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A dog pulls on a pillow with a force of 5 N at an angle of 37 degrees above the horizontal. Find the x and y components of this force.

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Date created

Mar 1, 2020

Cards (33)

Section 1

(33 cards)

A dog pulls on a pillow with a force of 5 N at an angle of 37 degrees above the horizontal. Find the x and y components of this force.

Front

4 N; 3 N

Back

Is force a vector or scalar quantity?

Front

Vector

Back

Explain why a rope climber must pull downward on the rope in order to move upward. Discuss the force exerted by the climber's arms in relation to the weight of the climber during the various stages of each "step" up the rope

Front

As the climber exerts a force downward, the rope supplies a reaction force that is directed upward. When this reaction force is greater than the climber's weight, the climber accelerates upward.

Back

If an object is at rest, can we conclude that no external forces are acting on it?

Front

No; just that the net force equals zero

Back

Draw a free-body diagram showing the weight and normal forces on a laundry basket in the following situation: At rest on a horizontal surface

Front

Fg points down, and Fn points up

Back

An object is thrown into the air stops at the highest point in its path. Is it in equilibrium at this point? Explain.

Front

No; it has a net force downward (gravitational force)

Back

Draw a free-body diagram showing the weight and normal forces on a laundry basket in the following situation: At rest on a ramp inclined 45 degrees above the horizontal

Front

Fg points down, and Fn points up perpendicular to the surface of the ramp

Back

State Newton's second law in your own words.

Front

An object with greater mass requires a larger force for a given acceleration

Back

What acceleration will you give to a 24.3 box if you push it horizontally with a net force of 85.5 N?

Front

3.52 m/s^2

Back

A 0.150 kg baseball is thrown upward with an initial speed of 20 m/s. a. What is the force on the ball when it reaches half of its maximum height? b. What is the force on the ball when it reaches its peak?

Front

a. -1.47 N b. -1.47 N

Back

An astronaut on the moon has a 110 kg crate and a 230 kg crate. How do the forces required to lift the crates straight up on the moon compare with the forces required to lift them on Earth? (Assume that the astronaut lifts with constant velocity in both cases).

Front

One-sixth of the force needed to lift an object on Earth is need on the moon

Back

Two lifeguards pull on ropes attached to a raft. If they pull in the same direction, the raft experiences a net force of 334 N to the right. If they pull in the opposite directions, the raft experiences a net force of 106 N to the left. A. Draw a free-body diagram representing the raft for each situation. B. Find the force exerted by each lifeguard on the raft for each situation. (Disregard any other forces acting on the raft).

Front

A. F1 (220 N) and F2 (114 N) both point right; F1 (220 N) points left, and F2 (114 N) points right B. first situation: 220 N to the right, 114 N to the right; second situation: 220 N to the left, 114 N to the right

Back

Two forces are applied to a car in an effort to accelerate it, as shown below. a. What is the resultant of these two forces? b. If the car has a mass of 3200 kg, what acceleration does it have? (Disregarding friction)

Front

a. 770 N at 8.1 degrees to the right of forward b. 0.24 m/s^2 to the right of forward

Back

Is it possible for an object to be in motion if no net force is acting on it? Explain.

Front

Yes; the object could move at a constant velocity

Back

What's another name for Newton's first law?

Front

Law of Inertia

Back

Four forces act on a hot-air balloon, shown from the side in the figure below. Find the magnitude and direction of the resultant force on the balloon.

Front

1210 N at 62 degrees above the 1520 N force

Back

A beach ball is left in the bed of a pick up truck. Describe what happens to the ball when the truck accelerates forward.

Front

The ball moves toward the back of the truck because inertia keeps it in place relative to the ground.

Back

Draw a free body diagram for the following object: a ball falling in the presence of air resistance.

Front

Fg points down, and FR points up

Back

A chair is pushed forward with a force of 185 N. The gravitational force of Earth on the chair is 155 N downward, and the floor exerts a force of 155 N upward on the chair. Draw a free body diagram showing the forces acting on the chair.

Front

Fapplied (185 N) points forward, Fg (155 N) points downward, and Fn (155 N) points upward

Back

The force that attracts Earth to an object is equal to and opposite the force that Earth exerts on the object. Explain why Earth's acceleration is not equal to and opposite the object's acceleration.

Front

Because Earth has a very large mass

Back

What physical quantity is a measure of the amount of inertia an object as?

Front

Mass

Back

The tendency of an object not to accelerate

Front

Inertia

Back

A space explorer is moving through space far from any planet or star and notices a large rock, taken as a specimen from an alien planet, floating around the cabin of the ship. Should the explorer push it gently or kick it toward the storage compartment? Why?

Front

Push it gently; with a smaller force, the astronaut will experience a smaller reaction force

Back

Draw a free-body diagram showing the weight and normal forces on a laundry basket in the following situation: At rest on a ramp inclined 12 degrees above the horizontal

Front

Fg points down, and Fn points up perpendicular to the surface of the ramp

Back

What net force is required to give a 25 kg suitcase an acceleration of 2.2 m/s^2 to the right?

Front

55 N to the right

Back

Draw a force diagram to identify all the action-reaction pairs that exist for a horse pulling a cart.

Front

on the horse: the force of the cart, Fg down, Fn up, a reaction force of the ground on the hooves; on the cart: the force of the horse, Fg down, Fn up, kinetic friction

Back

Draw a free body diagram for the following object: an athlete running along a horizontal track.

Front

Fg points down, Ftrack points in the direction of the motion, and Fn points up

Back

An 1850 kg car is moving to the right at a constant speed of 1.44 m/s. a. What is the net force on the car? b. What would be the net force on the car if it were moving to the left?

Front

a. 0 b. 0

Back

Explain the relationship between mass and weight.

Front

Mass is the inertial property of matter. Weight is the gravitational force acting on an object. Weight is equal to mass times the free-fall acceleration.

Back

Draw a free body diagram for the following object: a helicopter lifting off a landing pad.

Front

Fg points down, and Frotors points p

Back

Draw a free-body diagram showing the weight and normal forces on a laundry basket in the following situation: At rest on a ramp inclined 25 degrees above the horizontal

Front

Fg points down, and Fn points up perpendicular to the surface of the ramp

Back

A large crate is placed on the bed of a truck but is not tied down. a. As the truck accelerates forward, the crate slides across the bed until it hits the tailgate. Explain what causes this. b. If the driver slammed on the brakes, what would happen to the crate?

Front

a. The inertia of the crate b. It could continue forward by inertia and hit the cab

Back

Earth exerts a downward gravitational force of 8.9 N on a cake that is resting on a plate. The plate exerts a force of 11.0 N upward on the cake, and a knife exerts a downward force of 2.1 N on the cake. Draw a free body diagram.

Front

Fg (8.9 N) and Fapplied (2.1 N) point downward, and Fn (11.0 N) points upward

Back