Physics Final

A 5 Newton net force is applied to a 50 kg box. What is the acceleration of the box?

0.1 m/s2

Newton's First Law

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Two rollercoasters were just built at Six Flags Physics Phunland. The first coaster (Newton's Revenge) has a main drop that is twice as tall as the drop on a second coaster (The Momentum Mover). Which of the following statements is true?

At the bottom of the first drop, Newton's Revenge will have twice the kinetic energy of the Momentum Mover

Two spheres of identical shape are suspended in the air at the same height. One sphere is made of a heavy metal, and the other a lightweight plastic. Both spheres are dropped at the same time. What happens?

Both spheres hit the ground at the same time.

A 1000 kg automobile is driving north with a velocity of 25 mph. A 0.003 kg bug is flying south along the same road. They collide and the bug hits the windshield. What happens?

Both the bug and automobile experience the same force.

Egg "A" is thrown at a brick wall and splatters. Egg "B" is thrown at a hanging bed sheet and comes to a rest in tact (without breaking). Which of the following statements is true.

Egg "A" experiences a greater force due to decreased time of impact.

Newton's third law

For every action there is an equal and opposite reaction

Newton's Second Law

Force = mass x acceleration

Susie Jumprock and Jeff Watersplash are cliff divers. The both run horizontally off of a 30 meter cliff. Susie runs twice as fast as Jeff. Which of the following statements is true?

Susie and Jeff will hit the water at the same time.

A 1000 kg automobile is driving north with a velocity of 25 mph. A 0.003 kg bug is flying south along the same road. They collide and the bug hits the windshield.

The bug experiences a greater acceleration.

An elevator is experiencing an upwards force of 400 Newtons and a downwards force of 400 Newtons. Which of the following scenarios could be true?

The elevator is moving with a constant velocity or The elevator is not moving

Which of the following determines how long a projectile is in the air?

The height the object reaches

Mr. Likestodrive takes his trusty Mustang "Cobra" to the stunt track to work on his understanding of physics. He drives the car with a constant velocity backwards, and then hits the brakes to slow down. Which direction is the car accelerating?

accelerating forwards

In an accident, a car with air bags is safer than a car with a stiff dashboard because with an airbag, an occupant experiences...

both an increased time of impact and decreased impact force

impulse =

change in momentum

Work

force x distance

momentum

mass x velocity

Two spheres are dropped from a balcony. Sphere A is twice as heavy as sphere B. When they are dropped simultaneously, they reach the ground at the same time but Sphere "A" will have a greater...

momentum

A bowling ball is rolled horizontally off the edge of a table. As it falls, what happens to the horizontal component of its velocity?

remains constant

Olympic indoor cycling takes place on an oval track called a velodrome. In one location, the track is 50 meters and athletes complete 5 laps. If the athletes finish the race at the same place they started, which of the following statements is true?

the displacement of the racers is zero

Once a rocket leaves the ground, the force required to accelerate the rocket gets progressively less as it travels upward. This is primarily because...

the mass of the rocket decreases as fuel is burned off

A hockey puck is set in motion across a frozen, frictionless pond. If the puck is already in motion, what force is required to keep the puck in motion?

zero newtons