If this car is accelerating, what must be true?

There must be an unbalanced force in the direction of motion

What does Newton's 1st Law state?

An object that's in motion or at rest stay the same.

All of the following are true about weight EXCEPT

Weight is how much matter something contains

If the net force is zero, the object is either...

Not moving or moving at a constant speed

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Physics of Forces Newton's Laws

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Physics problems involving forces, acceleration, and Newton's first two laws

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Questions 17

Answers

1
What is the net force on the object...
11 N (to the right)
-5 N (to the left)
-11 N (to the left)
5 N (to the right)
2
What is the net force on the log?
200 N
0 N
-400 N
400N
3
If this car is accelerating, what must be true?
There are no forces present
There must be an unbalanced force in the direction of motion
F friction and F air resistance are bigger than F engine.
All forces must be balanced
4
If a box is moving at 4 m/s² with a force of 10 N, what is the mass of the box?
2.5 kg
.4 kg
40 kg
14 kg
5
A unit for acceleration is...
km
km/hr
m/s2
m/s
6
If a 20 kg dog is accelerates from 1 m/s to 3 m/s in 4 seconds, what is the force required?
160 N
80 N
10 N
40 N
7
What does Newton's 1st Law state?
For every action, there is an equal and opposite reaction.
expressing the relation between force, mass and acceleration
An object that's in motion or at rest stay the same.
Force is dependent on mass
8
What is a force?
distance traveled by an object
The speed of an object in a particular direction
When an object's speed or direction do not change
a push or pull
9
All of the following are true about weight EXCEPT
Weight is how much matter something contains
Weight is a force
Weight is measured in Newtons
Weight = mass x gravity
10
A 15 N force acts on a 60 kg person sitting in a rolling chair. What is his speed after 10 sec?
2.5 m/s
40 m/s
.025 m/s
90 m/s
11
If your acceleration is constant and you double the mass...
the force required must stay the same
the force required must double
The force required will decrease by half
The force required cannot be determined
12
What is the acceleration on this 30 kg car?
.167 m/s2
35 m/s2
150 m/s2
6 m/s2
13
F net would be...
- 20 N
6 N
20 N
-6 N
14
Describe the motion based on the arrows
no motion
decelerate
constant speed
accelerate
15
If the net force is zero, the object is either...
Not moving or moving at a constant speed
Accelerating or not moving
Decelerating or moving at a constant speed
accelerating or deaccelerating
16
What is the tendency of an object resisting to be stopped?
Work
Inertia
Air resistance
Force
17
A 20 N force acts on a 10 kg sled, how fast will it be going in 3 seconds?
6 m/s
1.5 m/s
600 m/s
.667 m/s

Physics of Forces Newton's Laws Flashcards | StudBud