Veritable Vocabulary
Notably Newton
Go Figure (in Newtons)
"4-ces"
Hodge Podge
100
Friction that opposes the initiation of motion
What is STATIC friction
100
Newton's 1st Law of Motion tells us an object will not change velocity until acted on by an outside force. In space, there is almost no air, so there is virtually no friction. If an astronaut throws a ball in space with an initial velocity of 3 meters/second to the west, what will the ball's velocity be in a year? (assume there are no nearby planets)
What is 3 METERS/Second to the west
100
A father is trying to teach his child to ice skate. As the child stands still, the father pushes him forward with an acceleration of 2 meters/second squared north. If the child's mass is 20 KG, what is the force with which the father is pushing? (Since they're on ice, assume you can ignore friction.) Total force = Mass * Acceleration
What is 40 NEWTONS
100
A child pushes against a large doghouse, trying to move it. The doghouse remains stubbornly unmoved. What exerts the equal & opposite force which Newton's 3rd law of Motion says MUST happen in response to the child's push? Complete the sentence...The equal & opposite force is exerted by the ____________ on the ______________.
What is the DOGHOUSE on the CHILD
100
The reason Aristotle made so many mistakes when describing motion is that he did not know about the existence of ___________.
What is FRICTION
200
A force that opposes motion, resulting from the contact of two surfaces
What is FRICTION
200
Applying Newton's 1st law...a boy is running north with a beanbag in his hands. He passes a tree & at the moment he is beside the tree, he drops the beanbag. Will the beanbag land next to the tree? If not, will it be north or south of the tree?
What is NORTH of the tree.
200
In order to get a 15-KG object moving to the west, a force of more than 25 Newtons must be exerted. Once it's moving, however, a force of only 20 Newtons accelerates the object at 0.1 Meters/second squared to the west. What is the force that STATIC friction can exert on the object?
What is 25 NEWTONS
200
In a baseball game, a player catches a fast-moving ball. The ball stops in the player's hand. What evidence tells you that the player exerted a force on the ball? a) Newton's 2nd Law + ball's velocity change b) Newton's 3rd Law + ball's velocity change c) None of the above
What is B...
200
The units on force are composed of a mass unit times a distance unit divided by a time unit squared. The standard unit for force is kg*m/Second squared---also called the _____________.
What is the NEWTON.
300
The tendency of an object to resist changes in its velocity
What is INERTIA
300
Suppose the situation (in the above question) is now changed. The boy is running, but now his friend stands beside the tree with the beanbag. As the boy passes, he barely taps the beanbag, causing it to fall out of his friend's hands. Will the beanbag land next to the tree? If not, will it be north or south of the tree?
What is NEXT TO the tree.
300
In order to get a 15-KG object moving to the west, a force of more than 25 Newtons must be exerted. Once it's moving, however, a force of only 20 Newtons accelerates the object at 0.1 meters/second squared to the west. What is the force of KINETIC friction? hints: step 1 Total force = m*a step 2 Total force = Applied force - kinetic force
What is 18.5 Newtons --------------------------------------------- total force: 15*0.1=1.5 total force = applied - kinetic (1.5 = 20 - x) x = 18.5
300
A man leans up against a wall with a force of 20 Newtons to the east. What is the force exerted by the wall on the man?
What is 20 Newtons WEST (equal & opposite the man's force)
300
When you fire a gun, it 'kicks' back towards you. That 'kick' is the result of Newton's ___________ Law of Motion.
What is 3rd.
400
Friction that opposes motion once the motion has already started
What is KINETIC friction
400
Applying Newton's 1st Law...a busy shopper is driving down the road & has many boxes piled on the back seat of her car (evidence of shopping activity). Suddenly, the shopper must hit the brakes to avoid a collision. Will the boxes be slammed farther back into the back seat, or will they slam into the front seat where the driver can feel them?
What is SLAM into the FRONT seat.
400
Static friction can exert a force of up to 700 Newtons on a 500-KG box of bricks. The kinetic frictional force is only 220 Newtons. How many Newtons of force must a worker exert to get the box moving?
What is GREATER THAN 700 Newtons of force to get the box moving.
400
In order to shove a rock out of the way, a gardener gets it moving by exerting just slightly more than 100 Newtons of force. To keep it moving at a constant velocity eastward, however, the gardener needs only to exert a 45-Newton force to the east. What is the STATIC frictional force between the rock and the ground?
What is 100 Newtons
400
When multiple forces act on an object, forces in the same direction are __ (added/subtracted)___________ and forces in opposite directions are __(added/subtracted)________________.
What is same direction--ADDED opposite directions--SUBTRACTED
500
Which force is greater? kinetic friction OR static friction
What is STATIC friction
500
a) In order to slide a refrigerator across the floor, a man must exert an enormous amount of force. To get it moving, this man has to overcome what frictional force?_____________ b) Once it is moving, however, the man need not exert nearly as much force to keep it moving. Now the man only needs to overcome what frictional force?__________
What is a) STATIC b) KINETIC
500
Static friction can exert a force of up to 700 Newtons on a 500-KG box of bricks. The kinetic frictional force is only 220 Newtons. What force must the worker exert to accelerate the box at 0.1 Meters/second squared to the south? Hints: 1st: Total force = m*a 2nd: Total force = applied (the worker) - kinetic
What is 270 Newtons South ------------ 1) 500 * 0.1 = 50 Newtons 2) 50 = applied - 220 (applied = 270)
500
In order to shove a rock out of the way, the gardener gets it moving by exerting just slightly more than 100 Newtons of force. To keep it moving at a constant velocity eastward, however, the gardener needs only to exert a 45-Newton force to the east. What is the KINETIC frictional force between the rock and the ground?
What is 45 Newtons--enough force to overcome the kinetic frictional force, but no more; acceleration is zero.
500
Since friction always opposes motion, the frictional force will ALWAYS be __________________ from the force that is being used to cause motion.
What is SUBTRACTED
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