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Gravity
Terms in this set (32)
True Force
is the ability to change motion. True Or False
True mass
A measure of the amount of matter in an object True Or False
True Weight
A measure of the force of gravity on an object True Or False
False Friction
A moving object slows to a stop because of compression
True or false
False Larger
The greater the force squeezing 2 surfaces together, the __Smaller__the friction force True Or False
True reduces
Lubrication reduces the friction between machine parts True Or False
False Unbalanced
A zero net force causes an acceleration.
true or false
False balanced
If an object is at rest, the net force on it must be unbalanced
True or false
Newton
The metric unit of force preferred by scientists is the
Gravity
Attractive force between two objects that depends on the masses of the objects and the distance between them.
l
l
v
Which of the following diagrams shows the force vector -2 N?
5 kilograms
What is the mass of a rock that weighs 49 newtons?
The 6 kg stack has twice the weight of the 3 kg stack.
The diagram shows two stacks of books of that has a mass of 3 kg and 6 kg. How do their weights compare?
61.2 kg
Brandon weighs 600. newtons. What is his mass?
Force
Of the following measurements, the one that would be incomplete without giving a direction is:
The length of the arrow indicates the strength of the force.
A vector, such as force, can be represented by drawing an arrow. Which of the following statements is CORRECT?
7.0 N
On a vector drawing, Alexi decides to use a scale of 1.0 cm = 2.0 N. The force represented by an arrow 3.5 cm long would be:
acceleration and force
Which pair of terms are vectors?
5 N
Two identical springs are shown in the picture above. If the first spring exerts a force of 10 N when stretched 10 cm, what is the force exerted by the second spring when stretched 5 cm?
Sliding friction
A force that resists the motion of an object moving across a surface is called:
static friction
The friction force that resists the motion between two surfaces that are not moving is called:
friction
A force that resists motion is called:
8 N
As a box is sliding down a ramp, a 10-N force of gravity is pulling the box down the ramp while a 2-N force of friction acts to stop the box. What is the net force accelerating the box down the ramp?
increasing the weight on you foot
As a box is sliding down a ramp, a 10-N force of gravity is pulling the box down the ramp while a 2-N force of friction acts to stop the box. What is the net force accelerating the box down the ramp?
increase the friction between your foot and the ground.
The tread on the bottom of your sneakers is designed to:
By separating surfaces with a lubricant.
How can the force of friction between two surfaces be reduced?
turn.
maintain constant speed.
slow down.
stop moving.
B. Maintaining constant speed
A net force must be applied to an object to do all of the following EXCEPT:
is in equilibrium
When the forces on an object are balanced, we say that the object:
0 N
In the picture below, a girl is sitting motionless on a swing. What is the net force on the girl?
slows down
The picture below shows 4 forces applied to an airplane.
In order for the box to move at a constant velocity, it must be in equilibrium with a net force of zero. Therefore, the force F pulling to the left must balance the 6 N force pulling to the right.
The diagram below represents an object moving to the right with a constant velocity.
What is the value of force F
The net force is zero. All the forces cancel out: There are 10 N pushing to the right and 10 N pushing to the left. There are 6 N pushing up and 6 N pushing down.
This box is being acted upon by forces in the up, down, left, and right directions. Calculate the net force on the box shown in
;