6. Intro to Forces (Dynamics)

Vertical Forces & Acceleration

6. Intro to Forces (Dynamics)

# Vertical Forces & Acceleration - Video Tutorials & Practice Problems

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concept

## Weight Force & Gravitational Acceleration

Video duration:

7mPlay a video:

2

Problem

ProblemThe Mars Rover Perseverance weighed about 10,000 N while on Earth. After it reached the surface of Mars, it weighed about 3790 N. What is the gravitational acceleration on Mars?

A

$g_{Mars}=0.039m/s^2$

B

$g_{Mars}=0.27m/s^2$

C

$g_{Mars}=3.7m/s^2$

D

$g_{Mars}=26m/s^2$

3

concept

## Vertical Forces And Acceleration in the Y-axis

Video duration:

6mPlay a video:

4

Problem

ProblemA 3-kg bucket is being pulled upwards by a cord. The tension in the cord is 35 N. What is the acceleration of the bucket? (The mass of the cord is negligible, which means you can assume m_cord = 0.)

A

25 m/s

^{2}B

1.9 m/s

^{2}C

21 m/s

^{2}D

8.4 m/s

^{2}5

example

## Lowering a Load of Bricks

Video duration:

5mPlay a video:

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PRACTICE PROBLEMS AND ACTIVITIES (41)

- You walk into an elevator, step onto a scale, and push the 'up' button. You recall that your normal weight is ...
- At the surface of Jupiter's moon Io, the acceleration due to gravity is g = 1.81 m/s2. A watermelon weighs 44....
- At the surface of Jupiter's moon Io, the acceleration due to gravity is g = 1.81 m/s2. A watermelon weighs 44....
- An astronaut's pack weighs 17.5 N when she is on the earth but only 3.24 N when she is at the surface of a moo...
- You walk into an elevator, step onto a scale, and push the 'up' button. You recall that your normal weight is ...
- A fisherman yanks a fish vertically out of the water with an acceleration of 2.5 m/s² using very light fishing...
- A light rope is attached to a block with mass 4.00 kg that rests on a frictionless, horizontal surface. The ho...
- Three sleds are being pulled horizontally on frictionless horizontal ice using horizontal ropes (Fig. E5.14). ...
- Two 25.0-N weights are suspended at opposite ends of a rope that passes over a light, frictionless pulley. The...
- Two 25.0-N weights are suspended at opposite ends of a rope that passes over a light, frictionless pulley. The...
- A 550-N physics student stands on a bathroom scale in an elevator that is supported by a cable. The combined m...
- A light rope is attached to a block with mass 4.00 kg that rests on a frictionless, horizontal surface. The ho...
- Three sleds are being pulled horizontally on frictionless horizontal ice using horizontal ropes (Fig. E5.14). ...
- A light rope is attached to a block with mass 4.00 kg that rests on a frictionless, horizontal surface. The ho...
- A 75.0-kg wrecking ball hangs from a uniform, heavy-duty chain of mass 26.0 kg. (b) What is the tension at a p...
- A 50 kg box hangs from a rope. What is the tension in the rope if: (c) The box has vy = 5.0 m/s and is speedin...
- A 50 kg box hangs from a rope. What is the tension in the rope if: (b) The box moves up at a steady 5.0 m/s?
- Astronauts in space 'weigh' themselves by oscillating on a spring. Suppose the position of an oscillating 75 k...
- The mass of the sun is 2.0 x 10^30 kg. A 5.0 x 10^14 kg comet is 75 million kilometers from the sun. What is t...
- A woman has a mass of 55 kg. (a) What is her weight while standing on earth?
- It takes the elevator in a skyscraper 4.0 s to reach its cruising speed of 10 m/s. A 60 kg passenger gets aboa...
- It takes the elevator in a skyscraper 4.0 s to reach its cruising speed of 10 m/s. A 60 kg passenger gets aboa...
- Zach, whose mass is 80 kg, is in an elevator descending at 10 m/s. The elevator takes 3.0 s to brake to a stop...
- FIGURE EX6.19 shows the velocity graph of a 75 kg passenger in an elevator. What is the passenger's weight at ...
- (II) A rocket with a mass of 2.45 x 10⁶ kg is launched by exerting a vertical force of 3.55 x 10⁷ N on the gas...
- (II) A woman stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale ...
- (II) What will a spring scale read for the weight of a 58.0‑kg woman in an elevator that moves(a) upward with ...
- (II) What will a spring scale read for the weight of a 58.0‑kg woman in an elevator that moves(b) downward wit...
- (II) What will a spring scale read for the weight of a 58.0‑kg woman in an elevator that moves(d) with a downw...
- (II) An exceptional standing jump would raise a person 0.80 m off the ground. To do this, what force must a 68...
- (II) What will a spring scale read for the weight of a 58.0‑kg woman in an elevator that moves(e) in free fall...
- (II) An 18.0-kg monkey hangs from a cord suspended from the ceiling of an elevator. The cord can withstand a t...
- "(II) High-speed elevators function under two limitations: (1) the maximum magnitude of vertical acceleration ...
- (III) An inclined plane, fixed to the inside of an elevator, makes a 38° angle with the floor. A mass m slides...
- (II) A narrow but solid spool of thread has radius R and mass M. If you pull up on the thread so that the cm o...
- (II) How much tension must a cable withstand if it is used to accelerate a 1400-kg car vertically upward at 0....
- (III) An object moving vertically has v→ =v₀ → at t = 0 . Determine a formula for its velocity as a function o...
- (III) An inclined plane, fixed to the inside of an elevator, makes a 38° angle with the floor. A mass m slides...
- A 6750-kg helicopter accelerates upward at 0.80m/s² while lifting a 1080-kg frame at a construction site, Fig....
- A wet bar of soap (m= 150g) slides freely down a ramp 3.0 m long inclined at 8.5°. How long does it take to re...
- (II) A 265-kg load is lifted 18.0 m vertically with an acceleration a = 0.140 g by a single cable. Determine(a...