Physics module 4 and 5 help

A hockey puck slides across the ice with an acceleration of −0.67 m/s2. If the puck has a mass of 160 g, what is the coefficient of kinetic friction between the puck and the ice?

0.068

Colette is going camping in the snow. She carries all of her gear behind her on a sled. The sled has a mass of 34 kg. In order to maintain a constant velocity, Colette must pull with a force of 26.7 N. What is the coefficient of kinetic friction between the sled and the snow?

0.08

Curling is a sport where competitors slide special stones across the ice, aiming for certain targets. Janessa is in a curling competition. Her stone has a mass of 18.9 kg, and the coefficient of friction between the stone and the ice is 0.030. If Janessa releases her stone with an initial velocity of 4.82 m/s, how far will the stone travel before it comes to rest?

39.5 m

Helena and Bryce are pushing a filing cabinet to a new location. The filing cabinet weighs 800 N, and the floor pushes up with a force of 800 N. Helena is pushing north with a force of 135 N, Bryce is pushing north with a force of 120 N, and the force of friction is pushing southward with a force of 210 N. What is the net force on the filing cabinet?

45 N north

Regina and her friend are pushing a broken car. The force of gravity pulls downward with 11,500 N. The ground pushes upward with a force of 11,500 N. Regina is pushing south with a force of 260 N, and her friend is pushing south with a force of 195 N. If the force of friction is 395 N, what is the net force on the car? 455 N, north

60 N south

Examine the free body diagram shown above. What is the net force on the object depicted in this diagram?

70 N in the positive x-direction

A 10.0 kg cannonball is fired from a 145 kg cannon with a force of 850.0 N to the East. What is the acceleration of the cannonball?

85.0 m/s^2 to the east

Terrence's car has a mass of 1455 kg. What is the weight of his car?

14,270 N

Examine the free body diagram shown above. What is the magnitude of the net force on this object?

21N

What is the kinetic energy of a 72.2 kg cheetah moving at a velocity of 25.9 m/s?

24,200 J

A team of dogs is pulling a sled directly south. The dogs pull with a combined force of 334 N, and the force of friction acts in the opposite direction with a magnitude of 87.0 N. If the sled weighs 91 kg, what will the speed of the sled be after 1.5 seconds?

4.1 m/s

Samuel is pushing a loaded shopping cart out to his car. He pushes with a force of 48.8 N, causing the cart to accelerate at a rate of 1.15 m/s2. What is the mass of the loaded shopping cart?

42.4 kg

Which of the following statements best describes what a force is?

A push or pull that causes an object to accelerate.

If an object has a net force acting on it then the object will experience ___.

Acceleration

Which of the following correctly states the law of conservation of energy?

Energy cannot be created or destroyed, but it can change forms.

Sasha is riding on an amusement park ride. When she is accelerating downward, which of the following statements is accurate?

Her apparent weight is less than her actual weight.

Which of the following statements about the force of friction are accurate? (Choose all that apply)

Increasing the mass of an object will increase the force of friction, The force of friction acts in the direction opposite of motion, The force of friction is determined, in part, by the magnitude of the normal force

Diego and Rory climb a 4.89 m ladder in the same amount of time. If Diego weighs 823 N, and Rory weighs 951 N, who has done more work?

Rory

Caroline is on an airplane. At one point in the flight, she measures that her luggage has an apparent weight of 135 N. The actual weight of her luggage is 115 N. Which of the following best describes the vertical motion of the airplane?

The airplane is accelerating upwards at 1.71 m/s^2

Shonda is driving down the road. The force of gravity is pulling her car downward with 17,000 N, and the ground is pushing upward with 17,000 N. Her car is producing a forward force of 880 N, and the air resistance is producing an 880 N force in the opposite direction. Which statement accurately describes the motion of Shonda's car at this moment?

The car is moving with constant velocity.

Two bowling balls, red and gray, are rolling with the same velocity. The red bowling ball has a mass of 5.90 kg, and the gray bowling ball has a mass of 7.20 kg. Which statement about these bowling balls is accurate?

The gray bowling ball has more inertia than the red ball.

A skydiver jumps out of an airplane. After some time, they are moving downward with a constant velocity, but they are no longer accelerating. Which of the following statements are accurate? (Choose all that apply)

The skydiver's apparent weight is equal to their actual weight, The net force acting on the skydiver is 0 N, The drag of the air provides the normal force.

Shonda is driving down the road. The force of gravity is pulling her car downward with 17,000 N, and the ground is pushing upward with 17,000 N. Her car is producing a forward force of 880 N, and the air resistance is producing an 880 N force in the opposite direction. Which statement describes the net force on Shonda's car at this moment?

There is zero net force.

Newton's 3rd Law states:

When one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.

