Kinematics
What does the slope of a velocity vs time represent?
What is acceleration
What does the work-energy theorem state?
What is, when a constant external force acts on an object in the same direction of its displacement, positive work is done
Elevator: Earth exerts a _____ force on a person and the scale exerts a _____ force on a person.
What is dowward/upward
What does Newton’s first law state?
What is an object at rest will stay at rest and an object in motion will stay in motion unless acted upon by an external force
What is always conserved in collisions?
What is momentum (due to law of conservation of momentum: in a closed, isolated system, momentum is conserved).
What is the magnitude of acceleration due to gravity
What is 9.81 m/s^2 or 10 m/s^2
What is power?
What is the rate at which we do work, or the rate at which energy is transferred or converted
What are the two types of friction?
What are static (rolling/non-rolling) friction and Kinetic friction (sliding friction between two objects)
What does Newton’s second law state?
What is when a nonzero force is applied to an object, it causes acceleration (F=ma)
In which type of collision is kinetic energy conserved?
What are elastic collisions
What type of path do projectiles follow?
What is a parabolic path
If no work is done, the total mechanical energy remains the ____. What is the equation related to this?
What is same and Ei=Ef
What is a restoring force?
What is a force that attempts to bring an object to its equilibrium position
What does Newton’s third law state?
What is if object one exerts a force on object two, then object two exerts a force back on object one, equal in strength but opposite in direction
What happens to mass in a closed system?
What is, it does not lose or gain mass
A car starts from rest and accelerates uniformly at 2.5m/s2 along a straight road. After reaching a speed of 25m/s, the driver applies the brakes, and the car comes to a stop in 5.0 seconds.
How far does car travel while accelerating to 25m/s
What is 125 meters
A 2.0 kg block is released from rest at the top of a frictionless ramp 5.0 meters high. At the bottom of the ramp, it compresses a horizontal spring with a spring constant k=800N/m
How far does the spring compress when the block comes to rest?
What is 0.50m
A 5.0kg box is pulled across a horizontal surface by a rope that applies a force of 30N at an angle of 37o above the horizontal. The coefficient of kinetic friction between the box and surface is 0.20.
What is the net force on the box?
What is 17.57N
What is the amount of force the wall exerts on a student?
What is 200N
A 2.0kg object moving at 4.0m/s to the right collides inelastically with a 1.0kg object moving at 2.0m/s to the left. After the collision, the two objects stick together.
What is the net momentum of the system before the collision?
What is 6.0kgm/s to the right
A car starts from rest and accelerates uniformly at 2.5m/s2 along a straight road. After reaching a speed of 25m/s, the driver applies the brakes, and the car comes to a stop in 5.0 seconds.
How far does the car travel while breaking?
What is 62.5 meters
A 2.0 kg block is released from rest at the top of a frictionless ramp 5.0 meters high. At the bottom of the ramp, it compresses a horizontal spring with a spring constant k=800N/m
What is the speed of the block just before it touches the spring?
What is 10.0m/s
A 5.0kg box is pulled across a horizontal surface by a rope that applies a force of 30N at an angle of 37o above the horizontal. The coefficient of kinetic friction between the box and surface is 0.20.
What is the acceleration of the box?
What is 3.51m/s2
What is, their body will keep moving and perhaps fly off the skateboard since the curb stops the board and not the student.
A 2.0kg object moving at 4.0m/s to the right collides inelastically with a 1.0kg object moving at 2.0m/s to the left. After the collision, the two objects stick together.
What is the velocity of the combined objects after the collision?
What is 2m/s to the right