Answers TX-Integrated Physics and Chemistry B-CRUnit Test

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When discussing Newton’s laws of motion, which terms do people most likely use when talking about Newton’s third law of motion?

“force” and “acceleration”

“inertia” and “force”

“action” and “reaction”

“mass” and “inertia”

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Jerome solves a problem using the law of conservation of momentum. What should Jerome always keep constant for each object after the objects collide and bounce apart?

velocity

mass

momentum

direction

Which refers to the force that one massive object exerts to attract another object?

velocity

gravity

acceleration

newton

Which example best represents balanced forces?

an elevator stopped on the third floor

a basketball shot into a hoop

a sled sliding down a snowy hill

a tow truck pulling a car out of a ditch

The resulting net force of an object is represented below. →10 NWhich most likely represent the forces acting on the object?

↑ 63 N and ↓ 73 N

↑ 97 N and ↓ 87 N

← 63 N and → 73 N

← 97 N and → 87 N

Newton’s first law of motion was a giant leap forward in scientific thought during Newton’s time. Even today, the idea is sometimes difficult at first for people to understand.

A rolling ball eventually slows down and comes to a stop.

A wagon must be pushed before it begins to move.

The heavier the load in a cart, the harder the cart is to turn.

A box does not move when pushed equally from opposite sides.

A bicycle has a momentum of 36 kg • m/s and a velocity of 4 m/s. What is the mass of the bicycle?

9 kg

32 kg

40 kg

144 kg

Which change will cause the gravitational force between a baseball and a soccer ball to increase?

removing the outer layer of the baseball

moving the balls farther apart

wrapping the soccer ball in layers of duct tape

using a baseball with a thinner leather

The chart lists the masses and velocities of four objects.

Anya knows the velocity of an object. What else does she need to know in order to find the object’s momentum?

its mass

its height

its density

its speed

An object in projectile motion will follow which path?

curved up from the ground

curved down toward the ground

straight down toward the ground

straight up from the ground

An object has a mass of 5 kg. What force is needed to accelerate it at 6 m/s2? (Formula: F=ma)

0.83 N

1.2 N

11 N

30 N

A skydiver falls toward the ground at a constant velocity. Which statement best applies Newton’s laws of motion to explain the skydiver’s motion?

An upward force balances the downward force of gravity on the skydiver.

The skydiver’s inertia is zero, which no longer allows for acceleration.

An unbalanced force pulls the skydiver toward the ground.

The mass of the skydiver is so great that there is no acceleration.

Which statement correctly describes gravity?

an attractive force that acts between all objects through contact

an attractive force that acts between all objects without contact

a repulsive force that acts between all objects through contact

a repulsive force that acts between all objects without contact

Which refers to the sum of all the forces that act upon an object?

absolute force

net force

positive force

balanced force

Which would be represented by FN on a force diagram?

Northern Force

Newton Force

Normal Force

Negative Force

A bowling ball has a mass of 7.2 kg and a weight of 70.6 N. It moves down the bowling alley at 1 m/s and strikes a pin with a force of 15.0 N. What is the force that the pin exerts on the bowling ball?

7.2 N

15.0 N

70.6 N

85.6 N

Which best describes two counteracting forces on an object?

using a dolly to push a box to another location

two children pulling apart a wishbone

a group of dogs pulling a dogsled across ice

two people pushing a broken-down car up the road

How do Newton’s laws of motion explain why it is important to keep the ice smooth on a hockey rink so that players can pass a puck as quickly as possible?

Smooth ice reduces the inertia of the hockey puck.

Smooth ice increases the force used to accelerate the hockey puck.

Smooth ice reduces the unbalanced forces that would slow the hockey puck.

Smooth ice decreases the reaction force that the ice exerts on the hockey puck.

Which best explains parallel forces?

left and right forces that can be added together

right and upward forces that cancel each other out

addition of parallel forces that cannot result in a negative force

left and downward forces that cancel each other out

A ball is thrown forward at 5 m/s.

The ball would follow a curved path on Earth but a straight path on the moon.

The ball would follow the same curved path on Earth as on the moon.

The ball would curve down more sharply on Earth than on the moon.

The ball would curve down on Earth but curve up on the moon.

Rahul sits in a chair reading a book. Which force is equal to the force Rahul exerts on Earth?

Rahul’s weight

Rahul's mass

the sum of the weights of Rahul and the book

the sum of the weights of the chair, Rahul, and the book

A car has a momentum of 20,000 kg • m/s. What would the car’s momentum be if its velocity doubles?

10,000 kg • m/s

20,000 kg • m/s

40,000 kg • m/s

80,000 kg • m/s

Polly is pushing a box to the right across the floor with a force of 30 N. The force of gravity is 8 N, and the normal force is 8 N. Which value could describe the force of friction if Polly could not move the box?

Option

Why are objects that fall near Earth’s surface rarely in free fall?

Gravity does not act on objects near Earth’s surface.

Air exerts forces on falling objects near Earth’s surface.

The objects do not reach terminal velocity.

The objects can be pushed upward by gravity.

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