Newton's Laws
Two students are pushing on a box in opposite directions, one with a force of 20 N to the right and the other with a force of 13 N to the left. What is the net force?
7 N to the right.
What net force is required to accelerate a car at a rate of 2 m/s2 if the car has a mass of 3,000 kg?
6,000 N
Seatbelt stops you from hitting the windshield if you hit the brakes quickly. Which of Newton's Laws does this explain?
1st Law (Inertia)
A student sits on a chair and the chair does not break.
Normal Force
Two equal forces that are pushing on an object in opposite directions are called _______________.
Balanced Forces
A child pulls back the pocket on a slingshot and shoots a marshmallow at his friend. What type of force does this demonstrate?
Elastic Force
Two teams play tug of war and the rope does not break.
A person with a weight of 200 pounds on the Earth will weigh _________ on a planet with a stronger pull of gravity.
more
A 4.3 kg box is pushed with a force of 40N. What is the box's acceleration?
9.3 m/s^2
Team A pulls a rope with a force of 20 N in one direction, while Team B pulls the same rope with a force of 35 N in the opposite direction. What is the net force and who wins?
15 N, Team B
A toy car rolls across the floor and slows to a stop.
Rolling Friction
It takes less force to push a bike than a motorcycle. Which of Newton's Laws does this demonstrate?
Newton's Second Law
Even though she is way ahead of you, Sally switches her car to run on nitrous oxide fuel. The nitrous oxide allows her car to develop 10,000 N of force. What is Sally's acceleration if her car has a mass of 500 kg?
20 m/s^2
A real car moving at 10 km/h has more force than a toy car moving at the same rate because:
The real car has a greater mass.
Two students push a box with a net force of 40 N, while friction pushes against them with a force of 50 N. What is the net force? Does the box move?
10 N, No