6. Intro to Forces (Dynamics)

Forces & Kinematics

6. Intro to Forces (Dynamics)

# Forces & Kinematics - Video Tutorials & Practice Problems

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## Solving Motion Problems with Forces

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2

Problem

ProblemAn 800-kg car is traveling along a horizontal road directly towards a cliff. The driver notices and brakes, resulting in a 5,000-N net force slowing the car down. If the car's initial speed was 20 m/s and the car stops just before going over the cliff, how far away was the car from the cliff when the driver hit the brakes?

A

1250m

B

0.03m

C

64m

D

32m

3

example

## Liftoff!

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PRACTICE PROBLEMS AND ACTIVITIES (22)

- (II) A child on a sled reaches the bottom of a hill with a velocity of 10.0 m/s and travels 25.0 m along a hor...
- When jumping straight up from a crouched position, an average person can reach a maximum height of about 60 cm...
- FIGURE EX6.10 shows the force acting on a 2.0 kg object as it moves along the x-axis. The object is at rest at...
- The forces in FIGURE EX6.9 act on a 2.0 kg object. What are the values of ax and ay, the x- and y-components o...
- Compressed air is used to fire a 50 g ball vertically upward from a 1.0-m-tall tube. The air exerts an upward ...
- A 20,000 kg rocket has a rocket motor that generates 3.0 x 10^5 N of thrust. Assume no air resistance. (a) Wha...
- A horizontal rope is tied to a 50 kg box on frictionless ice. What is the tension in the rope if: (b) The box ...
- a. A rocket of mass m is launched straight up with thrust Fₜₕᵣᵤₛₜ. Find an expression for the rocket's speed a...
- Your forehead can withstand a force of about 6.0 kN before fracturing, while your cheekbone can withstand only...
- A 500 g model rocket is on a cart that is rolling to the right at a speed of . The rocket engine, when it is f...
- As a science fair project, you want to launch an 800 g model rocket straight up and hit a horizontally moving ...
- Two rock climbers, Paul and Jeanne, use safety ropes of similar length. Jeanne's rope is more elastic, called ...
- A 25-g projectile is fired into a cube of ballistic gel at a velocity of 360 m/s. If the projectile penetrates...
- (III) A particle of mass m, initially at rest at x = 0, is accelerated by a force that increases in time as F...
- (II) At the instant a race began, a 65-kg sprinter exerted a force of 720 N on the starting block at a 22° ang...
- (II) At the instant a race began, a 65-kg sprinter exerted a force of 720 N on the starting block at a 22° ang...
- Two rock climbers, Paul and Jeanne, use safety ropes of similar length. Jeanne's rope is more elastic, called ...
- You are driving home in your 860-kg car at 15 m/s. At a point 45 m from the beginning of an intersection, you ...
- Suppose a 65-kg person jumps from a height of 3.0 m down to the ground.(c) Estimate the decelerating force if ...
- (II) The drag force on large objects such as cars, planes, and sky divers moving through air is more nearly F_...
- (III) Air resistance acting on a falling body can be taken into account by the approximate relation for the ac...
- (II) A 2.0-kg purse is dropped from the top of the Leaning Tower of Pisa and falls 55 m before reaching the gr...