Graphing
Calculating Acceleration
Calculating Weight
Net Forces
Newton's Laws
100
Select the graphs that would have balanced forces acting upon the object?
1, 2 & 3
Objects in motion stay in motion and objects at rest stay at rest until the forces become unbalanced.
Bonus: Which object is moving with constant velocity in the negative direction?
100
Calculate the acceleration of the yellow car. Include direction of the acceleration using east or west.
Acceleration = (vf - vi) / time
Acceleration = (10m/s - 10m/s) / 4s
Acceleration = (0 m/s) / 4s
Acceleration = 0 m/s/s
100
Calculate the weight of a 130 kg mass.
Weight = mass x gravity
Weight = 130 kg x 9.8 m/s/s
Weight = 1,274 N
100
Which force diagrams are unbalanced in the left/right direction?
C
100
List the 3 requirements of objects moving under Newton's 1st Law with regard to velocity, acceleration and forces.
Object must be at rest or moving with constant velocity.
Object must have 0 acceleration.
Object must have balanced forces.
200
Which of the graphs represent an object(s) moving with unbalanced forces?
4
Bonus: Which object is at rest?
200
Calculate the acceleration of the yellow car. Include direction of the acceleration using east or west.
Acceleration = (vf - vi) / time
Acceleration = (10m/s - 0m/s) / 3s
Acceleration = (10 m/s) / 3s
Acceleration = 3.33 m/s/s West
200
Calculate the mass of a 5,000 N object.
Mass = Weight / gravity
Mass = (5,000 N )/ (9.8 m/s/s)
Mass = 510.20 kg
200
Which Force Diagrams are unbalanced in the up/down direction?
D & E
200
List the 3 requirements of objects moving under Newton's 2nd Law with regard to velocity, acceleration and forces.
Object must have a changing velocity.
Object must have acceleration.
Object must have unbalanced forces.
300
Describe the relationship from the graph below.
As force increases acceleration also increases.
Bonus:
Which Newton's Law does this represent?
300
Calculate the acceleration of the yellow car. Include direction of the acceleration using east or west.
Acceleration = (vf - vi) / time
Acceleration = (0m/s - 20m/s) / 5s
Acceleration = (-20 m/s) / 5s
Acceleration = 4 m/s/s West
300
Calculate the weight of a 388 kg lion.
Weight = mass x gravity
Weight = 388 kg x 9.8 m/s/s
Weight = 3,802.4 N
300
Calculate the Net Force acting on a 100 kg object that is accelerating at 5 m/s/s north.
Fnet = mass x acceleration
Fnet = 100 kg x 5 m/s/s
Fnet = 500 N north
Bonus: Which direction is the object moving? If it is moving, what happening to the object's velocity?
300
An object is moving according to the Free Body Diagram below. Which of Newton's Laws is it following?
Newton's 2nd Law because the forces are unbalanced in the left/right direction.
Bonus: How would the object be moving if it was moving to the left?
400
Describe the relationship from the graph below.
As mass increases the acceleration decreases.
Bonus:
Which Newton's Law does this represent?
400
Calculate the acceleration of the 51 kg object represented in the Free Body Diagram below.
Fnet = mass x acceleration
acceleration = Fnet / mass
acceleration = (-50 N) / (51 kg)
acceleration = - 0.98 m/s/s
400
Calculate the gravitational acceleration, g, if the weight of the object is 5,000 N and the mass is 126 kg.
g = Weight / Mass
g = (5,000 N) / (126 kg)
g = 39.68 m/s/s
Bonus: Is this planet larger or smaller than Earth?
400
What is the acceleration of the 20.4 kg object based upon this Free Body Diagram?
Acceleration = Fnet / mass
Acceleration = (30 N) / (20.4 kg)
Acceleration = 1.47 m/s/s rightward
Bonus: Describe the motion of the object if the object is moving leftward.
400
An object is moving according to the Free Body Diagram below. Which of Newton's Laws is it following?
Newton's 2nd Law
Bonus: How would the object be moving if it was moving upward?
500
Which graph (1, 2, 3 or 4) matches the dot diagram for B?
4
Bonus:
The dot diagram for B could also match which other graph of position depends on time? Draw it!
500
An unbalanced force of 800 N acts on a 20 kg box. Calculate the acceleration of the box
acceleration = (Fnet) / mass
acceleration = (800N) / 20kg
acceleration = 40 m/s/s
500
Calculate the weight of a 10 kg hammer on the moon, which has a g value of 1.63 m/s/s.
Weight = mass x gravity
Weight = 10 kg x 1.63 m/s/s
Weight = 16.3 N
Bonus:
What is the weight of the hammer on earth?
500
What is the acceleration of the 3.06 kg object based on the Free Body Diagram?
Acceleration = Fnet / mass
Acceleration = (70 N) / (3.06 kg)
Acceleration = 22.87 m/s/s
Bonus: How fast would this object be going after 2 seconds if the object started at rest?
500
If an object is accelerating, it must be moving under which of Newton's Laws?
Newton's 2nd Law