ALL- This is an objects inital velocity subtracted from its final velocity and divided by time.
What is acceleration?
100
ALL- This is the tendancy of a stationary object to resist being put into motion.
What is INERTIA?
100
ALL- This force is the reason a cars brakes are less effective on a wet road than a dry road.
What is FRICTION?
100
ALL- This simple machine is a member of the lever family whose mechanical advantage depends on its number of ropes.
What is the PULLEY?
100
FIRST ANSWER ONLY!
This SI Base unit is defined as 1 Newton x 1 meter per second.
What is the WATT? 1 joule = 1 Newton x 1 meter; 1 watt = 1 joule / 1 second
200
ALL- This is the unit used to express the quantity that can be solved as distance/time
What is meters per second OR meters/second OR m/s? (Solving for VELOCITY)
200
ALL- An object is moving in a straight line at a constant speed. This is what will happen if no outside force acts on the object. (speed will _______, direction will _____)
What is The speed and direction of the object will not change?
200
ALL- Amy is jumping rope. This of Newton's laws best describes why she is able to get her body off the ground when she pushes downward with her feet.
What is Newton's Third Law of the Action-Reaction Law?
200
FIRST ANSWER ONLY!
A see-saw is an example of this class of lever, which places the fulcrum in the middle between the effort force and resistance force (load).
What is a 1st class lever?
200
FIRST ANSWER ONLY!
If a kayak is paddled a distance of 40 meters in 20 seconds with a force of 200 N, this is the power.
What is 400 watts?
Work = force x distance = 200 N x 40 m = 8000 Joules
Power = work / time = 8000 J / 20 s = 400 watts
300
ALL- This is the velocity of a tennis ball that travels 90 meters in 5 seconds.
What is 18 m/s?
300
ALL- Karen and Justine are each trying to move a box across the floor. The boxes the same size and shape but Karens box has twice the mass of Justines. If Justine must apply 35 N of force to put her box into motion, this is the force Karen must apply to move her box.
What is 70 Newtons?
300
FIRST ANSWER ONLY!
OF the following variables, this is the only one that affects the oscillation period of a pendulum in simple harmonic motion: length of string, mass of plumb, and angle of swing.
What is the length of the string?
300
ALL- Gina wants to create a device that sends her clothes directly to the washing machine in the basement without her having to walk down the stairs. This simple machine would be best for this work.
What is an Inclined Plane?
300
ALL- Tyrese is trying to move a large rock. He applies a force of 75 Newtons but is still unable to budge the rock. This is how much work has Tyrese done.
What is no work? (or 0 joules)
w = f x d = 75 N x 0 m = 0 joules
400
FIRST ANSWER ONLY!
A car's velocity changes from 0 m/s to 40 m/s in 5 seconds. What is the average acceleration of the car?
What is 8 meters per second squared?
400
FIRST ANSWER ONLY!
How big a force does it take to give a 50 kg object an acceleration of 40 meters per second squared?
What is 2000 Newtons? (F = m x a; F = 40 m/s2 x 50kg)
400
FIRST ANSWER ONLY!
This is the mechanical advantage of a lever that has an input arm of 4 meters and an output arm of 0.8 meters.
What is 5?
400
FIRST ANSWER ONLY!
The wheelbarrow is an example of this class of lever, in which the load is in the middle between the effort force (handles) and fulcrum (wheel)
What is 2nd class?
400
ALL- The motor of a Ferrari is more powerful than that of a smart car. Which of the following must be true of the Farrari's motor: a. it can do work more quickly b. it can operate for a longer time c. it can store more potential energy
What is a. it can do work more quickly? (Power = work/time)
500
ALL- If a graph that relates speed (y-axis) to time (x-axis), the slope of a line that represents zer acceleration will be: a. verticle b. horizontal c. increasing steadily d. none of these
What is b. horizontal?
500
ALL- A 70 kg skier leaves a ski jump at a velocity of 14m/s. This is the skier's momentum at that instant.
What is 980 N x s? (or 980 kg x m/s)
500
ALL: An object with a mass of 50 kg accelerates from rest to a final velocity of 50 m/s in 10 seconds. What force was necessary to put the object into motion?
What is 250 N? (Acceleration = Final Velocity - Initial Velocity / Time = 50 m/s / 10 s = 5 m/s2; F = m x a = 50 kg x 5 m/s 2 = 250 N)
500
ALL- These are the six types of simple machines.
What are the lever, pulley, wheel & axle, inclined plane, wedge, and screw?
500
FIRST ANSWER ONLY!
This is the power required to carry a 35 N package a vertical distance of 18 m if the work on the package is accomplished in 30 s.
What is 21 Watts? ( W = f x d = 35 N x 18 m = 630 j), (P = W / t = 630 j / 30 s = 21 Watts