Kinematics
Displacement definition
A. Total distance divided by time
B. Change in position with direction
C. Displacement divided by time
D. Change in velocity over time
What is B?
What is Change in position over direction?
A 80 kg skydiver is free falling at a constant velocity of 19 m/s.The total net force acted on her is
What is 0 N?
A measure of the force that can cause an object to rotate about an axis.
What is Torque?
The unit of energy
What is a Joule?
A 60 cm rope is tied to the handle of a bucket which is then whirled in a vertical circle. The mass of the bucket is 3 kg. At its lowest point, the tension in the rope is 50 N. The speed of the bucket is
What is 2 m/s?
Speed definition
What is distance over time?
A force of 8 Newton’s is applied to a crate so that it moves at a constant velocity of 1.5 m/s. The magnitude of the frictional force is
What is 8 N?
In uniform circular motion, the net force is always directed ___________
What is to the center of the circle?
Which of the following statements is true regarding a rider in a roller coaster cart moving with a constant speed through a loop?
A. The sum of all forces is zero
B. Gravity is the only force doing work on the rider
C. The rider is accelerating
D. There are two forces acting on the rider, but neither does work on the rider
What is C?
What is the rider is accelerating?
A frictionless inclined plane of length 20 m has a maximum vertical height of 5 m. If an object of mass 2 kg is placed on the plane. The net force is
What is 5 N?
The slope of a position vs time graph can be used to find
What is Velocity?
Ben launches has a catapult that changes the velocity of a ball with a mass of 2kg from 0 to 10 m/s in one second. The average force that is exerted on the ball is
What is 20 N?
A car moves around a circular path of radius 100m at a velocity of 20ms. The coefficient of friction between the car and the road is most nearly
What is 0.4?
62.5 J
A block with a mass of 20 kg is attached to a spring with a force constant k = 50 N/m. The magnitude of the acceleration of the block when the spring is stretched 4 m from its equilibrium position is
What is 10 m/s?
The slope of a velocity vs time graph can be used to find
What is Acceleration?
A 31-kg mass is accelerated by a net force of 81 N. The acceleration is
What is 2.6 m/s^2?
A 250g ball is being swung faster and faster in a horizontal circle. When the speed reaches 15ms, the tension (T) is 500N and the string breaks. The radius r of the circle is
What is 11.25cm?
A bullet with mass m = 10 g strikes a pendulum bob with mass M = 1.0 kg horizontally with a speed u and becomes embedded in the bob. The bob is initially at rest and is suspended by a stiff rod of length L = 10 cm and of negligible mass. The minimum speed u in meters per second caused the bob to execute a complete vertical circle was
What is 200 m/s?
A block of mass m slides from rest down an inclined plane of length s and height h. If F is the magnitude of the force of kinetic friction acting on the block as it slides, then the kinetic energy of the block when it reaches the bottom of the incline will be equal to
What is mgh - Fs?
A golf ball accelerates off a tee at 15m/s2, changing its velocity from 0m/s to 50 m/s down the fairway. The time it took to accelerate is most nearly
3.3 seconds
A 70 kg acrobat hangs from a bar, motionless, that is attached to the ceiling by two ropes. Find the tension in each rope
What is 343.35 N?
A 1.6kg ball is attached to a 1.8m string and is swinging in circular motion horizontally at the string's full length. If the string can withstand a tension force of 87N, the maximum speed the ball can travel without the string breaking is
What is 9.9 m/s?
Hans Full is pulling on a rope to drag his backpack to school across the ice. He pulls upwards and rightwards with a force of 22.9 Newtons at an angle of 35 degrees above the horizontal to drag his backpack a horizontal distance of 129 meters to the right. Determine the work (in Joules) done upon the backpack
What is 2.42 x 10^3 J?
If the distance between two point particles is doubled, then the gravitational force between them
What is it decreases by a factor of 4?