Multiple choice questions on work and impulse.

• DavidDishere
In summary, we discussed a scenario where a golf ball was struck by a golf club on a practice range. The ball had a mass of 46 g and left the ground at a speed of 72 m/s at a 40 degree angle above the horizontal. Using the formula 1/2mv^2, we determined that the work done by the golf club on the golf ball was 120 J. We also discussed the total speed of the golf ball at the highest point of its trajectory, which was found to be 55 m/s. In addition, we examined a scenario where a piece of clay and a ball of the same mass were thrown at a wall with the same velocity. It was determined that the ball experiences a larger
DavidDishere
On a level practice range, a 46 g golf ball is struck by a golf club and leaves teh ground witha speed of 72 m/s at an angle 40 degrees above the horizontal. how much work was done by the golf club on the golf ball?

a. 32 J
b. 120 J
c. 230 J
d. 520 J
e. 3300 J

It's just 1/2mv^2 right? So 120 J?

What is the total speed of the golf ball at the highest point of its trajectory? Ignore air resistance.
a. 0 m/s
b. 36 m/s
c. 46 m/s
d. 55 m/s
e. 72 m/s

Its just the same as it started with right? 72 m/s?

A piece of clay and a ball of the same mass are thrown at a wall with the same velocity. The clay sticks to the wall and the ball bounces off. Which one of the following statements is correct regarding the impulse each experiences?

a. The clay has a larger impulse than the ball because it sticks to the wall.
b. The ball has a larger impulse than the clay because it bounces off the wall.
c. They have the same impulse because they have the same mass and initial velocity.
d. No comparison can be made without knowing the amount of time the ball is in contact with the wall.

I think the answer is b. Using mv/t, no matter what the ball is going to have less time in contact with the wall right? Or how would you even do that equation if it sticks? Is it the time it takes to come to a stop? Would it be d then?

1b: No. The initial velocity as it left the club was partly vertical and partly horizontal. At the high point what is true of Vy? Hint: Find Vx as that is constant throughout the flight.

2 is well reasoned.

The speed at the top of the trajectory is not 72. It slows down as it goes up. You'll have to separate the motion into its horizontal and vertical parts to deal with it.

So 55 for #2. What is the answer to the impulse question? b?

yes, it is (b) we told you twice already!

1. What is the difference between work and impulse in physics?

Work is defined as the product of force and displacement, while impulse is the product of force and time. In simpler terms, work measures the energy transferred to an object, while impulse measures the change in momentum of an object.

2. How are work and impulse related to each other?

Work and impulse are closely related, as both involve the application of a force to an object. In fact, impulse is the change in momentum caused by a force, and work is the energy transferred by that force.

3. Can you give an example of a multiple choice question on work and impulse?

One example of a multiple choice question on work and impulse could be: "A car traveling at 50 km/h comes to a complete stop in 10 seconds. What is the average force applied to the car to bring it to a stop?" The correct answer would be (C) 5000 N, as the impulse applied to the car is equal to the change in momentum, and the average force can be calculated using the formula F = mΔv/Δt.

4. How can I improve my understanding of work and impulse?

To improve your understanding of work and impulse, it is important to practice solving problems and working through different scenarios. You can also read up on the concepts and their applications in textbooks or online resources. Additionally, seeking help from a tutor or teacher can also be beneficial.

5. Are work and impulse the only factors that affect an object's motion?

No, there are other factors that can affect an object's motion, such as friction, gravity, and air resistance. Work and impulse only play a part in determining an object's velocity and momentum, but they are not the only factors at play.

• Introductory Physics Homework Help
Replies
1
Views
877
• Introductory Physics Homework Help
Replies
19
Views
1K
• Introductory Physics Homework Help
Replies
14
Views
2K
• Introductory Physics Homework Help
Replies
2
Views
1K
• Introductory Physics Homework Help
Replies
7
Views
5K
• Introductory Physics Homework Help
Replies
24
Views
3K
• Introductory Physics Homework Help
Replies
4
Views
4K
• Introductory Physics Homework Help
Replies
3
Views
4K
• Introductory Physics Homework Help
Replies
17
Views
2K
• Introductory Physics Homework Help
Replies
2
Views
1K