19.1
What two things are needed to describe motion?
Reference point and direction
What is the push or pull of an object?
Force
Which of Newton's laws is also referred to as the law of inertia?
Law no# 1
If Tommy runs 5 miles in 25 minutes, what is his average speed in miles per minute?
0.2 m/m
Which type of force initiates a movement?
Action force
What is the total length of a path considered?
Distance
What type of force is a bat hitting a baseball?
Contact force
What can alter a force even if it is balanced?
Acceleration
If an object has a mass of 25 kg and we apply 100 newtons worth of force to the object, what would be the rate of acceleration?
4 n/kg
When two objects exert forces on one another, they are called what?
Force pairs
What is the formula to calculate speed?
S = D/T (Speed = distance/time)
What type of force is gravity?
Noncontact force
What is the formula for acceleration?
A = F/M (Acceleration = Force/Mass)
If one train leaves New York and travels to Chicago and travels 100 mph, how long would it take for the train to arrive if the distance is 1000 miles?
10 hours
What is the difference between the starting point and the furthest point traveled called?
Displacement
What is speed plus direction called?
Velocity
What is a contact force that resists the sliding motion between two surfaces that are touching
Frcition
This states that the acceleration of an object is equal to the net force exerted on the object divided by the object’s mass.
Newton's second law.
How much force must be applied to an object that weighs 5kg to get it to accelerate to 20 kg/m?
100 newtons
This is the case when the total net force between two objects is zero.
Balanced forces
What is the measure of how quickly an object’s velocity changes?
When an astronaut goes into space, what changes his or her weight or mass?
Weight
When one object exerts a force on a second object, the second object exerts a force of the same size but in the opposite direction of the first object.
Newton's third law.
If a snake chases Mr. Auvil at 30 feet per second, how fast would he have to run to get away from it?
He wouldn't; he would have a heart attack and die on the spot.
What was yesterday in Major League Baseball?
Jackie Robinson day