Which of the following correctly states the work-energy theorem?

Work must be done to change an object's kinetic energy.

According to Newton's first law of motion, what condition is required for an object to change speed or direction?

an unbalanced force

Which of the following are examples of field forces? (Choose all that apply)

gravitational force, magnetic forces, static electricity

Jaqueline is pushing a heavy shopping cart through a store. She notices that when she builds up speed, it becomes difficult to stop the cart. What is this tendency to resist change in speed called?

inertia

The SI units for work are Joules. Which of the following is an equivalent unit to the Joule?

kgm^2/s^2

In physics, the amount of work done on an object is the product of

the force applied to the object and the distance the object moves in the direction of the force.

Which of the following is an example of a normal force?

the force of the ground pushing upward on a book

Reggie is pulling his little sister and dog across the snow on a sled. Which of the following forces should be drawn in the free body diagram of this situation? (Choose all that apply)

the ground pushing upward on the sled, the pulling force Reggie exerts on the sled, the downward force of gravity on the sled, the friction that slows the sled down

Victoria slides a 1.1 kg stone across a frozen pond. The coefficient of kinetic friction between the stone and the ice is 0.12. What is the stone's rate of acceleration as it slides across the pond?

-1.18 m/s^2

Sean works in a warehouse. One day, he pushes a cardboard box of inventory across the floor. The box has a mass of 17.0 kg, and the coefficient of kinetic friction between the cardboard and the floor is 0.22. When Sean releases the box, what is the box's rate of acceleration?

-2.16 m/s^2

Jeremy is working at a clothing store. He picks up a 220 N box of clothing off of the ground, and places it on a shelf 1.15 m above the floor. How much work does Jeremy perform in lifting the box up?

253 J

A rope attached to a sled makes an angle of 36° with the ground. Charlie applies a constant force of 55 N to the rope. If he does 1420 J of work, how far does he drag the sled?

32 M

Monica is holding a 1.20 kg book in her hand. She holds the book 1.40 m above the ground. Assuming the book does not move during this time, how much work has Monica done?

0 J

Henry throws a 650-gram stone off of a cliff. What is the apparent weight of the stone while it is in free fall?

0 N

A 68.0 kg baseball player jumps into the air, and throws a 145 g baseball directly east. He throws the baseball with a force of 4.40 N. What is the resulting acceleration of the player?

0.064 m/s^2 west

A 2-kg toy truck is traveling eastward with a constant velocity of 5 m/s, what is the net external force acting on the car?

0N

A standard baseball has a mass of 145 g. What is the weight of a standard baseball?

1.42 N

A car has a mass of 1315 kg. The coefficient of kinetic friction between the car's tires and the road is 0.83. If the car was to skid to a stop, what would the force of friction be while the car was sliding?

10,700 N

A 142 g baseball is thrown at a speed of 42.9 m/s. What is the kinetic energy of the baseball at this moment?

131 J

On the surface of Mars, the acceleration of gravity is 3.711 m/s2. The Curiosity rover, which examines that the surface of Mars, has a mass of 3893 kg. What is the weight of the rover on the surface of the planet Mars?

14,450 N

Examine the free body diagram shown above. What is the net force on the object depicted in this diagram?

17 N, 17 above the negative x-axis

Stephen is riding an amusement park ride. His actual weight is 877 N. At one point during the ride, Stephen is accelerating downward at a rate of 7.75 m/s2. What is Stephen's apparent weight during this period of acceleration?

184 N

A hot air ballon with a mass of 371 kg is flying 615 m above the ground. How much gravitational protential energy does the ballon have?

2.24 x 10^6

An asteroid has a mass of 8.55∗106 kg. The asteroid crashes into the surface of a moon. As it is about to crash into the moon, the force of gravity exerted on the asteroid is 1.96∗107 N. What is the acceleration of gravity on the surface of this moon?

2.29 m/s^2

What is the gravitational potential energy of a 4250 kg cart at the top of a 56.5 m hill?

2.36 x 10^6 J

A woman is standing on a raft. Paddling, she causes an average force of 17.0 N to be applied to the raft directly east. The wind also exerts a force on the raft. This force has a magnitude of 15.0 N and points directly north. Ignoring any resistance from the water, find the net force on the raft.

22.7N at 41.4° N of E

A jumbo jet cruises at a constant velocity when the total thrust of the engines on the jet is 30,000 N. How much air resistance acts on the jet?

30,000 N in the opposite direction of the jet

A 2300 kg roller coaster cart is at the top of a 49 m hill. If all of the cart's potential energy is converted into kinetic energy, how fast will the roller coaster be moving when it reaches the bottom of the hill?

