hr for 3.7 hours?
How far did Chantel's Ferrari Modena travel if it was moving at a speed of 99 mi/hr for 3.7 hours?
How long does it take a semi-truck traveling at 50.0 mi/hr to cover a distance of 387 miles?
How long does it take a semi-truck traveling at 50.0 mi/hr to cover a distance of 387 miles?
What was Joe's speed if he drove 500.0 miles in 11 hours?
What was Joe's speed if he drove 500.0 miles in 11 hours?
What is the acceleration of Peterson's Ducati motorcycle if it increases its velocity from 80.0 m/s to 100.0 m/s in 3.0 seconds?
What is the acceleration of Peterson's Ducati motorcycle if it increases its velocity from 80.0 m/s to 100.0 m/s in 3.0 seconds?
What happens to the speed of a rolling object as it moves further from the base of a ramp?
What happens to the speed of a rolling object as it moves further from the base of a ramp?
Which statement correctly describes Newton's 2nd Law?
Which statement correctly describes Newton's 2nd Law?
How long does it take to travel 5 meters at a speed of 3.2 m/s?
How long does it take to travel 5 meters at a speed of 3.2 m/s?
What is the force required to accelerate a 7 kg desk at 20 m/s²?
What is the force required to accelerate a 7 kg desk at 20 m/s²?
What is the mass of an object that is accelerated by a force of 90 N resulting in an acceleration of 1.5 m/s²?
What is the mass of an object that is accelerated by a force of 90 N resulting in an acceleration of 1.5 m/s²?
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Study Notes
Speed, Velocity and Acceleration
- Velocity is calculated by dividing distance by time. For example, a vehicle traveling 400 miles over 7.2 hours has a velocity of 56 miles per hour.
- Distance can be calculated by multiplying velocity and time. For example, traveling at 99 miles per hour for 3.7 hours results in a distance of 360 miles.
- Time can be calculated by dividing distance by velocity. For example, a semi-truck traveling 387 miles at 50 miles per hour takes 7.74 hours.
- Acceleration is calculated by dividing the change in velocity by time. For example, a motorcycle accelerating from 80 m/s to 100 m/s over 3 seconds experiences an acceleration of 6.7 m/s².
Newton's Laws of Motion
- Newton's 1st Law of Motion: An object at rest will stay at rest, and an object in motion will stay in motion at a constant velocity, unless acted upon by an unbalanced force.
- Newton's 2nd Law of Motion: The acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to its mass. Basically, more mass means the object is resistant to change in motion, meaning it will accelerate slower with the same force.
- Newton's 3rd Law of Motion: For every action, there is an equal and opposite reaction. This means that when you push off the ground to walk, you are also pushing the Earth forward, although the Earth's immense mass prevents any noticeable motion.
Gravity and Motion
- Earth's gravity causes objects to accelerate at a rate of 9.8 m/s².
- A rolling object travels faster the further away it gets from the base of a ramp because the ramp becomes taller, which allows it to gain momentum and accelerate further.
- Air resistance is assumed to be insignificant in this idealized scenario.
Data Analysis of Rolling Objects
- Bowling balls, golf balls and steel balls were observed rolling down a ramp at varying distances.
- Bowling balls and golf balls slowed down as the distance from the base of the ramp increased.
- Steel balls initially gained speed as they rolled down the ramp, but eventually slowed down as they continued to roll.
- The data suggests that different objects react differently to friction and gravity, especially over varying distances.
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