1) A baseball thrown by a pitcher is hit by a batter. At the moment when the ball hits the bat, the force exerted on the bat by the ball is Fball on bat and the force exerted on the ball by the bat is Fbat on ball. The relationship between these forces is
A) Fball on bat > Fbat on ball
B) Fball on bat = -Fbat on ball
C) Fball on bat < Fbat on ball
D) Fball on bat = Fbat on ball
2) As a ladder leans against a wall it exerts a force on both the wall and ground. What are the two reactant forces on the ladder?
A) -F wall on ladder and -F ground on ladder
B) -F wall on ladder and F ground on ladder
C) F wall on ladder and F ground on ladder
D) F wall on ladder and -F ground on ladder
3) How can Newton’s laws explain why the brain is in danger of injury when there is impact to the head?
A) the blood vessels of the brain expand, so more blood flows to the brain
B) The brain moves inside the skull with a force equal and opposite to that of the impact
C) The blood vessels of the brain shrink, so less blood flows to the brain
D) The brain is fixed in one place inside the skull and cannot move away from the impact
4)While you push a box you begin to decrease the force you are exerting on the box. When will the box reach equilibrium?
A) when the force of the box becomes Fyou on box < Fbox on you
B) when the force you are exerting on the box is equal to 0
C) the box will never reach equilibrium
D) when the Fyou on box = -Fbox on you
5) Nina and John are practicing an ice skating routine. Nina is standing still. John, who is twice as heavy as Nina, skates toward her, pushing Nina away with force f. Assuming the system is closed, which statement is correct about this syestem?
A) Nina experiences a force equal to f
B) Nina experiences a force equal to f/2
C) Nina experiences a force equal to 2f
D) Nina experiences a force equal to f^2
1. Fball on vat =-Fbat on ball
2. -Fwall on ladder and -Fground on ladder.
3. The brain moves inside the skull with a force equal and opposite to that of the impact.
4. When the force you are exerting on the box is equal to 0.
5. Nina experiences a force equal to f.
1. fball on bat = -fbat on ball
2.-fwall on ladder and -fground on ladder
3.brain moves insude skull
4.equal to 0
5. force equal to f.
still 100% right as of 2022!
thx
anon and anonymous are 100% right
dont trust answers that are just letters because they can get mixed around on different people's tests. Anyways the first anonymous with 20+ likes is fully right
1) To determine the relationship between the forces exerted on the bat and the ball, we can utilize Newton's third law of motion, which states that for every action, there is an equal and opposite reaction.
In this case, when the ball hits the bat, the force exerted by the ball on the bat (Fball on bat) is equal in magnitude but opposite in direction to the force exerted by the bat on the ball (Fbat on ball).
Therefore, the correct answer is D) Fball on bat = Fbat on ball.
2) When a ladder leans against a wall, it exerts two reactive forces: one on the wall and one on the ground.
Using Newton's third law of motion, we know that these reactive forces are equal in magnitude but opposite in direction to the forces exerted on the ladder by the wall and the ground.
Therefore, the correct answer is D) F wall on ladder and -F ground on ladder.
3) Newton's laws of motion can help explain why the brain is in danger of injury when there is an impact to the head.
According to Newton's first law of motion, an object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted upon by an external force.
When there is an impact to the head, the external force causes the brain to move inside the skull. Newton's second law of motion states that the force acting on an object is equal to its mass multiplied by its acceleration (F = ma). Since the brain has mass, the acceleration caused by the impact generates a force on the brain.
This force can potentially cause injury to the brain, even if the skull remains intact. Therefore, the correct answer is B) The brain moves inside the skull with a force equal and opposite to that of the impact.
4) To determine when the box will reach equilibrium while you push it and begin to decrease the force, we need to consider Newton's first law of motion, also known as the law of inertia.
According to this law, an object at rest or in motion will remain at rest or in uniform motion (constant velocity) along a straight line unless acted upon by an external net force.
If the force you exert on the box decreases and eventually becomes less than or equal to the force of the box pushing back on you, the box will reach equilibrium. This means that the net force on the box is zero, and it will either remain at rest or continue to move at a constant velocity.
Therefore, the correct answer is B) when the force you are exerting on the box is equal to 0.
5) When Nina and John are practicing an ice skating routine and John, who is twice as heavy as Nina, pushes her away with force f, we need to consider Newton's third law of motion.
According to Newton's third law, for every action, there is an equal and opposite reaction. When John pushes Nina with force f, the reactive force acting on John is also f but in the opposite direction.
Since Nina experiences the reactive force, she will also experience a force equal in magnitude but opposite in direction to the force John applies to her.
Therefore, the correct answer is A) Nina experiences a force equal to f.
1. B
2. I do not understand, forces on wall and ground are not the same magnitude in general.
3. D
4. D but it is true the whole time, third law
5. A Once again Newton's third law
Are their answers right?
1. b
2. a
3. b
4. b
5. a
correct answers! hope this helped.