Which is not expecting acceleration? A point on the outside of a spinning top whose rotational speed is constant. A skydiver whose air resistance is equal to that of her weight. A car on the freeway experiencing a net force of -120 N. A submerged beach ball whose buoyant force is eight times the force of gravity on it. Which is not considered to be a contact force? Gravity(my choice) Spring Normal Tension Which is the definition of inertia?

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GuessWhosBackBaby

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Which is not expecting acceleration?
A point on the outside of a spinning top whose rotational speed is constant.
A skydiver whose air resistance is equal to that of her weight.
A car on the freeway experiencing a net force of -120 N.
A submerged beach ball whose buoyant force is eight times the force of gravity on it.

Which is not considered to be a contact force?
Gravity(my choice)
Spring
Normal
Tension

Which is the definition of inertia?
The tendency an object has to accelerate.
A quanitive measurement of mass.
The tendency of an object’s motion to remain the same(my choice)
A qualitive measurement of mass
A man pushes with a force of 310 N on a box at an angle of 55 degrees to the floor. How much of the force is directed into the floor, making his job more difficult?
178 N(my choice)
254 N
300 N
150 N

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ariston

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1. Answer: A skydiver whose air resistance is equal to that of her weight.
A skydiver free falls under gravity but her rate of fall slows down due to drag -air resistance. when this air resistance becomes equal to her weight, the two get balanced and the body does not accelerate or decelerates.
2. Answer: Gravity
Contact forces are those which act when there is physical contact between two bodies. For example: normal force, tension and spring force.
Non-contact forces act between two bodies even when they are at a distance apart. For example: gravity, electric force, magnetic force etc.
3. Answer: The tendency of an object's motion to remain the same.
Inertia is a property of matter by virtue of which it tends to remain in its state of motion or rest. It does depend on mass of the object, more the mass, more is inertia. For example, cycle can be easily moved but we need real push hard for a car to move.
4. Answer: 254 N
The man pushes the box with 310 N force at an angle of 55 degrees to the horizontal.
we can write this in terms of horizontal ( $F cos \theta$ )and vertical component ( $F sin\theta$ ).
Horizontal component: $F_H=310 \times cos (55^o)= 178 N$
Vertical component: $F_v=310 \times sin (55^o)= 254 N$
The vertical component would act towards the floor making the job more difficult to move the job.
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