Help with Newtons laws of motion and force?

In summary, the conversation covers various questions related to physics and forces. The first question involves calculating the weight of a box on Pluto, while the second question asks for the acceleration of a block on a frictionless surface. The third question discusses the acceleration of an elevator and the relevance of finding its mass. The fourth question involves calculating the force exerted by Mr. Tubbs' face on Cain Velasquez's fist, and the fifth question asks for the frictional force on a block being accelerated by a given force. The conversation also briefly touches upon the use of free body diagrams in problem-solving.
  • #1
AveryB
1
0
If anyone could tell me how to answer these questions that would be fantastic. Thank you so much!

1. A box that weighs 66.2 N on Jupiter is taken to Pluto. The weight of the box on Pluto will be ____. (acceleration on pluto is 0.42) Would you find the mass first?

2. The hand in the image above is applying a force to the right of 69 Newtons. The surface that the blocks are sliding across is frictionless. If the mass of block A is 11 kg and the mass of block B is 31 kg, the acceleration of block B is ____. I tried subtracting the two masses and doing them separate to find acceleration but it did not work.

3. student stands on a bathroom scale in an elevator at rest on the 64th floor of a building. The scale reads 836 N. As the elevator moves up, the scale reading increases to 960 N, then decreases back to 836 N. The acceleration of the elevator is ___. Would you find the mass? If so, how? Would the two 836's cancel each other out leaving only 960? Is that the net force?

4. On Saturday, October 23, 2010, Cain Velasquez won the UFC heavyweight championship. Velasquez has a mass of 111 kg. Sometime later, Velasquez punches Mr. Tubbs in the face for giving his students too much homework. If Mr. Tubbs has a mass of 93 kg and Velasquez punches Mr. Tubbs with a force of 596.3 Newtons, then Mr. Tubbs' face exerts a force of _____
on Velasquez's fist. How does the total force come into play? Is there info that isn't relevant?

5. A force of +40.0 N accelerates a 5.0 kg block at 6.0 m/s2 along a horizontal surface. The frictional force is ___.
What does the 40 N have to do with anything? How do I incorporate that into the problem?
 
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  • #2
Please submit your problems in separate threads.

Have you considered drawing free body diagrams, or do you feel that you have advanced beyond the point where you need to draw free body diagrams.

Chet
 

What are Newton's laws of motion?

Newton's laws of motion are three fundamental laws that describe the behavior of objects in motion. The first law, also known as the law of inertia, states that an object will remain at rest or in uniform motion unless acted upon by an external force. The second law states that the force applied to an object is directly proportional to its mass and acceleration. The third law states that for every action, there is an equal and opposite reaction.

How do these laws apply to real-life situations?

These laws apply to everyday situations, such as pushing a shopping cart, kicking a ball, or driving a car. For example, when pushing a shopping cart, the first law explains why the cart stays in motion once it is pushed and why it stops when it hits an obstacle. The second law explains why it takes more force to push a heavier cart. The third law explains why you feel a force in the opposite direction when you push the cart.

What is the relationship between force and acceleration?

According to Newton's second law, the force applied to an object is directly proportional to its mass and acceleration. This means that the greater the force applied to an object, the greater its acceleration will be. Similarly, if the mass of the object increases, the same amount of force will result in a smaller acceleration.

How do Newton's laws of motion relate to gravity?

Newton's laws of motion also apply to gravitational forces. The first law explains why objects remain in orbit around larger bodies, such as the Earth orbiting the sun. The second law explains why objects fall to the ground with a certain acceleration due to the force of gravity. The third law explains why the Earth exerts an equal but opposite force on an object that is falling towards its surface.

How can I use Newton's laws to solve problems?

To solve problems involving Newton's laws, you can use the equation F = ma, where F represents force, m represents mass, and a represents acceleration. By manipulating this equation, you can solve for any of the variables. It is also helpful to draw free-body diagrams to visualize the forces acting on an object and use vector addition to find the resultant force. Practice and understanding the concepts behind the laws will also help in solving problems.

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