State Newton’s First Law of Motion State Newton’s Second Law of Motion Describe the motion of an object being acted upon by balanced forces

If the mass of an object stays constant, and the force on that object increases, what will happen to the acceleration of the object? If the force on an object stays constant, and the mass of that object increases, what will happen to the acceleration of the object? If the force on an object stays constant, what is the relationship between mass and acceleration?

What does the data on this graph represent? Explain how you know.

What units would correspond to each point on the line? Explain what is happening between 30 and 45 seconds.

What is the acceleration at 5 seconds?

What does the data on this graph represent? What units are associated with each point?

What is the speed at point A? What does the flat line represent?

A roller coaster is moving at 35 m/s at the bottom of a hill. Four seconds later it reaches the top of the hill moving at 10 m/s. What was the acceleration of the coaster? A swimmer speeds up from 0.9 m/s to 1.4 m/s during the last 25 seconds of a race. What is the acceleration of the swimmer? If a speeding train hits the brakes and it takes the train 25 seconds to go from 50 m/s to 15 m/s what was the acceleration?

A student quickly pulls a paper from underneath an inverted bottle. The bottle will ________________________ because _____________________________

Two of the forces involved are _____________________ & ___________________ Mass plays a role in this way: _______________________________________________

10 N7 N What direction will the block move & why? What will the block’s acceleration be? 10 Kg Describe the motion of an object that is being acted on by unbalanced forces. Be sure to use the term “net force”.

ANSWERS

State Newton’s First Law of Motion see page 48 of textbook State Newton’s Second Law of Motion see page 52 of textbook Describe the motion of an object being acted upon by balanced forces it doesn’t move

If the mass of an object stays constant, and the force on that object increases, what will happen to the acceleration of the object? It will increase If the force on an object stays constant, and the mass of that object increases, what will happen to the acceleration of the object? it will decrease If the force on an object stays constant, what is the relationship between mass and acceleration? Inverse (indirect) relationship

What does the data on this graph represent? Explain how you know. it represents acceleration: y-axis is speed & x-axis is time

What units would correspond to each point on the line? m/s/s Explain what is happening between 30 and 45 seconds. it represents constant speed

What is the acceleration at 5 seconds? 30 m/s divided by 5 seconds = 6 m/s/s

What does the data on this graph represent? speed What units are associated with each point? m/s

What is the speed at point A? 10 m divided by 6 sec = 1.67 m/s What does the flat line represent? No motion

A roller coaster is moving at 35 m/s at the bottom of a hill. Four seconds later it reaches the top of the hill moving at 10 m/s. What was the acceleration of the coaster? 10 m/s minus 35 m/s = -25 m/s divided by 4 seconds = m/s/s (deceleration) A swimmer speeds up from 0.9 m/s to 1.4 m/s during the last 25 seconds of a race. What is the acceleration of the swimmer? 1.4 m/s minus.9 m/s =.5 m/s divided by 25 seconds =.02 m/s/s If a speeding train hits the brakes and it takes the train 25 seconds to go from 50 m/s to 15 m/s what was the acceleration? 15 m/s minus 50 m/s = -35 m/s divided by 25 seconds = -1.4 m/s/s (deceleration)

A student quickly pulls a paper from underneath an inverted bottle. The bottle will stay in the same spot, but on the table itself because it has enough inertia (mass) to overcome the force of the paper moving underneath it. An object at rest will stay at rest unless acted on by an unbalanced (net) force.

Two of the forces involved are gravity (weight) & the force of the pull Mass plays a role in this way: mass gives the bottle enough inertia to overcome the paper’s force

10 N7 N What direction will the block move & why? To the right…net force is 10N minus 7N = 3N What will the block’s acceleration be? Force divided by mass = accel so… 3N divided by 10 Kg =.3 m/s/s 10 Kg Describe the motion of an object that is being acted on by unbalanced forces. Be sure to use the term “net force”. No net force so no movement