Physics Quiz

If a projectile is fired straight up at a speed of 10 m/s, find the total required time to return to its starting position.

1 s

A ball is thrown upwards without air resistance what initial speed does the ball need to remain in the air for total 10 seconds

50m/s

The brakes of a speeding truck are slammed on and it skids to a stop. If the truck were heavily loaded so that it had twice the total mass, the skidding distance would be...

the same

What is the mass of a pet turtle that weighs 10 N?

1 kg

What horizontally-applied force will accelerate a 400-kg crate at 1 m/s^2 across a factory room floor against a friction force of half its weight?

2400 N

A vehicle that weighs 4000 N on the surface of the Earth is travelling in outer space at a speed of 200 m/s. The smallest constant force that must be applied to stop it in 20 seconds is

4000 N

A vehicle that weights 400 N on the surface of the Earth is traveling in outer space at a speed of 400 m/s . It can be stopped by applying a constant force of 20 N for how many seconds?

800 s

A tow truck exerts a force of 3000 N on a car, accelerating it at 2 meters per second per second. What is the mass of the car?

1500 kg

An apple at rest weighs 1 N. The net force on the apple when it is in free fall is

1N

A 1000-kg automobile enters a freeway on-ramp at 20 m/s and accelerates uniformly up to 40 m/s in a time of 10 seconds. How far does the automobile travel during that time? A. 100 m B. 300 m

300m

A car accelerates from rest for 5 seconds until it reaches a speed of 20 m/s. What is the car's acceleration in meters per second?

4 m/s

Joe pushes Bill, who is asleep. Bill A) does not push even after he wakes up B) pushes Joe equally hard even without waking up C) will ineviable push Joe when he wakes up D) push Joe immediately, but not as hard

B

If an object's mass is decreasing while a constant force is applied to the object, the acceleration A) remains the same. B) decreases. C) increases.

C) increases.

The attraction of a person's body toward Earth is called weight. The reaction to this force is A) the person's body pushing against Earth's surface. B) the Earth's surface pushing against the person's body. C) the person's body pulling on the Earth. D) none of these

C) the person's body pulling on the Earth.

What is the gain in speed per second for a freely falling object?

It gains approximately 10 m/s.

A bird sitting on the limb of a tree is moving about 30 km/s with respect to the Sun. If the bird takes 1 second to drop down to a worm below, the worm would be 30 km downrange from the bird when it reached the ground. This faulty reasoning is best countered with Newton's

Law of Inertia / First law

The most basic of the sciences of physics, chemistry, and biology is

Physics

An object is propelled along a straight line path by force. If the net force were doubled, the objects acceleration would be

Twice as much

Two people, one twice as massive as the other, try to play tug of war on a nearly frictionless, level, icy surface. When they begin to tug, they are 12 m apart. They tug by pulling the rope hand over hand, until their hands meet along the rope. How far does the heavier person slide?

X m.=Distance the heavier person moves 2x m.= Lighter person distance. x + 2x = 12 3x = 12 X = 4 m.

Your car is coasting on level ground at 60 km/h and you apply the brakes until the car slows to 40 km/h. If you suddenly release the brakes now, the car tends to A. decrease in speed if no other forces act. B. continue moving at 40 km/h. C. momentarily regain its higher initial speed.

continue moving at 40km/h

If a nonrotating object has no acceleration, then we can say for certain that it is

in mechanical equilibrium

in space far from any star and planet an astronaut throws a ball away far into space

it will keep going

Twelve seconds after starting from rest, an object falling freely will have a speed of

more than 100 m/s.

Drop a rock from a 5-m height and it accelerates at 10 m/s2 and strikes the ground 1 s later. Drop the same rock from a height of 2.5 m and its acceleration of fall is:

the same

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

zero newtons