Unit 1
A _______ quantity is described by a magnitude with a direction.
vector
What is Newtons First Law?
an object at rest will remain at rest unless acted on by an outside force
What is the force on a ramp?
mg(sin0)
What is work?
work done by the exerting force
What is the formula for momentum?
p=mv
the area under an acceleration-time graph is equal to the object's
velocity
What is Newton's Second Law?
F=ma
What allows a pencil to stay on a table without sliding?
friction
What is the equation for work?
W=Fd(cos0)
The unit for energy and work is _____
J
The area under a velocity-time graph is equal to the object's ___________
displacement
What is the acceleration of the 20 kg box that has a force of 300 N exerted to the right?
15 m/s2
When an object is accelerating, the objects velocity remains the same.
false
What is the formula for kinetic energy?
What is the formula for elastic potential energy?
k=1/2mv2
us=1/2kx2
A 1.00kg object is traveling at 2.00m/s. What is the object's momentum?
2 kgm/s
If you throw a ball straight up in the air, at the highest point, the balls velocity is
zero
A woman weighing 500 Newtons is standing in an elevator that rises with an acceleration of .5. What is the force exerted by the elevator on the woman?
750 N
A pair of tennis shoes are held by a woman at a distance (D). If the woman doubles the distance, what happens to the force between the tennis shoes?
1/4 the original force
A force of 20 N compresses a spring with a spring constant 50 N/m. How much energy is stored in the spring?
4 J
What is the potential energy of a 2 kg ball being held at a height of 45 m?
900 N
A ball is thrown straight up with a velocity of 15 m/s. What is the speed of the ball when it returns to its original height?
15 m/s
A 100 kg skydiver is falling at a constant 20 m/s. What is the net force acting on him?
0 N
Ms. Allen increases her velocity from .25 m/s to 3.25 m/s in 10 seconds. What is her acceleration?
.3 m/s2
An object with a mass of 2.0 kg is initially at rest at a position x = 0. A force F is applied to the object over a displacement of 5.0 m. What is the total work done on the object at the end of 5.0 m?
(f max = 50)
125 J
Truck 1 is a 250-kg object traveling at a velocity of 25 m/s, and truck 2, is a 200-kg object traveling at a velocity of 30 m/s. Which object has a larger kinetic energy?
Truck 2