Compare 8 kilograms of feathers to 6 kilograms of lead. Which has more mass? Which has more inertia?
The feathers for both
100
A rock is falling without air resistance. What force(s) is/are acting on the rock?
Weight
100
What is the net force when an object is in equilibrium?
Zero
100
What are the units of kinetic energy?
Joules
100
A 20.0-newton force is used to push a 2.00-kilogram cart a distance of 5.00 meters. What is the work done on the cart by the push?
100 J
200
The law of inertia applies to objects in what two states of motion?
Moving and at rest
200
What direction is friction?
Opposite the direction of motion
200
Three forces act on an object that is in equilibrium. If the 1st is a 5N force north, and the 2nd is a 2N force south, what must the 3rd be?
3N south
200
What type of energy is that stored in a spring?
Elastic potential energy
200
A child applies a constant 20 N force along the handle of a wagon. But, he is not strong enough and the cart does not move. How much work does the child do?
O J
300
A container of rocks with a mass of 65.0 kg is brought back from the Moon’s surface where the acceleration due to gravity is 1.63 m/s^2. What is the weight of the container of rocks on the Earth’s surface?
650 N
300
What direction is the normal force?
Perpendicular to the surface
300
If the sum of all the forces acting on a moving object is zero, what will the object do?
Continue moving with constant velocity
300
What is the energy that is stored in the object's position called?
Gravitational potential enegy
300
A 2.0 kg bird is gliding with a speed of 3 m/s. What is the bird’s kinetic energy?
9 J
400
On the surface of planet X, the acceleration due to gravity is 16 m/s2. What is the weight of a 6.0 kg mass located on the surface of planet X?
96 N
400
A net force of 25 N is applied horizontally to a 10-kilogram block resting on a table. What is the magnitude of the acceleration of the block?
2.5 m/s^s
400
Coyote wants to catch Road Runner and so he compresses a spring! The spring has a force of 13 N pushing on Coyote to the right. With what force does the 88 kg Coyote need to push to remain at rest?
- 13 N
400
What force produces heat?
Friction
400
A 70kg high-diver is on a diving platform that is 10 meters above the water. What is the high diver’s gravitational potential energy?
7000 J
500
As a car moves to the right, does the force of gravity acting on the car do positive, negative, or zero work?
Zero
500
What kind of force produces acceleration?
An unbalanced force
500
The vector diagram represents two forces, F1 and F2, simultaneously acting on an object. Draw the force vector that will put the object in equilibrium. (Hint: Find the resultant vector first!)
(Ms. Kyper will draw it!)
500
In the equation for elastic potential energy, what does the x in the equation stand for?
The amount the spring is compressed or stretched
500
As Keisha slides across the ground, the force of friction acting on her is 40 N. For the first 2 meters, she slides across ice that has no friction. Then she slides across the ground for 3 meters. How much energy is released as heat?