Newton's Laws

These two individuals are pushing a 5500 kg car with a horizontal force of 300 N. What is the Normal Force of the car?

• 53,900 N

• 300 N

• 2940 N

• 30.6 N

Two students that are afraid of the Tardy Terminator are late to class.  They decide to take the elevator even though they are not allow.  Their mass is 40 kg each and the mass of the elevator is 220 kg.  Assume the elevator accelerates upward at 2.00 m/s².  What is the net force that acts on the elevator?

• 300 N

• 160 N

• 2 N

• 600 N

A net force is acting on a 10 kg box produces an accelerate of 3.0 m/s².  What acceleration, to the nearest tenth, will the same net force cause on a 4 kg box? Only type the number.

(a)  

This 75 kg bridge jumper leaped off a 20 m high bridge. Knowing Earth's gravity is acting on him, which statement best represents the reaction force to Earth's gravity?

• Earth is pulling on air with a force of 4.11 x10^4 N.

• Earth is pulling on water with a force of 3.66 x 10^12 N.

• The sun is pulling on Earth with a force of 5.97 x 10^24 N.

• The jumper is pulling on Earth with a force of 735 N.

A net force acting on a 5 kg desk produces an acceleration of 5 m/s^2. What mass, to the nearest tenth, will the same net force cause on a desk accelerating at 12.5 m/s^2. Only type in a number.

(a)  

This guy, who may or may not be Spiderman, jumps off a building to stop Green Goblin. His mass is 55 kg. Superheroes are subject to Earth's gravity. Which statement best describes the reaction force to Earth's gravity in this situation?

• Earth is pulling on the sun with a force of 5.97 x 10^24 N.

• Earth is pulling on Spiderman wannabe with a force of 539 N.

• Earth is pulling on air with a force of 5.61 x10^ 5 N.

• Earth is pulling on Green Goblin with a force of 4.99 x 10^7 N.

These two chaps are moving this 200 kg box with a horizontal force of 600 N. What is the magnitude of the Normal Force?

• 5880 N

• 600 N

• 1960 N

• 61 N

What is the amount of force needed to accelerate a 2 kg object at 10 m/s^2? Type only a number

(a)  

A vendor and his hot dog cart are in an elevator at AT&T Stadium.  The vendor has a mass of 50 kg and his cart is 20 kg, hot dogs included.  The elevator has a mass of 300 kg.  The elevator accelerates upwards at 1 m/s².  What is the upward force acting on the elevator?

• 70 N

• 370 N

• 300 N

• 9.8 N

What is the amount of force required to accelerate a 10 kg object at 20 m/s^2? Only type a number.

(a)