1. QQ: True or False? Share your reasoning.
1. A force is a push or pull exerted upon an object which results from the interaction of that object with its environment.
2. A quarterback throws a football down field. Once thrown, the force from the quarterback persists upon the ball to cause it to continue on its upward trajectory towards its peak.
3. A sled slides down the hill and reaches the bottom where it gradually slows to a stop. Once on the level ground, the force of the hill persists upon the sled to allow it to continue its forward motion.
4. Forces always cause objects to move.
5. An object can experience two or more forces and not accelerate.
6. Spring and tension forces are examples of field forces.

2. QQ: True or False? Share your reasoning.
1. A force is a push or pull exerted upon an object which results from the interaction of that object with its environment.
2. A quarterback throws a football down field. Once thrown, the force from the quarterback persists upon the ball to cause it to continue on its upward trajectory towards its peak.
3. A sled slides down the hill and reaches the bottom where it gradually slows to a stop. Once on the level ground, the force of the hill persists upon the sled to allow it to continue its forward motion.
4. Forces always cause objects to move.
5. An object can experience two or more forces and not accelerate.
6. Spring and tension forces are examples of field forces.
True - This is a great definition of force.

3. QQ: True or False? Share your reasoning.
1. A force is a push or pull exerted upon an object which results from the interaction of that object with its environment.
2. A quarterback throws a football down field. Once thrown, the force from the quarterback persists upon the ball to cause it to continue on its upward trajectory towards its peak.
3. A sled slides down the hill and reaches the bottom where it gradually slows to a stop. Once on the level ground, the force of the hill persists upon the sled to allow it to continue its forward motion.
4. Forces always cause objects to move.
5. An object can experience two or more forces and not accelerate.
6. Spring and tension forces are examples of field forces.
False - The force of the quarterback on the football is a contact force which can only exist during the interaction (i.e., the contact) between the quarterback's hands and the football. Once thrown, the football continues its horizontal motion due to its own inertia and its vertical motion is effected by the force of gravity.

4. False - Be careful if you answered true to this one
False - Be careful if you answered true to this one. If you did, perhaps you believe in the fatal misconception that a rightward force is required to sustain a rightward motion. The sleds motion to the right can be described as a leftward accelerated motion. Such a leftward acceleration demands that there is a leftward force (despite its rightward force). This leftward force slows the rightward-moving sled down. The hill cannot push on the sled unless the hill is in contact with the sled.
QQ: True or False? Share your reasoning.
1. A force is a push or pull exerted upon an object which results from the interaction of that object with its environment.
2. A quarterback throws a football down field. Once thrown, the force from the quarterback persists upon the ball to cause it to continue on its upward trajectory towards its peak.
3. A sled slides down the hill and reaches the bottom where it gradually slows to a stop. Once on the level ground, the force of the hill persists upon the sled to allow it to continue its forward motion.
4. Forces always cause objects to move.
5. An object can experience two or more forces and not accelerate.
6. Spring and tension forces are examples of field forces.

5. QQ: True or False? Share your reasoning.
1. A force is a push or pull exerted upon an object which results from the interaction of that object with its environment.
2. A quarterback throws a football down field. Once thrown, the force from the quarterback persists upon the ball to cause it to continue on its upward trajectory towards its peak.
3. A sled slides down the hill and reaches the bottom where it gradually slows to a stop. Once on the level ground, the force of the hill persists upon the sled to allow it to continue its forward motion.
4. Forces always cause objects to move.
5. An object can experience two or more forces and not accelerate.
6. Spring and tension forces are examples of field forces.
False - Forces, if unbalanced, can cause objects to accelerate (one form of moving; the other form is moving at a constant velocity). But by no means can one say that forces always cause objects to move. For instance, as you sit in your chair, the chair pushes up on your body but your body does not move.

6. QQ: True or False? Share your reasoning.
1. A force is a push or pull exerted upon an object which results from the interaction of that object with its environment.
2. A quarterback throws a football down field. Once thrown, the force from the quarterback persists upon the ball to cause it to continue on its upward trajectory towards its peak.
3. A sled slides down the hill and reaches the bottom where it gradually slows to a stop. Once on the level ground, the force of the hill persists upon the sled to allow it to continue its forward motion.
4. Forces always cause objects to move.
5. An object can experience two or more forces and not accelerate.
6. Spring and tension forces are examples of field forces.
True - Certainly! As you sit in your chair, the chair pushes up on your body but your body does not accelerate. This upward force (known as the normal force) is balanced by the downward force of gravity. Many objects experience a force yet do not accelerate.

