# physics

Here on earth and also on the moon two identical heavy crates (300kg) sit at rest on 2 identical level platforms with coefficients of static friction equal to (0.90). If one end of both platforms is slowly raised at the same time in both locations, will the crates eventually break free of the static friction at the same time or, because of the fact that gravity differs significantly between the two planets, will one break free sooner (i.e. at a lower angle of incline) than the other? If so, on which planet will the crate break free sooner?

1. 👍
2. 👎
3. 👁
1. The angle A at which a crate on a tilted platform "breaks free" is given by
M g *mus* cos A = M g sin A

The right side is the actual gravity force component down the ramp and the left side is the maximum static friction force to resist motion. The "g" is the local value, which is 1/6 as large on the Moon.

The solution is
tan A = mus (the static friction coefficient).

Therefore the angle A will be the same for Earth or moon. Both M and the "local" g cancel

1. 👍
2. 👎

## Similar Questions

1. ### physics

On the way to the moon, the Apollo astronauts reach a point where the Moon’s gravitational pull is stronger than that of Earth’s. Find the distance of this point from the center of the Earth. The masses of the Earth and the

2. ### Physics

The average distance separating Earth and the Moon (center to center) is 384 000 km. Use the data in Table 7.3 to find the net gravitational force exerted by Earth and the Moon on a 3.00 multiplied by 104 kg spaceship located

3. ### Physics [Help, need answer in 10 min]

During a solar eclipse, the moon (of mass 7.36 × 1022 kg), Earth (of mass 5.98 × 1024 kg), and Sun (of mass 1.99 × 1030 kg) lie on the same line, with the moon between Earth and the Sun. What gravitational force is exerted on

4. ### Physics

A 2.1kg brass ball is transported to the Moon. a)What is the mass of the brass ball on the earth and on the moon? Wouldn't it be 2.1kg for the earth as well as for the moon? b)Determing the weight of thee brass ball on the earth.

1. ### Physics

At some point during their orbit, the location of the Earth and Moon relative to the Sun will be as shown in the figure below. What are the magnitude, in N, and direction of the force experienced by the Moon, in degrees below the

2. ### science

How does gravity affect the moon? a) it pulls the moon toward earth b) it pushes the moon away from earth c) t allows the moon to move in a straight line d) it keeps the moon from colliding with the sun

3. ### Science

When the Moon is between the Earth and the Sun, how is the Moon most likely seen? A) New Moon B) Full Moon C) Half Moon D) Quarter Moon

4. ### Physics

The earth has about 80 times the mass of the earth’s moon. The gravitational force exerted on the moon by the earth has what relation to the gravitational force exerted on the earth by the moon? 1. the same as 2. zero; the earth

1. ### Science

The diagram below shows positions of the Moon as it orbits the Earth. Half of the Moon's surface is lit by sunlight no matter what the Moon's position. But the amount of the lit surface visible from Earth varies with the Moon's

2. ### Moon Science

What causes the phases of the moon as observed from the Earth? A) Filtering of the light from the moon due to the Earth's atmosphere. B) The tidal forces of the Earth's oceans change the appearance of the moon. C) Change in

3. ### physics

Calculate the magnitudes of the gravitational forces exerted on the Moon by the Sun and by the Earth when the two forces are in direct competition, that is, when the Sun, Moon, and Earth are aligned with the Moon between the Sun

4. ### Science

Which of the following happens during a lunar eclipse A. The Moon lies between earth and sun B. Earth blocks sunlight from reaching the moon surface C. The moon blocks out the sun D. The moon goes into a new moon phase