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Intermediate
Mathematical
GQ

At what distance from the Earth will a spacecraft traveling directly from the Earth to the Moon experience zero net force because the Earth and Moon pull in opposite directions with equal force?

Beginner
Mathematical
GQ

Two students start \( 100 \) \( \text{m} \) apart.

• Student A walks to the right at \( 2 \) \( \text{m/s} \).

• Student B walks to the left at \( 3 \) \( \text{m/s} \).

At what time do the students meet, and how far has each student walked when they collide?

Beginner
Mathematical
GQ

A person stands on a scale in an elevator. If the scale reads \( 600 \, \text{N} \) when that person is riding upward at a constant velocity of \( 4 \, \text{m/s} \), what is the scale reading when the elevator is at rest? Hint: The reading on the scale is simply the normal force.

Beginner
Conceptual
MCQ

A westward–moving car is changing its speed. The net force on the car ____.

Intermediate
Mathematical
GQ

A person is trying to judge whether a picture (mass = 1.42 kg) is properly positioned by temporarily pressing it against a wall. The pressing force is perpendicular to the wall. The coefficient of static friction between the picture and the wall is 0.62. What is the minimum amount of pressing force that must be used?

Beginner
Conceptual
GQ

Why do you push down harder on the pedals of a bicycle when first starting out than when moving at constant speed? Why do you need to pedal at all when cycling at constant speed?

Intermediate
Mathematical
MCQ

A force \(F\) is exerted by a broom handle on the head of a broom, which has a mass \(m\). The handle is at an angle \(\theta\) to the horizontal. The work done by the force on the head of the broom as it moves a distance \(d\) across a horizontal floor is

Beginner
Conceptual
GQ

Suppose you place a ball in the middle of a wagon, and then accelerate the wagon forward. Describe the motion of the ball relative to the ground. Describe its motion relative to the wagon.

Beginner
Mathematical
GQ

A \( 6.00 \, \text{m} \) long, \( 500 \, \text{kg} \) steel uniform beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A \( 70 \, \text{kg} \) construction worker stands at the far end of the beam. What is the magnitude of the torque about the bolt due to the worker and the weight of the beam?

Advanced
Conceptual
GQ

The gravitational force that the Moon exerts on Earth is often cited as the source of the tides we witness. However, the gravitational force the Sun exerts on Earth is over \(100\) times greater than the force the Moon exerts on Earth.

Why is the force from the Moon credited for the tides, and not the force from the Sun?

Intermediate
Conceptual
MCQ

Two balls are thrown off a building with the same speed, one straight up and one at a 45° angle. Which statement is true if air resistance can be ignored?

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