7. QQ: True or False? Share your reasoning.
1. A force is a push or pull exerted upon an object which results from the interaction of that object with its environment.
2. A quarterback throws a football down field. Once thrown, the force from the quarterback persists upon the ball to cause it to continue on its upward trajectory towards its peak.
3. A sled slides down the hill and reaches the bottom where it gradually slows to a stop. Once on the level ground, the force of the hill persists upon the sled to allow it to continue its forward motion.
4. Forces always cause objects to move.
5. An object can experience two or more forces and not accelerate.
6. Spring and tension forces are examples of field forces.
False - Spring and tension are examples of contact forces. The spring or the rope/cable/wire are in contact with the object upon which it exerts its push or pull. The field forces are electric force, magnetic force, and gravity force.

10. Tension is a force that is distributed along a linear object like a rope, string, wire, cable, chain, etc.
It is transmitted when the ‘linear object’ is stretched by other forces which act at opposite ends and pull in opposite directions.
Any tension force generated is evenly distributed along the length of the linear object.

11. In this example, even as it approaches its breaking point, it continues to hold.
The forces are balanced and
in equilibrium. Logically,
this means there must be some force holding it together.
The tension at the bottom equals the for weight of the kitten. The tension of the rope below the fray must be equal to the tension below it only in the opposite direction.

12. Forces of tension are acting at the same time as other forces.

13. These forces are of equal magnitude so the forces are balanced.
By pulling on the rope from opposite ends and in opposite directions, each team applies force to the rope. The greater the opposing pulling forces, the greater the magnitude of tension force along the rope.
These forces are of equal magnitude
so the forces are balanced.

14. Tension is measured in Newtons.
The smaller the opposing pulling forces, the lesser the ‘magnitude’ of the tension force per unit area of the rope.
Tension is measured in Newtons.

16. Two 100-N weights are attached to a spring scale as shown
Two 100-N weights are attached to a spring scale as shown. Does the scale read zero, 100 N, or 200 N -- or some other reading?

17. The scale reads the tension in the string
The scale reads the tension in the string. The tension in the string is 100 N. This is the force the string must exert up on either of the 100-N weights at either end of the string.

18. Nothing is moving, nothing is accelerating, so the net force on the spring is zero. Likewise, the net force on either of the 100-N weights is also zero. But that is another question. The spring scale does not measure the net force. The spring scale simply measures the tension, the magnitude of the force exerted by the string.

19. Why are we able to walk?

20. Force exerted
on the person’s foot by the ground. Fpg
We walk forward because when one foot pushes backward against the ground, the ground pushes forward on that foot.
Force exerted on the ground
by person’s foot. Fgp
Fgp=-Fpg

21. What makes a car go forward?

22. By Newton’s third law, the ground pushes on the tires in the opposite direction, accelerating the car forward.

23. Which is stronger, the Earth’s pull on an orbiting space shuttle or the space shuttle’s pull on the earth?

24. According to Newton’s Third Law, the two forces are equal and opposite
According to Newton’s Third Law, the two forces are equal and opposite. Because of the huge difference in masses, however the space shuttle accelerates much more towards the Earth than the Earth accelerates toward the space shuttle.
a = F/m

25. What force is needed to accelerate the 60 kg cart at 2m/s2?

26. What force is needed to accelerate the 60kg cart at 2 m/s2?
Force = mass times acceleration
F = m * a
F = 60kg * 2m/s2
F = 120kgm/s2
Kgm/s2 = Newton
Newton = N
F =120 N

27. A force of 200 N accelerates a bike and rider at 2 m/s2
A force of 200 N accelerates a bike and rider at 2 m/s2. What is the mass of the bike and rider?

28. A force of 200 N accelerate a bike and rider at 2m/s^2
A force of 200 N accelerate a bike and rider at 2m/s^2. What is the mass of the bike and rider?
F = ma therefore: m =F/a
m = 200N/2m/s2
N= kgm/s2 so when divide your answer will be kg left.
m = 100kg

29. Why can you exert greater force on the pedals of a bicycle if you pull up on the handlebars?
The handlebars then pull down on you, somewhat as if someone were pushing down on your shoulders. This lets you exert a greater downward force on the pedals.