Types of Radioactive Decay — Unit test Answers

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is the displacement of an object during a specific unit of time.

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Which describes what a velocity/time graph would look like with no acceleration?

A
curved line on a upward slope
B
straight line on a downward slope
C
straight line with zero slope
D
curved line on a downward slope
3

An object in projectile motion will follow which path?

A
curved up from the ground
B
curved down toward the ground
C
straight down toward the ground
D
straight up from the ground
5

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

A
“force” and “acceleration”
B
“inertia” and “force”
C
“action” and “reaction”
D
“mass” and “inertia”
6

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?

A
An upward force balances the downward force of gravity on the skydiver.
B
The skydiver’s inertia is zero, which no longer allows for acceleration.
C
An unbalanced force pulls the skydiver toward the ground.
D
The mass of the skydiver is so great that there is no acceleration.
7

Which may result from an increase in friction?

A
decreased traction
B
increased speed
C
reduced wear and tear
D
generation of heat
8

Which factors can affect the amount of friction acting on an object on a solid surface?

A
the weight of the object and the force of a push
B
the type of surface and the weight of the object
C
the force of a push and the motion of the object
D
the motion of the object and the type of surface
9

How is speed calculated?

A
multiply velocity by displacement
B
divide velocity by displacement
C
multiply distance by time
D
divide distance by time
10

The graph shows two runners participating in a race.

Question illustration
A
Daniela had a 5 meter head start, and Leonard caught up to her at 25 meters.
B
Daniela ran faster than Leonard through the entire race.
C
Daniela gave Leonard a 5 meter head start and caught up to him at 25 meters.
D
Daniela ran slower than Leonard, but she went faster at the end.
13

Which statement correctly describes gravity?

A
an attractive force that acts between all objects through contact
B
an attractive force that acts between all objects without contact
C
a repulsive force that acts between all objects through contact
D
a repulsive force that acts between all objects without contact
14

While drilling metal, Ben poured oil over the area. Which best explains why he did this?

A
Ben was trying to reduce fluid friction.
B
Ben was trying to reduce kinetic friction.
C
Ben was trying to increase fluid friction.
D
Ben was trying to increase kinetic friction.
15

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

A
removing the outer layer of the baseball
B
moving the balls farther apart
C
wrapping the soccer ball in layers of duct tape
D
using a baseball with a thinner leather
16

Hunter’s velocity was 4.5 m/s. At the end of his race, his velocity was the same. Which best describes his movement?

A
His movement stopped.
B
His acceleration is zero.
C
His time was constant.
D
His acceleration was positive.
18

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
A rolling ball eventually slows down and comes to a stop.
B
A wagon must be pushed before it begins to move.
C
The heavier the load in a cart, the harder the cart is to turn.
D
A box does not move when pushed equally from opposite sides.
19

Which is an example of sliding friction?

A
a car’s wheels rolling down the road
B
a bird flying through the air
C
a child applying the brakes on his bike
D
a bowling ball rolling down a lane
21

Olivia bought new gym shoes to play volleyball because she kept slipping when she ran in her old shoes. How will the new soles help solve the problem?

A
by increasing her speed to increase friction
B
by adding surface roughness to increase friction
C
by improving aerodynamics to decrease friction
D
by increasing lubrication to decrease friction

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