Physics Exam 1 Practice Test

A push on a 1 kg brick accelerates the brick. Neglecting friction, to equally accelerate a 10 kg brick, one would have to push with...?

10 times as much force.

A hockey puck is set in motion across a frozen pond. If ice friction & air resistance are neglected, the force required to keep the puck sliding at constant velocity is...?

0 N

The car has a mass of 1000 kg and accelerates at 2 m/s/s. What is the magnitude of the force exerted on the car?

2000 N

An object is pulled northward with a force of 10 N and southward with a force of 15 N. The magnitude of the net force on the object is...?

5 N

The weight of 0.6 kg of salami is about...?

6.0 N

Suppose a particle is being accelerated through space by a 10 N force. Suddenly the particle encounters a second force of 10 N in the opposite direction of the first force. The particle with both forces acting on it does what...?

Continues at the speed it had when it encountered the second force.

The scientist to first introduce the concept of inertia was...?

Galileo

Compared with the mass of a certain object on earth, the mass of the same object on the moon is the same, less, or more?

The same

A bullet is dropped into a river from a very high bridge. At the same time, another bullet is fired from a gun, straight down towards the water. Neglecting air resistance, the acceleration just before striking the water is...?

The same for each bullet

An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the...?

The arrow's push against the bowstring

Strange as it may seem, it is just as hard to accelerate a car on the moon as it is to accelerate the same car on earth. Why is this?

The mass of the car is independent of gravity.

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by about...?

10 m/s

Disregarding air drag, how fast must you toss a ball straight upward in order to remain in the air for a total of 2 seconds?

10 m/s

A 300 kg bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is...?

3000 N

A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is...?

About 30 m/s

Disregarding air resistance, objects fall at constant...?

Acceleration

A very massive object A and a less massive object B moved toward each other under the influence of gravitation. Which force, if either, is greater?

Both forces are the same.

A player catches a ball. Consider the action force to be the impact of the ball against the player's glove. The reaction to this force is the...?

Force the glove exerts on the ball.

Two objects move toward each other because of gravity. As the objects gets closer and closer, the acceleration of each object does what...?

Increases

If an objects mass is decreasing while a constant force is applied to the object, the acceleration is doing what?

Increasing

A rock is thrown vertically into the air. At the very top of its trajectory the net force on it is...?

It's weight

A force is a vector quantity because it has both...?

Magnitude and direction

A kiolgram is a measure of an objects...?

Mass

In which case would you have the largest mass of gold if your chunk of gold weighed 1 N? Would it be on the moon, planet Jupiter, or the earth?

Moon

A rock is thrown upward at 50° with respect to the horizontal. As it rises it's horizontal component of velocity is?

Remains unchanged