Accelerations are produced by;
forces
How does the acceleration of an object change in relation to its mass? It is __ prop.
inversely
If the force acting on a cart doubles, what happens to the cart's acceleration?
it doubles
A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is;
the same as the force on the 1-kg book
When a woman stands with 2 feet on a scale, the scale readys 280 N. When she lifts on foot, the scale reads
280 N
Suppose the force of friction on a slidding object is 25 N. The force needed to maintain a constant velocity is
25 N.
A book weighs 4 N. When held at rest in your hands the net force on the book is;
0 N.
A force of 3 N accelerates a mass of 3 kg at the rate of 1 m/s squared. The acceleration of a mass of 6 kg acted upon by a force of 6 N is;
the same
A push in a 1-kg brick accelerates the brick. Neglecting friction, to equally accelerate a 10-kg brick, on would have to push;
with 10 times as much force
Pressure is defined as
force per area
The unit of pressure is called
newtons per square meter (or pascals)
Suppose a cart is being moved by a force. if suddenly a load is dumped into the cart so that the cart's mass doubles, what happens tot the cart's acceleration?
it halves.
You pull horizontally on a 50 kg crate with a force of 450 N and the friction force on the crate is 250 N. What's the acceleration of the crate?
4 m/s squared
The law of inertia states that an object;
�will continue moving at the same velocity unless and outside force acts on it.
�will continue moving in a straight line unless an outside force acts on it
�that is not moving will never move unless acted on by an outside force.
The law of inertia applies to....
both moving and nonmoving objects
A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. The reason this can be done is that
the milk carton has intertia.
One object has twice as much mass as another object. the first object also has twice as much...
inertia
Compared to its weight on Earth, a 10 kg object on the moon will weighh....
less
Compared to its mass on earth, the mass of a 10 kg object on the moon is
the same.
The mass of a sheep that weighs 110 N is about
11 kg
The force required to maintain an object at a constant speed in free space is equal to
zero
A 15 N force and a 45 N force act on an object in opposite directions. What is the net force on the object.
30 N
A girl whose withgt is 500 N hangs from the middle of a bar supported by two vertical strands of rope. What's the tension in each strand?
250 N
Friction is a force that always acts ....
opposite to an object's motion.
What is the max resultant possible when adding a 2 N force to an 8 N force?
10 N.
Which has more mass, a kg of feathers or a kg of iron?
neither- they both have the same mass.
How much does a 3 kg bag of bolts weigh?
29.4 N
A bag of sports equipment has a mass of 10 kg and a weight of ___.
98 N.
A 5 N force and a 30 N force act in the same direction on an object. What is the net fore on the object?
35 N
Whenever an object exerts a force on another object, the second object exerts a force of the...
same size, but in the opposite direction to that of the first object
A high school student hits a nail with a hammer. During the collision, there is a force
on the nail and also on the hammer.
An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the...
arrow's push against the bowstring.
A player hits a ball with a bat. The action force is the impact of the bat against the ball. What is the reaction to this force.
The force of the balll against the bat.
A bug splatters against the windsheield of a moving car. compared to the forcce of the car on the bug, the force of the bug on the car is....
the same.
A large truck and a small car traveling at the same speed have a head-on collision. The fehicle to undergo the greater change in velocity will be...
the small car.
A force is exerted on the tires of a car to accelerate the car along the road. The force is exerted by the....
road.
A rocket is able to accelerate in the vacuum of space when it fires its engines. The force that propels the rocket is the force of...
the exhaust gases on the rocket.
A karate chop delivers a blow of 2300 N to a board that breaks. The force that acts on the hand during this feat is....
2300 N
A woman weighing 550 N sits on the floor. She exerts a force on the floor of
550 N.
A baseball player sings his bat and the bat strikes the ball with a force of 200 N. The ball....
pushes against the bat with a force of 200 N.
Moya learns that fish are propelled through water action-reaction forces. A fish moves by pushing backward on the water with its fins. What's the correct description of the reaction force paired with the force exerted by the fish?
an equal force exerted by the water in a forward direction
In regard to newton's 3rd law, if two moving objectgs collide, what's true about the forces the objects apply on each other?
Both objects apply a force of the same size
Jose likes to paddle his canoe on a river that runs through state park. How does Newton's 3rd law of motion apply as he paddles the canoe?
The canoe moves forward when the water is pushed backwards.