Newtons First Law
Finish the saying: Object in rest remain at ______. Objects in motion remain in _______. UNLESS acted upon by a force.
What is rest and motion?
A puck moves to the right at constant velocity on a nearly frictionless surface. What is the net force on the puck?
What is zero?
A 12.0 kg cart and a 24.0 kg cart experience the same net force. How do their acceleration magnitudes compare?
What is 12 kg cart has twice the acceleration?
This value is a vector quantity.
What is velocity?
Why is speed not a vector quantitiy?
Speed does not include direction?
Is a cart that rolls to the right at a constant 3.0 m/s experiencing a net force?
No. Because there is no acceleration
A 15.0 kg cart has a net force of 10 N to the right. What is its acceleration?
What is 0.66 m/s2?
What effect will a doubling of the net force have on acceleration if the mass stays the same?
What is acceleration doubles?
A student walks 40 m west and 30 m east. What is the distance traveled?
What is 70 m?
Ashlee decides to go golfing, but she refuses to swing her club. The ball stays put. What law is this an example of?
What is the first law?
What would be the best way to get away from an rhinoceros that is chasing you?
Run in a zigzag pattern.
A 6.0 kg object accelerates at 2.5 m/s² left. What is the net force?
What is 15 N?
How is acceleration related to net force?
They are directly proportional.
A student walks 40 m west and 30 m east. What is the displacement?
What is 10 m?
An objects velocity remains constant unless a net external force acts on it.
What is Newton's First Law?
Fred spends most Sunday afternoons at rest on the sofa, watching pro football games and consuming large quantities of food. What affect (if any) does this practice have upon his inertia?
If Fred's mass increases his interia will increase.
Two horizontal forces act on a cart: 2 N right and 2 N left. What is the motion?
What is constant or at rest?
A 1200 kg car experience an acceleration of 4 m/s2. What net force did it experience?
4,800 N
A car travels 200 m in 20 s. What is the average speed?
What is 10 m/s?
A carts velocity changes from +6 m/s to +10 m/s in 5 s. What is its average acceleration?
0.8 m/s2
Two identical spring loaded dart guns are simultaneously fired straight downwards. One fires a regular dart; the other a weighted dart. Which hits the ground first
Regular dart. Less mass so higher acceleration.
A moving object has a net force in the same direction as its velocity. What will happen to the object's speed?
What is it will increase?
If a ball that is moving right is slowing down which direction is the net force?
What is left?
Larry kicks a football as hard as he can. Faith kicks a football as hard as she can. The football Faith kicked travels a greater distance. Which Newton law is this an example of?
What is the second law?
A semi-truck and a car collide with a force of 5500 N. When the semi-truck collides with the car it experiences an acceleration of 2.68 m/s2. When the car collides with the semi truck it experiences an acceleration of 10 m/s2. Why does the semi-truck and the car experience such different accelerations.
The semi-truck has more mass so it experiences less of an acceleration