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

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

Q: A $$5\ \text{kg}$$ block is pulled to the left with $$15\ \text{N}$$ and to the right with $$5\ \text{N} at $$the same time. What is the net force?

$$10\ \text{N}$$\ \text{to the left}$

Q: A ball tossed vertically upward reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always:

$$9.8\ \text{m/s}^2$$\ \text{downward}$

Question 1

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

Accepted Answer

$$0\ 	ext{N}$$

Question 2

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

Accepted Answer

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

Question 3

When a tablecloth is quickly yanked beneath dishes resting on a table, which concept is being illustrated?

Accepted Answer

$$	ext{Inertia}$$

Question 4

A car accelerates from rest at $$2\ 	ext{m/s}^2$$ for $$3$$ seconds. What is its final speed?

Accepted Answer

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

Question 5

A ball is dropped from a height of $$2.5\ 	ext{m}$$ and strikes the ground $$1\ 	ext{s}$$ later. What is the acceleration of fall?

Accepted Answer

$$9.8\ 	ext{m/s}^2$$

Question 6

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

$$	ext{Halves}$$

Question 7

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

Accepted Answer

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

Question 8

A $$10\ 	ext{kg}$$ block with an initial velocity of $$10\ 	ext{m/s}$$ slides $$10\ 	ext{meters}$$ 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

$$25\ 	ext{N}$$

Question 9

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

Accepted Answer

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

Question 10

If a car increases its velocity from zero to $$60\ 	ext{m/s} in$$ $$10$$ seconds, its acceleration is:

Accepted Answer

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

Question 11

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

Accepted Answer

$$6\ 	ext{N}$$

Question 12

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

Accepted Answer

$$0\ 	ext{N}$$

Question 13

A $$2\ 	ext{kg}$$ block of solid iron has twice as much ______ as a $$1\ 	ext{kg}$$ block of solid iron.

Accepted Answer

$$	ext{Mass}$$

Question 14

Compared to the mass of an apple on Earth, the mass of the apple on the Moon is:

Accepted Answer

$$	ext{The same}$$

Question 15

A constant net force on a rail-road car produces constant:

Accepted Answer

$$	ext{Acceleration}$$

Question 16

A $$5\ 	ext{kg}$$ block is pulled to the left with $$15\ 	ext{N}$$ and to the right with $$5\ 	ext{N} at $$the same time. What is the net force?

Accepted Answer

$$10\ 	ext{N}$$\ 	ext{to the left}$

Question 17

A ball tossed vertically upward reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always:

Accepted Answer

$$9.8\ 	ext{m/s}^2$$\ 	ext{downward}$

Question 18

If the velocity of a car is tripled, the car's acceleration:

Accepted Answer

$$	ext{Remains unchanged}$$

Question 19

A $$100\ 	ext{kg}$$ grocery cart has a mass of $$10\ 	ext{kilograms}$$ weighs about:

Accepted Answer

$$100\ 	ext{N}$$

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