Position & Velocity
Tre sat 50 feet from Mrs. King's desk. Is that distance or displacement?
Distance it did not give a direction.
Are these objects in free fall yes or no?
1.) A textbook lying on a desk
2.) A textbook that has been tossed upward and has left the student’s hands but not yet touched any other object or surface
3.) A textbook that has been thrown downward from a tall cabinet
4.) A textbook held tightly by a running student
1.) No
2.) Yes
3.) Yes
4.) No
Ricky's puppy weighs 15 lb. Kirsten's puppy weighs 50 N. Whose puppy weighs more?
Ricky's puppy weighs more.
What forms of energy are found in the sun.
Nuclear energy , Thermal energy , Radiant energy , and Mechanical energy.
You shoot a 2.0 kg basketball toward the hoop with an initial total energy of 500 J(No air friction). When the ball reaches the top of its arc, what is its total energy?
Due to the law of energy conservation, the ball keeps its 500 J of total energy.
A car travels from point A to B in 3 hours and returns back to point A in 5 hours. Point A and B are 150 miles apart along a straight highway. What is the average speed of the car?
The average speed is 37.5 mph
Dom drops his ball a distance of 1 m on the surface of planet Zogg. June wants her ball to take twice as much time to fall as Dom's. What height should she drop it from? (gravity is stronger on the surface of Zogg than it is on Earth.)
She should drop it from 4m
The acceleration due to gravity at the surface of Mars is 38% of that on Earth. If a Mars rover has a mass of 950 kg on Earth, how much does it weigh on Mars?
The weight of the rover would be 3,500 N on Mars
A 30 kg boy sitting on a 10 kg go-kart wants to travel down a hill of height 10 m, starting from rest. What is the initial kinetic energy?
The initial velocity is 0, so the initial kinetic energy is also 0.
A 10 kg go-kart driven by a 30 kg boy starts from rest and rolls down a hill of height 10 m. What is the predicted speed of the boy and go-kart at the bottom of the hill?
The speed of the boy and go-kart at the bottom of the hill will be 14 m/s.
A plane starts at airport A and undergoes the following displacements before landing at airport B: d1 = (+14 km, +32 km) and d2 = (+18 km, −11 km). Next, the plane returns directly to airport A. What displacement does the plane undergo during the return trip?
The displacement from airport B back to A is (−32 km, −21 km).
A truck is traveling at 15m/s, and is accelerating with a constant acceleration of 5 m/s2. The truck is attempting to pass a car which is moving at a constant velocity of 30m/s. How far must the truck travel until it matches the car’s velocity?
It must travel 67.5 m
A 120 pound boy sits on a 20 pound stool with his feet above the floor. What is the net force of the boy on the stool?
The net force is 0 because the boy and the stool are in equilibrium.
A 1,000 kg car traveling 15.0 m/s brakes and comes to a stop after traveling 20.0 m. What is the car’s final kinetic energy?
At the end the car is not moving so its kinetic energy is 0.
Mason shoots a 5.0 kg basketball toward the hoop with an initial total energy of 500 J(No air friction on ball). When the ball is just about to hit the rim, what is its total energy?
The total energy is 500 J
The term vector is best described by...
A quantity that has a magnitude and a direction
A Ferrari is able to reach a speed of 134 miles per hour from 0mph in 11 seconds. Assuming constant acceleration how far would the Ferrari travel in this amount of time?
330 meters
Which of Newton’s three laws of motion best applies to this statement? "Now that the moving van was full, its driver had to apply more force to reach highway speed before the on-ramp ended."
Newton's 2nd law
An immersion water heater is rated at 1,000 W. If it is plugged into a 120 volt outlet, how much current does it draw?
It will draw 8.33 A of current.
A man applies 500 N of horizontal force to push a 100 kg wooden crate 20 m across a floor. What is the work that the man performs upon the crate over the 20 m distance?
The man performs 10,000 J of work upon the crate.
Shane moves to the right with a positive velocity of 5 m/s for 1 s, then to the left with a negative velocity of −5 m/s for 1 s. What is Shane’s displacement after 2 s?
0 m
A ball thrown upward on the Moon will take __________ time to return to the surface than it would on Earth.
More
Is the force F in Hooke’s law (F = −kx) the force applied to the spring by an outside object, such as your foot?
No, Hooke’s law calculates the force applied by a spring onto the object.
A 40 kg wheeled cart needs to be moved to the top of a platform that is 1.0 m high. How much power is required to pick up the cart and place it on the platform in 3.0 s?
130 W
At the front of Mrs. Greer's classroom there is a large bottle with hydrochloric acid, but she only needs to use a small amount at her bench. Mrs. Greer follows good handling procedures to transfer some HCl into a smaller bottle to take to her bench. What else should she do?
She should label the smaller bottle with all the information from the original bottle, such as the name of the substance and its various hazards and precautions.