PHYS 1003 Lecture Notes - Lecture 6: Contact Force, Net Force, Normal Force

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lemonwasp446

12 Oct 2016

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Forces can be classified into two types: When an object is in contact with another object and a force is exerted. A force is exerted at a distance (ie. gravity) Purpose: to identify all forces which act on the object. Draw vectors from the centre of mass representing these forces. If the net force is zero, then the object is in equilibrium. The net force exerted on them is zero. If the forces are two-dimensional, then the forces in x must be in equilibrium and the forces in y must be in equilibrium too. If the net force is zero, then the object must be either: ** if the forces are not directed along the principle axis, we use components to work with them. It is exerted by a solid surface which the object is adjacent to. It prevents an object from passing through another solid object.

Related Questions

Two forces are acting on an object. Which of the following statements is correct?

(a)The object is in equilibrium if the net torque on the object is zero.
(b)The object is in equilibrium if the forces are equal in magnitude and opposite in direction.
(c)The object is in equilibrium if the net force and the net torque on the object are both zero.
(d)The object cannot be in equilibrium because more than one force acts on it.
(e) The object is in equilibrium if the forces act at the same point on the object.

coralfrog788

Two forces are acting on an object. Which of the following statements is correct? (a) The object is in equilibrium if the forces are equal in magnitude and opposite in direction. (b) The object is in equilibrium if the net torque on the object is zero. (c) The object is in equilibrium if the forces act at the same point on the object. (d) The object is in equilibrium if the net force and the net torque on the object are both zero. (e) The object cannot be in equilibrium because more than one force acts on it.

blueworm505

1. Which of the following describes an object with a non-zero netforce acting on it? Choose all that apply.
The moped accelerated while making a left turn.
The motorcycle traveled at a constant speed while making au-turn.
The truck slowed down while making a right turn.
The spaceship traveled at a constant speed in a straightline.
The car sped up from 50 mph to 65 mph while moving in a straightline.

2. If you observe that an object is accelerating, what should youconclude?
A non-zero net force is acting on it. Only forces causeacceleration. As such, if an object is accelerating it must bebecause a non-zero net force is acting on it.
It must be in free fall.
It must be changing direction. Acceleration is a vector and vectorshave both magnitude and direction. Thus if an object isaccelerating it must be changing direction.
The forces acting on the object must be greater than the forces theobject is exerting.
It must be speeding up. If an object is accelerating that means itis speeding up.

3. Which of the following are true according to Newton's 2nd Law?Choose all that apply.

If the acceleration is zero, then the net force is zero.
If you apply the same force to 2 objects, the one with more masswill have a greater acceleration.
If you apply the same force to 2 objects, the one with less masswill have a greater acceleration.
If two objects have the same acceleration, the one with less masswill have a larger net force exerted on it.
If two objects have the same acceleration, the one with more masswill have a larger net force exerted on it.
The larger the net force on an object is, the larger theacceleration.
The larger the net force on an object is, the smaller theacceleration.

4. A box is on the Moon. The box weighs 152 lb and is in free fall.How much force is the box exerting on the Moon and in whatdirection?

lb
Up
Down
Right
North
East
West
Left
South

5. Which of the following are the correct units for mass? Chooseall that apply.
slugs
u
kgÂ·m/s2
g
N
m/s2
oz
lb

6. If an object is traveling in a circle, which of the followingmust be TRUE? Choose all that apply.
The object is slowing down.
The object is speeding up.
The object has a net force acting on it.
The object has a constant velocity.
The object is accelerating.

PHYS 1003 Lecture Notes - Lecture 6: Contact Force, Net Force, Normal Force

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