31 m/s

Two people are pushing a 985-kilogram car. One person applies a force of +209 N to the car, while the other person applies +289 N, in the same direction. A third force −184 N (friction) acts opposite these forces. What is the net force on the car?

314N

A crate on a construction site has a two forces acting on it. The downward pull of gravity exerts a force of 65,500 N, while a crane exerts an upward force of 70,200 N. What is the net force on the crate?

4700N upward

As part of a contest, two people are each pulling a 1370-kg car towards themselves. One person applies a 1156-N force to the right, while the other person applies a 1205-N force towards the left. What is the net force on the car?

49N to the left

A 1910 kg truck pushes on the road with a force of 9560 N. What is the acceleration of the truck?

5.01 m/s^2

A 10.0 kg cannonball is fired from a 145 kg cannon with a force of 850.0 N to the East. What is the acceleration of the cannon?

5.86 m/s^2 to the west

Leslie has a miniature car powered by an air tank. The car weighs 3.44 kg, and the air tank produces a force of 40.2 N. Leslie releases the car from rest, and it begins accelerating. After a period of 2.95 seconds, what distance has the miniature car traveled?

50.8 m

A 855 kg car pushes on the road with 5450 N of force. What is the magnitude of the force the road exerts back on the car, and what is the acceleration of the car?

5450 N, 6.37 m/s^2

A supermarket shopper pushes a shopping cart with 19.8 N of force at angle of 27.0° downward from the horizontal. What is the work done by the shopper as the cart moves 32.3 m down the aisle?

569 J

When Shiela stands on a scale at home, she measures her weight to be 755 N. When she stands on the scale in a moving elevator, she measures her weight to be 690 N. During the elevator ride, what is Shiela's apparent weight?

690 N

. Jim runs the 100 m dash. He is able to accelerate at 7.0 m/s at the beginning of the race. Jim is able to create a force of 250 N when he leaves the starting line. What is Jim's mass?

35.7 N

A 10.0 kg cannonball is fired from a 145 kg cannon with a force of 850.0 N to the East. What is the force acting on the cannon?

850.0 N to the west

Leroy is a tow truck driver. He is using a device called a winch to pull a broken car onto his tow truck. The broken car has a mass of 1840 kg. The winch begins pulling the car with a force of 835 N. What is the acceleration of the car when this force is applied?

0.454 m/s^2

A wooden crate falls out of the back of a contractor's truck. When it lands on the concrete road, it begins sliding and friction causes it to slow down. If the crate has a mass of 21 kg and the force of friction is 128 N, what is the coefficient of kinetic friction between the wood crate and the concrete road?

0.62

Chelsea is pulling a box of sporting equipment across a soccer field. She pulls northward with a force of 65.5 N. The force of friction acts southward with a force of 35.2 N. If the box has a mass of 41.8 kg, what is the acceleration of the box once Chelsea starts pulling?

0.725 m/s^2

Claude is pulling a sled full of camping gear through the snow. He pulls the sled with a rope, applying a force of 54 N. After pulling the sled for 1.28 km, he has performed 65.4 kJ of work. What is the angle, θ, between the rope and the direction the sled traveled?

19

Kelly is pushing a cart across the physics laboratory at her school. The cart has a mass of 91.0 kg. As she pushes, the cart accelerates at a rate of 0.211 m/s2. How much force is Kelly exerting on the cart?

19.2 N

Roland is pulling a box of supplies out of a storage closet. The box has a mass of 220 kg, and the coefficient of friction between the box and the ground is 0.17. When the box is sliding, what is the magnitude of the force of friction?

367 N

While swimming, an 83 kg swimmer pushes the water backwards with a force of 37 N. What force does the water apply to the swimmer?

37 N forward

If you push on a wall with 45 N, how much force does the wall apply back to you?

45 N

Glenn is trying to move a refrigerator by himself. He is pushing, but he cannot get the refrigerator to move at all. Which of the following statements is accurate?

The coefficient of static friction is too high for Glenn to overcome.

Samuel has an actual weight of 1553 N. When he measures his weight in a moving elevator, he measures an apparent weight of 1615 N. Which of the following statements is accurate about Samuel's movement in the elevator?

The elevator is accelerating upward.

given v, how high will the object get if it converts all of its energy to GPE?... Tatiana is riding her bicycle around her neighborhood. While on flat ground, she reaches a speed of 13.8 m/s. When she gets to the bottom of a large hill, she stops pedaling, and coasts up the hill. Assuming all of her kinetic energy is converted into gravitational potential energy, how high on the hill will Tatiana get?

9.70 M

Zoey is pulling her little brother around the neighborhood in a wagon. She pulls with a force of 27.0 N, at an angle of 41° above horizontal. As a result, the wagon moves horizontally for a distance of 48.8 m. How much work did Zoey do during this time?

994 J