Q: If gravity between the Sun and Earth suddenly vanished, Earth would continue moving in

$$\text{a straight-line path}$$

Q: A mobile phone is pulled northward by a force of $$10\ \mathrm{N}$$ and at the same time pulled southward by another force of $$15\ \mathrm{N}. $$The resultant force on the phone is

$$5\ \mathrm{N}$$\ \text{southward}$

Question 1

A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is

Accepted Answer

$$0$$

Question 2

If gravity between the Sun and Earth suddenly vanished, Earth would continue moving in

Accepted Answer

$$	ext{a straight-line path}$$

Question 3

A package falls off a truck that is moving at $$30\ \mathrm{m/s}. $$Neglecting air resistance, the horizontal speed of the package just before it hits the ground is

Accepted Answer

$$30\ \mathrm{m/s}$$

Question 4

If your automobile runs out of fuel while driving, the engine stops. You don't come to an abrupt stop due to

Accepted Answer

$$	ext{inertia}$$

Question 5

A mosquito flying at $$3\ \mathrm{m/s}$$ that encounters a breeze blowing at $$3\ \mathrm{m/s} in $$the same direction has a speed of

Accepted Answer

$$6\ \mathrm{m/s}$$

Question 6

A car increases its velocity from zero to $$60\ \mathrm{m/s} in$$ $$10$$ seconds. Its acceleration is

Accepted Answer

$$6\ \mathrm{m/s^2$}$$

Question 7

A ball is dropped from a $$5\ \mathrm{m}$$ height and accelerates at $$10\ \mathrm{m/s^2$}$$ and strikes the ground $$1$$ second later. If the ball is dropped from a height of $$2.5\ \mathrm{m}$$, its acceleration of fall is

Accepted Answer

$$10\ \mathrm{m/s^2$}$$

Question 8

A $$10\ \mathrm{kg}$$ block with an initial velocity of $$10\ \mathrm{m/s}$$ slides $$10$$ meters across a horizontal surface and comes to rest. It takes the block $$2$$ seconds to stop. The stopping force acting on the block is about

Accepted Answer

$$50\ \mathrm{N}$$

Question 9

If the net force on a cart is quickly loaded to have twice the mass while a propelling force remains constant, the cart's acceleration

Accepted Answer

$$	ext{is halved}$$

Question 10

A $$10\ \mathrm{N}$$ falling object encounters $$4\ \mathrm{N} of $$air resistance. The net force on the object is

Accepted Answer

$$6\ \mathrm{N}$$

Question 11

A $$10\ \mathrm{N}$$ falling object encounters $$10\ \mathrm{N} of $$air resistance. The net force on the object is

Accepted Answer

$$0\ \mathrm{N}$$

Question 12

A mobile phone is pulled northward by a force of $$10\ \mathrm{N}$$ and at the same time pulled southward by another force of $$15\ \mathrm{N}. $$The resultant force on the phone is

Accepted Answer

$$5\ \mathrm{N}$$\ 	ext{southward}$

Question 13

A $$10\ \mathrm{kg}$$ object is acted on by a constant net force of $$20\ \mathrm{N}. $$What is its acceleration?

Accepted Answer

$$2\ \mathrm{m/s^2$}$$

Question 14

If the force of friction on a sliding object is $$10\ \mathrm{N}$$, the applied force needed to maintain a constant velocity is

Accepted Answer

$$10\ \mathrm{N}$$

Question 15

A $$2\ \mathrm{kg}$$ block is pulled horizontally with a force of $$10\ \mathrm{N}$$ across a surface with a frictional force of $$6\ \mathrm{N}. $$What is the acceleration of the block?

Accepted Answer

$$2\ \mathrm{m/s^2$}$$

Question 16

A $$10\ \mathrm{kg}$$ block is suspended by a vertical rope. What is the tension in the rope if the block is at rest?

Accepted Answer

$$98\ \mathrm{N}$$

Question 17

If a freely falling object were equipped with a speedometer on a planet where the acceleration due to gravity is $$20\ \mathrm{m/s^2$}$$, then its speed reading would increase each second by

Accepted Answer

$$20\ \mathrm{m/s}$$

Question 18

A $$100\ \mathrm{kg}$$ box is dragged without acceleration in a straight-line path across a level surface by a force of $$60\ \mathrm{N}. $$What is the force of friction between the block and the surface?

Accepted Answer

$$60\ \mathrm{N}$$

Question 19

A $$5\ \mathrm{kg}$$ object is acted on by a net force of $$20\ \mathrm{N}. $$What is its acceleration?

Accepted Answer

$$4\ \mathrm{m/s^2$}$$

Fundamentals of Newtonian Mechanics: Kinematics and Dynamics Study Guide

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