forces
Accelerations are produced by;
inversely
How does the acceleration of an object change in relation to its mass? It is __ prop.
it doubles
If the force acting on a cart doubles, what happens to the cart's acceleration?
the same as the force on the 1-kg book
A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is;
280 N
When a woman stands with 2 feet on a scale, the scale readys 280 N. When she lifts on foot, the scale reads
25 N.
Suppose the force of friction on a slidding object is 25 N. The force needed to maintain a constant velocity is
0 N.
A book weighs 4 N. When held at rest in your hands the net force on the book is;
the same
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;
with 10 times as much force
A push in a 1-kg brick accelerates the brick. Neglecting friction, to equally accelerate a 10-kg brick, on would have to push;
force per area
Pressure is defined as
newtons per square meter (or pascals)
The unit of pressure is called
it halves.
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?
4 m/s squared
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?
�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 states that an object;
both moving and nonmoving objects
The law of inertia applies to....
the milk carton has intertia.
A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly.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
inertia
One object has twice as much mass as another object. the first object also has twice as much...
less
Compared to its weight on Earth, a 10 kg object on the moon will weighh....
the same.
Compared to its mass on earth, the mass of a 10 kg object on the moon is
zero
The force required to maintain an object at a constant speed in free space is equal to
30 N
A 15 N force and a 45 N force act on an object in opposite directions. What is the net force on the object.
250 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?
opposite to an object's motion.
Friction is a force that always acts ....
neither- they both have the same mass.
Which has more mass, a kg of feathers or a kg of iron?
35 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?
same size, but in the opposite direction to that of the first object
Whenever an object exerts a force on another object, the second object exerts a force of the...
arrow's push against the bowstring.
An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the...
The force of the balll against the bat.
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 same.
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 small car.
A large truck and a small car traveling at the same speed have a head-on collision. The vehicle to undergo the greater change in velocity will be...
road.
A force is exerted on the tires of a car to accelerate the car along the road. The force is exerted by the....
the exhaust gases on the rocket.
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...
2300 N
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....
pushes against the bat with a force of 200 N.
A baseball player sings his bat and the bat strikes the ball with a force of 200 N. The ball....
an equal force exerted by the water in a forward direction
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?
Both objects apply a force of the same size
In regard to newton's 3rd law, if two moving objectgs collide, what's true about the forces the objects apply on each other?
The canoe moves forward when the water is pushed backwards.
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?