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The law of universal gravitation states that any two objects in the universe that have mass, without exception,
attract each other
According to the law of conservation of momentum, when two objects collide in the absence of outside forces
the objects have the same momentum before and after they collide
According to Newton's third law of motion, when a hammer strikes and exerts force on a nail, the nail
exerts an equal and oppostie force on the hammer
Which of the following is an example or rolling friction?
between your bike tires and the road as you ride
Which of the following is an example of increasing friction intentionally?
throwing sand on an icy driveway
When the only force acting on a falling object is AIR RESISTANCE, the object is said to be in free fall. T or F
F - when the only force acting on a falling object is GRAVITY
According to Newton's second law of motion, WEIGHT depends on an object's mass and the net force acting on the object. T or F
F - ACCELERATION
Friction depends on the types of surfeaces involved and how HARD the surfaces push together. T or F
The overall force on an object after all the forces are added together is called the _______ force.
One _________ is the force required to accelerate 1 kilogram of mass at 1 meter per second per second.
The force of gravity between you and the Earth is greater than the force of gravity between you and a car because Earth has more _____ than the car.
According to Newton's third law of motion, the strength of a reaction force is _______ the strength of the action force.
The force of gravity is responsible for continuously changing the ______ in which a satellite moves.
Wet pavement is more slippery than dry pavement because the force needed to overcome ________ friction is less than the force needed to overcome sliding friction
As the distance between two object's decreases, the gravitational force between them ___________.
If the action force of a bat striking a ball accerlerates the ball in one direction, the reaction force accelerates the bat in the _________ direction.
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