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Gravity
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Law of Inertia
Objects at rest stay at rest; objects in motion stay in motion unless acted by another force
Inertia
The resistance of an object to move
After a bullet is fired into frictionless space, what is the amount of force needed to keep it going?
No force is needed
One object has twice as much mass as another object. What do we know about the first object?
The object has twice the inertia
Compared to its weight on Earth, a 50-kg object on the moon will weigh?
Less than 50 kg
The force required to maintain an object at a constant speed in free space is equal to what?
Zero
If an object following a straight-line path at constant speed, what do you know about the acceleration of that object?
Accelerates in the same direction as the force.
What is Friction? How can you calculate friction?
A force that opposes Friction; opposes the applied force F=ma.
What would happen if the force of gravity suddenly stopped acting on the planets?
They would move in a straight line tangent to its orbit.
A 50-N force and a 75-N force act on an object in opposite directions. What is the net force on the object?
25 N (magnitude depends on the direction of the strongest force)
What is Equilibrium?
All forces are equal.
A girl whose weight is 400 N hangs from the middle of a bar supported by two vertical strands of rope. What is the tension in each strand?
200 N
How can you calculate Weight? As a vector how is it represented?
Fw= mg downward
Which has more mass, a 2 kilogram of feathers or a 2 kilogram of iron?
Neither; they have the same mass
An object weighs 60 N on Earth. A second object weighs 60 N on the moon. Which has the greater mass?
Object on the moon.
What is acceleration? How can it be calculated using Newton's 2nd Law?
Change in velocity. a = Fnet/m
State the two relationships acceleration has when dealing with Newton's Laws?
1. acceleration is proportional to the Force 2. Acceleration is inversely proportional to the force
What is terminal velocity?
Force of gravity (weight) equal the force of air resistance (friction) in Freefalling objects.
A 100-kg brick and a 10-kg book are dropped in a vacuum. The force of gravity on the 100-kg brick is
The same as the 10 kg brick.
Gravity on earth and on the moon are
different. the moon's gravity is much less
Suppose the force of friction on a sliding object is 50 N. What is the force required to maintain a constant velocity?
Fapp = 50 N
A box is dragged without acceleration in a straight-line path across a level surface by a force of 45 N. What is the frictional force between the box and the surface?
45 N
Whenever an object exerts a force on another object, the second object exerts a force of the same magnitude, but in the opposite direction to that of the first object.
True
A high school student hits a wall with a fist. What are the forces that acting in this example?
Fist pushing the wall and the wall pushing fist.
According to Newton's 2nd Law, Forces always occur in _______________ ?
pairs
An cannon shoots an cannonball. Consider the action force to be the cannonball against the cannon. The reaction to this force is?
The cannon against the cannonball.
A person is attracted towards the center of Earth by a 500-N gravitational force. The force with which Earth is attracted toward the person is?
500 N
A large truck and a small car traveling at the same speed have a head-on collision. The vehicle to undergo the greater change in velocity will be?
Small car
What is Newton's third law?
For every action there is an opposite and equal reaction.
If you push off the ground with a force of 25 N when you jump upward, what force pushes Earth downward?
25 N
A pair of blocks, one 2 times as massive as the other, are connected by a compressed spring. When the spring is released, the blocks fly apart. Compared to the heavier block, how many times as fast does the lighter block accelerate?
Twice as fast
A person weighs 900 N. What is the mass of the person? How do you know?
90 kgs. divide by gravity
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