Calculating Net Force
For each example, (1) identify the direction (same or opposite) that the main forces are acting on the object,
(2) the method to calculate net force (add or subtract
subtract), (3) calculate the net force,, and (4) identify if forces are
balanced or unbalanced.. Be sure to include your unit, Newtons (N).
Less
dense air
5000 N
Gravity
4000N
Person
pulling box
75 N
Person
pushing box
100 N
Ball rolling
60 N
1.
1.
1.
2
2
2
3.
3.
3.
4.
4.
4.
Ball hitting bat
70 N
Person
pulling
90 N
Air resistance
800 N
Swing
150 N
Person
pulling
90 N
Engine thrust
2200 N
1.
1.
1.
2
2
2
3.
3.
3.
4.
4.
4.
Friction
10 N
For each example, (1) identify the direction (same or opposite) that the main forces are acting on the object,
(2) the method to calculate
culate net force (add or subtract
subtract), (3) calculate the net force,, and (4) identify if forces are
balanced or unbalanced.. Be sure to include your unit, Newtons (N).
Golf ball pushing
down on tee
15 N
Pushing left
175 N
Tee pushing up on ball
15 N
Pushing left
175 N
Dog pulling
200 N
1.
1.
1.
2
2
2
3.
3.
3.
4.
4.
4.
Ladder pushing
on tree
100 N
Tree
pushing on
ladder
100 N
Pushing Pushing
snowball snowball
125 N
50 N
Ground
round
pushing up
120
0N
1.
1.
1.
2
2
2
3.
3.
3.
4.
4.
4.
Owner pulling
150 N
Gravity
pulling down
60 N
Calculating Net Force KEY
For each example, (1) identify the direction (same or opposite) that the main forces are acting on the object,
(2) the method to calculate net force (add or subtract
subtract), (3) calculate the net force,, and (4) identify if forces are
balanced or unbalanced. Be suree to include your unit, Newtons (N).
Less
dense air
5000 N
Gravity
4000N
Person
pulling box
75 N
Person
pushing box
100 N
Ball rolling
60 N
Friction
10 N
1. opposite directions
1. same directions
1. opposite directions
2. subtract forces
2. add forces
2. subtract forces
3. 5000N – 4000N = 1000N
3. 75N + 100N = 175N
3. 60N – 10N = 50N
4. Unbalanced
4. Unbalanced
4. Unbalanced
Ball hitting bat
70 N
Person
pulling
90 N
Air resistance
800 N
Swing
150 N
Person
pulling
90 N
Engine thrust
2200 N
1. opposite directions
1. opposite directions
1. opposite directions
2. subtract forces
2. subtract forces
2. subtract forces
3. 90N – 90N = 0 N
3. 150N – 70N = 80N
3. 2200N – 800N = 1400N
4. Balanced
4. Unbalanced
4. Unbalanced
For each example, (1) identify the direction (same or opposite) that the main forces are acting on the object,
(2) the method to calculate
culate net force (add or subtract
subtract), (3) calculate the net force,, and (4) identify if forces are
balanced or unbalanced.. Be sure to include your unit, Newtons (N).
Golf ball pushing
down on tee
15 N
Tee pushing up on ball
15 N
Pushing left
175 N
Pushing left
175 N
Dog pulling
200 N
Owner pulling
150 N
1. opposite directions
1. opposite directions
1. opposite directions
2 subtract forces
2 subtract forces
2 subtract forces
3. 15N – 15N = 0 N
3. 175N – 175N = 0 N
3. 200N – 150N = 50N
4. Balanced
4. Balanced
4. Unbalanced
alanced
Ladder pushing
on tree
100 N
Tree
pushing on
ladder
100 N
Pushing Pushing
snowball snowball
125 N
50 N
Ground
round
pushing up
120
0N
Gravity
pulling down
60 N
1. same direction
1. opposite directions
1. opposite directions
2 add forces
2 subtract forces
2 subtract forces
3. 125N + 50N = 175N
3. 100N – 100N = 0 N
3. 120N – 60N = 60N
4. Unbalanced
4. Balanced
4. Unbalanced