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A small plane has a mass of 2000 kg and accelerates at 15 m/s2 down the runway. What is the magnitude of the force acting on the plane?
A 5.0 kg block is on a frictionless horizontal surface. F1 = 7.0 N and pulls to the left. F2 = 15.0 N and pulls to the right. What is the acceleration (magnitude and direction) of the block?
A wagon is pulled with a constant force by a child. While it is being pulled, another small child is continuously pouring sand into the wagon. How is the acceleration of the wagon affected? Explain.
Cart 1 has a mass of 2 kg. Cart 2 has a mass of 4 kg. They are pushed apart by a spring. The spring exerts 5 N of force onto cart 1. How much force is exerted onto cart 2?
Driving along one day, a giant beetle splatters against my windshield. Which is greater, the force acting on the windshield or the force acting on the beetle?
True or False: In order to make a wagon move forward, a horse must pull harder on the wagon than the wagon pulls on the horse.
A mass of exactly 40 kg is sitting on a flat wooden board. A spring scale is attached to the mass. A reading of 250 N is needed to just start to drag the mass over the board.
Objects maintain their states of motion (rest; constant velocity) unles acted upon by a net external (outside) force
An objects resistance to changes in motion.
Apply an external force.
Inertia.
ex) object at rest; object with constant velocity; etc.
F = ma
Force is the product of mass and acceleration.
30,000 N
It is accelerating (changing velocity).
8N, to the right.
Acceleration decreases. F = ma. If Force remains constant and mass increases, then acceleration must decrease. m and a are inverse.
Forces come in pairs; when one object exerts a force on another object, the second object also exerts an equal (magnitude) and opposite (direction) force on the 1st object.
ex. normal force, etc
5N; Spring pushes cart 1 with 5N, cart 1 pushes back with 5N, spring therefore will push 5N on car 2 as well.
Trick! Both the same!
FALSE!
The horse pushes on the ground and in turn the ground pushes on the horse propelling it forward.
Static Friction.
The friction that occurs when objects slide against each other.
a) 250 N
b) 400N
c) 0.6
ex) roughness of surface, temperature, dry/wet, grease/lubricant.
0.5
Force of friction is equal to force applied because the box just started to move. Normal force is the mass (10 kg) multiplied by acceleration due to gravity (9.8 m/s2). Coefficient of friction is Force of friction divided by the normal force (50 N/100 N).