Definitions
How you symbolize the change in height.
What is delta y?
A tennis ball is dropped from a cliff. A second tennis ball is thrown down from the cliff. Explain the acceleration of each ball.
They both fall with the same acceleration because they are in a free fall
This is the shape of the path of all projectiles.
What is parabolic?
If a tennis ball takes 4.5 sec to reach its peak, how long does it take to reach the other player?
What is 9 s?
More massive objects have a large gravitational force or weight. Why do heavier objects accelerate to the ground at the same rate as lighter ones?
A. Smaller objects have more inertia.
B. More massive objects have less inertia.
C. All objects have the same pull of gravity on them.
D. Heavier objects need a greater force to accelerate according to F=ma.
D. Heavier objects need a greater force to accelerate according to F=ma.
How do you symbolize the range of a projectile?
What is delta x?
A pen falls off my desk. It took 1.5 seconds to fall. What was the velocity of the pen just before it hit the ground?
-14.7 m/s
What is the velocity at the top of a projectile?
0 m/s
The initial horizontal velocity (vi in the x-direction) for a ball thrown horizontally off a cliff is 40 m/s. The ball stays in the air for 3 seconds. How far from the base of the cliff does it land?
What is 120 m?
Carlos is trying to impress his girlfriend with his strength. He was able to regularly lift a maximum of 100 kg on a flat bench. If he attempted this on an inclined plane for Jessica, what statement describes the likely outcome and explanation?
A. Carlos would be able to lift a greater weight because there would be a reduced force of gravity at an angle.
B. Carlos would have difficulty lifting 100 kg, even though gravity pulls less directly on the object at an angle, because the mass is still very heavy.
C. Carlos would be able to lift a greater weight because the force he exerts is perpendicular to the plane, but gravity is at an angle.
D. Carlos would impress Jessica because the tension force he exerts is perpendicular to the plane so the angle doesn't make a difference in net force.
B. Carlos would have difficulty lifting 100 kg, even though gravity pulls less directly on the object at an angle, because the
Displacement refers to how far out of place an object is and it is the object's overall change in position. Is displacement a vector or scalar quantity?
What is vector?
I get angry and throw a pen straight down to the floor. I throw it with an initial speed of 20 m/s. It took 0.2 seconds to fall. What is the velocity of the pen just before it hit the floor?
-21.96 m/s
A physics student who is curious about the trajectory of a paint ball stands with his gun horizontally and fires it off. The paint ball leaves the gun from a height of 3.5 m and lands on the ground 36.0 m away. How long was the ball in the air?
What is 0.85 s?
In equation form: Fg
= Gm1m2
/d2
Where G is the universal gravitational constant.
According to the law of falling bodies, all objects near the surface fall to the ground with the same acceleration regardless of mass.
Using the above equation and newton's second law, what three quantities determine the acceleration due to gravity for an object falling to earth?
The gravitational constant, mass of the earth and distance between the objects centers.
What is "the two-dimensional movement of an object through the air, following a curved path under the sole influence of gravity, with no other forces acting on it?"
What is projectile motion?
Consider the graph showing free fall. What statement BEST describes the forces acting on the object in free fall?
Net force is negative, downward.
What is the initial vertical velocity of a horizontal projectile?
What is 0?
A physics student who is curious about the trajectory of a paint ball stands with his gun horizontally and fires it off. The paint ball leaves the gun from a height of .75 m and lands on the ground 3.0 m away. What was the horizontal velocity?
What is 7.7 m/s?
During which part(s) of the rock’s fall did the rock experience unbalanced forces?
Parts 1 and 2
This velocity is constant throughout the projectile's path.
What is horizontal velocity?
A ball is dropped from a cliff. What is the acceleration?
-9.8 m/s2
If I throw a ball with a velocity of 20 m/s, at what velocity will I catch it?
20 m/s
Two planets orbit a star, as shown. If the planets are identical, which gravitational force is the strongest?
The force between the inner planet and the star.