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Properties of Force
Newton's Laws
Gravity
Special Forces
Calculator required
100
This force can only act on a moving object and acts in a direction opposite of its motion?
What is DRAG or KINETIC FRICTION? (Water or Air resistance are another name for drag)
100
According to Newton's 2nd Law, a greater net force acting on an object will produce a greater _____________.
What is acceleration? (because acceleration=net Force/mass
100
Besides Suns, Planets, and Moons, this also has gravity?
What is ANYTHING? (All objects with mass exert a force of gravity on all other objects with mass)
100
A heavy couch is easier to slide if its already moving, because _________ friction is less than _________ friction.
What is KINETIC and STATIC?
100
What acceleration does a 4kg mass experience if pushed with a force of 18N.
What is 4.5 m/s/s? (a=F/m)
200
This force is only as strong as the amount of fluid that an object displaces?
What is buoyant force?
200
According to Newton's 3rd Law, if I push another person who is twice my mass, they will push back on me with ____________ force.
What is THE SAME. (For every force exerted by an object, there is an equal and opposite force exerted on that object)
200
The force of gravity here on Earth often goes by another term. We call it ___________.
What is WEIGHT?
200
The coefficient of friction is a number used to describe ____________________.
What is the roughness of a surface?
200
This much force would be needed to slide a 6N box on a surface with a coefficient of friction equal to 0.25
What is 1.5N? (Friction = Coefficient x Normal Force)
300
Forces that are equal in strength but opposite in direction are described as ___________ forces.
What is BALANCED?
300
An empty wagon has half the mass as a full wagon. If the empty wagon is pushed with twice the force, its acceleration will be ______ times faster.
What is 4?
300
An object's weight in Newtons is always this many times larger than its mass in kilograms?
What is 9.8? (w=mg, and g=9.8)
300
An object in air weighs 9N, but in water only seems to weigh 3N. This is because the water pushes with a buoyant force equal to _____ N.
What is 6N?
300
What is the weight of an 80kg person on Earth?
What is 760N? (w=mg)
400
Two forces of 80N and 55N together can produce a net force as low as _________ and as great as __________.
What is 25N and 135N? (Forces can add together if in the same direction, or subtract if in opposite directions)
400
According to Newton's first law, an object with more mass is both more difficult to move and more difficult to stop because it has more ____________.
What is INERTIA?
400
If an object is taken to the Moon from Earth, its mass will be _____________ and its weight will be ____________.
What is THE SAME and LESS?
400
Without increasing your mass, you can increase your weight on Earth on doing this.
What is GETTING CLOSER TO THE CENTER OF EARTH or DROPPING IN ELEVATION?
400
This much force is needed to take a 1200kg car and accelerate it at 3m/s/s
What is 3600N? (F=ma)
500
An object that has balanced forces acting upon it can be either stationary or it can be moving if it's ___________ is constant.
What is VELOCITY? ( a constant velocity is zero acceleration)
500
When I pushed against the floor, or lean against a wall, the equal and opposite force that I experience is called a _____________ force.
What is NORMAL?
500
If the distance between two objects is doubled, then the force of gravity between them is only ________ as strong.
What is 1/4 or 25%?
500
The buoyant force on a cargo ship is increase when the boat is __________________.
What is LOADED WITH CARGO TO SINK LOWER IN THE WATER or SAILED INTO SALTWATER THAT IS MORE DENSE?
500
A brick weighs 8N on Earth and has this much mass.
What is 0.8kg? (m=w/g)