Force
What is Force?
The strength or energy as an attribute of physical action or movement.
What is Motion?
The action or process of moving or being moved.
What is Newton's First Law?
An object at rest will stay at rest unless acted upon by an another object.
What is Newton's Second Law?
The acceleration of an object is dependent upon two variables.
What is Newton's Third Law?
When an object acts upon another object there is an equal but opposite force on the first object.
What is the unit of measure for force?
Newton
The two measurements necessary for calculating average speed are?
Distance and time
Newton's First Law of Motion is also called?
Law of Inertia
What is a force?
Any interaction that, when unopposed, will change the motion of an object.
When a heavy football player and a light one run into each other, who exerts more force?
They are equal.
What is the sum of all forces acting on an object called?
Net Force
Which of the following is not a vector quantity?
Speed
What is inertia?
Tendency of an object to resist any change in its motion.
You are standing in an elevator as it starts to move downward, accelerating for a moment. Which of these is true at that moment?
The net force on you changes from zero to downward as the elevator begins accelerating.
When you hold an apple above your head, how many force pairs act on the apple?
2
What does Newton's Second Law of Motion state?
F = ma
The average speed of a horse that gallops a distance of 10 kilometers in a time of 30 minutes is?
20 km/h.
What kind of objects have inertia?
All objects with mass.
You are lying on your back on the slope of a grassy hill, watching the clouds go by overhead. Which is the best statement about the force of friction exerted on you by the ground in this situation?
A force of static friction pointing "up the hill", parallel to the surface of the hill, is applied to you by the ground.
Suppose two carts, one twice as massive as the other, fly apart when the compressed spring that joins them is released. How fast does the heavier cart roll compared with the lighter cart?
Half as fast.
In the equation F = ma, what does m represent?
Force
What is the acceleration of a car that maintains a constant velocity of 100 km/hr for 10 seconds?
0
An object in motion will stay in what kind of motion as long as the net forces acting on it are zero?
Constant motion in a straight line.
Consider a car driving at a constant speed on a level road. Which of the following is an action-reaction pair (from Newton's third law)?
The normal force exerted on the car by the road and the downward force exerted on the road by the car.
A bus hits a bug and the bug splatters on the windshield, which force is greater?
They're the same.