What is the equation for Newton's 2nd Law of Motion?
(sigma) F = ma or Net F = ma
100
<-------o-------------------->
Which direction does the net force in this free body diagram point? (left or right)
100
The force of the Earth's gravity pulling an object with mass downward is called what?
Weight
100
What is the fundamental force whose magnitude is determined by mass and distance between objects?
Gravity
200
What is the unit of force?
Newton
200
A cart is being pushed. If the acceleration doubles and the mass remained constant, what had to have happened to the force pushing the cart?
The force doubled.
200
Two forces are acting on a sleeping cat. If the cat remains at rest, describe the force vector that is missing from the FBD shown below.
^
|
|
|
0
It should be three units long and point down.
200
Describe what happens to an astronaut's mass and weight as she travels from the Earth to the Moon.
Her mass remains constant, but her weight will decrease.
200
The force of buoyancy points which direction?
Up
300
What basic units is the unit of force composed of?
kg m / s^2
300
You are pushing a file cabinet with a constant force. If the mass of the cabinet were to suddenly double, what would happen to the acceleration of the cabinet?
The acceleration would be cut in half.
300
Fill in the blanks: Force each force, there is a reaction force that is equal in ________________ but opposite in ____________.
magnitude, direction
300
You slide a book across a table and the book eventually comes to a stop. Which force caused the book to slow down?
Friction
300
The magnitude of the bouyant force increases as the difference between the ________________ of the fluid and floating object increases.
densities
400
A box experiences two forces. One force is to the right at 6.0 x 10^2 N. For the box to remain at rest, determine the second force acting on the box.
6.0 x 10^2 N left
400
You push a 3.5 x 10^1 kg 6th grader in the hall. If he accelerates at 2.5 m/s^2 to the right, calculate the force of your push.
8.8 x 10^1 N right
400
A baseball bat strikes a ball with a force of 3.0 x 10^3 N west. Calculate the force that the ball imparts on the bat.
3.0 x 10^3 N east
400
List the four forces associated with powered flight?
Lift, Thrust, Drag, and Gravity/Weight
400
What must you do to a spring to create a spring force?
Compress or stretch the spring
500
A 2.0 x 10^ 5 kg spaceship is moving with a constant velocity of 3.0 x 10^4 m/s right. Calculate the net force acting on the spaceship.
0.0 N
500
A 2.3 x 10^3 kg car experiences a net force of 4.7 x 10^3 N west. Calculate the car's acceleration.
2.0 m/s^2 west
500
You throw a 2.0 x 10^-1 kg with a velocity of 1.5 x 10^1 m/s east. The ball strikes a 4.5 x 10^4 kg semi-truck moving with a velocity of 3.4 x 10^3 m/s west. How does the force of the ball striking the truck compare to the force of the truck striking the ball?
The two forces are equal in magnitude but opposite in direction.
500
You have a mass of 4.0 x 10^1 kg and are leaning into a wall with a force of 1.3 x 10^2 N right. Calculate the amount of normal force that is being provided by the wall acting on you.
1.3 x 10^2 N left
500
You squeeze a spring inward. What is the direction of the spring force?