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grade 7 newtons Laws and Forces Review Flashcards | StudBud
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grade 7 newtons Laws and Forces Review
grade 7 newtons Laws and Forces Review
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A #physics quiz reviewing #forces, #Newton's laws and #Freebodydiagrams
Flashcards
25 cards
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Questions
25
Answers
1
A space shuttle flings a rock in outer space. After it leaves the shuttles claw, the rock will…
Continue at a constant velocity
Continue to accelerate because of the force it was given
Slow down to a stop
2
Newtons third law implies that if Andrey pushes on a skateboard...
the skateboard will push on Andrey but with less force
the skateboard pushes Andrey with an equal amount of force
The skateboard will not accelerate
The skateboard will accelerate at the same rate as Andrey
3
Newtons second law involves which quantities?
Mass, force, and acceleration
Mass, force and velocity
Speed and distance
Inertia and mass
4
In what direction does the normal force act?
Parallel to the surface
Always opposite the force of gravity
Always straight up
Perpendicular to the surface
5
What is momentum?
Change in velocity
Amount of strength or force that something has when moving
Objects tendency to keep doing what its doing
A moment
6
What force must be applied to a 25000 kg airplane to accelerate it at 5 m/s/s?
25005 N
125000 N
.0002 N
5000 N
7
A crash dummy flew through the window of a car when it crashed. This is an example of...
Newton's 1st law
Newton's 3rd law
Newton's 2nd law
8
Newton's first law states that objects at rest tend to stay at rest unless...
acted upon by an inside force
Objects at rest don't tend to stay at rest.
Acted upon by an outside force
acted upon by a balanced force
9
How to calculate Force
Mass times Acceleration
Distance over time
final velocity minus initial velocity over time
Mass times Velocity
10
On a free body diagram, the direction of gravity is
Always straight down
Dependent on the slant of the ground
Dependant on the direction of the normal force
To the left
11
If Danny applies 35 N of force to a 50 kg cart, how fast will it accelerate?
1750 m/s/s
85 m/s/s
0.7 m/s/s
1.43 m/s/s
12
What is the correct unit for acceleration?
m/s
N
m/s/s
kg
13
What types of forces are acting on a sled sliding along the ground, pulled by a rope?
Gravity, friction, normal, and tension
Gravity only
Gravity and tension
Gravity, normal, and friction
14
Dana pushes on a curling rock with 75N of force. It accelerates at 3m/s/s. What is its mass?
0.04 kg
25 kg
78 kg
225 kg
15
How is momentum conserved?
When 1 object equals the gain in momentum of another object
When 2+ object equals the gain in momentum of another object
16
What would be the acceleration of a 15 kg ball pushed with 30 N of force?
450 m/s/s
45 m/s/s
0.5 m/s/s
2 m/s/s
17
What types of forces are acting on this object?
Gravity and applied
Normal and tension only
Gravity, tension, and normal
Gravity and tension only
18
What is the correct unit for force?
m/s
m/s/s
N
kg
19
How do you calculate acceleration ?
Change in velocity / total time
displacement / time
distance / time
time / velocity
20
A car accelerates at 6 m/s/s. Are the forces on this car balanced?
Not enough information
Yes
No
21
What is momentum
M=tv
M=10
M=dv
M=mv
22
If lamar yanks a tablecloth out from under a book, the book will not move because it has
Inertia
Constant velocity
A force keeping it in place
23
True or false: Inertia is a force
True
False
24
What types of forces are acting on a child sliding down a slide?
Gravity, normal, and friction
Gravity, applied, and normal
Gravity, tension, and friction
Gravity only
25
When do we know to use the force of tension?
We can never know
When there is a surface
When there is gravity
When there is a rope, string, or chain
