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In general, any surface exerts two forms on objects that arena contact with it. One force is parallel to the surface and the other is perpendicular to the surface. What these forces called? Specify which force is parallel and which force is perpendicular
Friction : parallel
Normal : perpendicular
A hockey puck slides on ice at a constant velocity. What is the net force acting on the puck?
A bug hits a car window. Which experiences the greater impact force?
They experience the same impact force
Your little sister wants you to give her a ride on her sled. On level ground, what is the easiest way to accomplish this?
Pulling her from the front
If you push with force F on either the heavy box or the light box (together), in which of the two cases os the contact force between the two boxes larger?
Pushing the lighter box
The total mechanical energy of any system is
The sum of the kinetic and potential energy at any point
Two paths lead to the top of a big hill. One is steep and direct, while the other is twice as long but less steep. How much more potential energy would you gain if you took the longer path?
A truck, initially at rest, rolls down a frictionless hill and attains a speed of 20 m/s at the bottom. To achieve a speed of 40 m/s at the bottom, how many times higher must the hill be?
Four times the height
Two stones, one twice the mass of the other, are dropped from a cliff. Just before hitting the ground, what is the kinetic energy of the heavy stone compared to the light one?
Twice as much
Two springs are identical except for their spring constants, K1 < K2. If the same force is used to stretch the springs :
Spring 1 will be stretched farther than spring 2
You and your dog go for a walk to the park. On the way, your dog takes many side trips to chase squirrels or examine fire hydrants. When you arrive at the park, do you and your dog have the same displacement?
You drop a package from a plan flying at constant speed in a straight line. Without air resistance, the package will
Remain vertically under the plane while falling
A small cart is rolling at constant velocity on a flat track. It fires a ball straight up into the air as it moves. After it is fired, what happens to the ball?
It falls right back into the cart
If a submerged object displaces an amount of liquid of greater weight than its own and is then released, the object will
Rise to the surface and float
You and your friends are on a carousel ride rotating at a constant angular speed. You walk to a horse on the outside of the carousel (in the direction away from the center). As you walk,
Your tangential speed increases
Two forces produce the same torque. Does it follow that they have the same magnitude?
A hoop and a disk have the same mass and radius. The disk has half the moment of inertia of the hoop. If the two different objects start from rest at the top of the ramp and reach the bottom of the ramp with a velocity, v. At that point which object has the greater velocity?
The vector sum of all of the torques acting on a particle is equal to the time rate of change of which one of the following quantities?
When temperature changes during the day, which scale, celsius or Fahrenheit, will read a smaller change?
A plastic soda bottle is empty and sits out in the sun, heating the air inside. You put the cap on tightly and put the bottle in the fridge. What happens to the bottle as it cools?
It contracts and the side collapse inward
The specific heat of concrete is greater than that of soil. A baseball field (with real soil) and the surrounding parking lot are warmed up during a sunny day. Which would you expect to cool off faster in the evening when the sun goes down?
The baseball field
A grandfather clock uses a brass pendulum to keep perfect time at room temperature. If the air conditioning breaks down on a very hot summer day, how will the grandfather clock be affected?
Clock will run slower than usual
Will potatoes cook faster if the water is boiling faster?
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