Kinematics
A velocity–time graph is a horizontal line above the axis. Describe the motion.
What is a constant positive velocity/zero acceleration?
A box slides at constant velocity across a rough surface. What must be true about the net force and friction?
What is Net force = 0, friction equals applied force?
A system has only conservative forces. What must be true about total mechanical energy?
What is it is conserved?
A truck and car move at the same speed. Which has greater momentum?
What is the truck (greater mass)?
What physical quantity is the slope of a velocity–time graph?
What is acceleration?
An object’s velocity changes from +10 m/s to −10 m/s in 4 s. What is its acceleration?
What is -5 m/s2?
A 5 kg object experiences two horizontal forces: 15 N right and 5 N left. What is acceleration?
What is 2 m/s² right?
An object speeds up while moving horizontally. What must be true about work done on it?
What is net work is positive?
A force acts for a longer time but with the same magnitude. How does impulse change?
What is impulse increases?
If mass doubles and net force stays constant, how does acceleration change?
What is it halves?
Two objects are dropped from rest; one is thrown downward with initial speed. After 2 s, how do their accelerations and velocity differences compare?
What is same acceleration, thrown object always has greater speed by initial difference?
A hanging mass is attached to a string. If it accelerates downward, how does tension compare to weight?
What is tension < weight?
A ball is thrown upward. Compare kinetic and potential energy at half the maximum height.
What is KE = PE?
Two objects collide and stick. What conservation law applies and what happens to kinetic energy?
What is momentum conserved, KE decreases?
A projectile has zero vertical velocity at the top. Is acceleration zero? Explain.
A position–time graph is curved upward (concave up). What does this indicate about velocity and acceleration?
What is Velocity increasing, acceleration positive?
Two blocks in contact are pushed together. How does the force one block exerts on the other compare to the reverse force?
What is equal in magnitude, opposite direction?
A force acts at an angle θ to displacement. How does this affect work?
What is only the parallel component contributes?
A ball hits a wall and bounces back with the same speed. Another ball hits the wall at the same speed and stops. How do the change in momentums compare?
What is the bounced ball has a greater change in momentum?
An object moves in a circle at constant speed. Is it accelerating? Why?
What is yes, since direction is changing, it is experiencing centripetal acceleration?
A ball is launched horizontally with a speed of 15 m/s from a cliff that is 45 m above the ground. Determine the range.
What is Δx = 45.46 m?
A block of unknown mass is at rest on an inclined plane that is at an angle of 22°. Determine the coefficient of static friction.
What is μ = 0.40?
A block slides down a frictionless ramp, then across a rough surface and stops. Compare energy transformations in both regions.
What is ramp: PE → KE conserved, rough surface: KE → thermal and is not conserved?
A bumper car of mass 500 kg hits another of mass 650 kg that is at rest. If the 500-kg car rebounds at 3 m/s and the 650-kg moves forward at 8 m/s, what velocity was the 500-kg originally traveling at?
What is vi = 7.4 m/s?
A system loses mechanical energy but momentum is conserved. What kind of interaction likely occurred?
What is an inelastic (sticky) collision?