Unit 1 Physics Test Questions (Link of Equations in Description)

A pot that falls from a ledge and hits the ground at 45 m below the ground at a. 30 m/s b. 60 m/s c. 120 m/s d. more than 120 m/s

a. 30 m/s use velocity equation v = a t find t by using distance formula (1/2) (a) (t^2) = d = (1/2) (10) (t^2) = (45) t = 3 v = (10) (3) v= 30 m/s

Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the opposite direction. Jake's speed relative to the ground is a. 6 m/s b. 10 m/s c. 14 m/s d. none of the above

a. 6 m/s You have to think about this one kinda like net force. 4 m/s going right (example) 10 m/s going opposite direction 10-4 = 6 Your going 6 m/s in the opposite direction of where your running.

When you flick a card from beneath a coin that hardly moves, you're illustrating a. Inertia b. Equilibrium c. Support Force d. Friction

a. Inertia Inertia states that an object not in motion will stay still unless acted on by another force. Now an object has inertia and small changes will not affect it greatly. So the coin doesn't move.

A ball rolls along a horizontal track in a certain time. If the track has a dip in it, the time to roll the length of the track will be a. Less b. The same c. More

a. Less Bro idk how to explain this. Things go faster if there's a dip.

A large truck and a small car traveling at the same speed have a head-on collision. The vehicle that undergoes the greatest change in velocity will be the a. Small car b. Large truck c. Same for both

a. Small Car Velocity = Acceleration x Time Time is same Acceleration = Force / Mass Force is same. Mass is different. Car has more acceleration bc small mass. So car go through more change in velocity

A car by itself is capable of a certain maximum acceleration. When it tows a car of the same mass, its acceleration is a. one half b. one third c. one fourth d. the same e. none of the above

a. one half A = F/M > A = F/2M 1 = 1/1 > 1/2 = 1 / 2(1)

A cart changes speed from 90 m/s to 100 m/s in 10 seconds. During this time interval it acceleration is a. Zero b. 1 m/s^2 c. 10 m/s^2 d. none of the above

b. 1 m/s^2 (100 m/s - 90 m/s) / 10 s = 10 m/s / 10 s = 1 m/s /s =1 m/s^2

Neglecting air resistance, a bullet fired straight down from the top of a high cliff has an acceleration of a. less than 10 m/s^2 b. 10 m/s^2 c. more than 10 m/s^2 d. depends on the height of the cliff

b. 10 m/s^2 Ngl after 12 questions I've lost all motivation to finish this. The only reason my mind is pushing through is because i think explain these questions is a good way to study. Wren, if you read this, gg for all the quizlets. IDK how you do it. Now idk really how to explain this question but ill try my best. So its taking about acceleration so the idea is that since the bullet has been fired off. The speed of the bullet (fired speed) is constant and the bullet only has a change in velocity from gravity. So its has an acceleration of 10 m/s^2

You want to measure the height of a cliff. You drop a rock off the edge and measure the time it takes to hit the ground. You measure 4 seconds. How high is the cliff? a. 40 m b. 80 m c. 120 m d. 400 m

b. 80 m Use the distance formula. d= 1/2 a t^2 Gravity is 10 m/s (1/2) (10) (4^2) = 80 m

If an object's mass is decreasing while a constant force is applied to the object, the acceleration a. Decreases b. Increases c. Remains the Same

b. Increases A = F/M As M decreases and F remains the same, A increases.

Compared to the mass of an apple on Earth, the mass of the apple on the Moon is a. one sixth as much b. the same c. six time as much d. Zero

b. The same Mass is how much space you take up. So mass don't change. Weight changes bc its mass depending on gravity.

When you drop a rubber ball on the floor and it bounces back. The force exerted on the ball to produce bouncing is by the a. ball b. floor c. need more information

b. floor floor applies support force

When you walk, you push on the floor to the left and the floor a. pushes on you to the left b. pushes you to the right c. both of these simultaneously d. can only wish it could push on you e. none of the above

b. pushes you to the right When you push on the wall, the wall pushes on you. This is called support force. The direction of support force is the exact opposite of the force initially applied. Up and Down Left and Right So if you pushed left, the wall pushes right.

A bowling ball and a baseball accelerate equally when falling in a vacuum because a. their velocities are the same b. the ratio of their weights and mass is the same c. the force of gravity is the same for each in the vacuum d. the force of gravity does not act in a vacuum e. none of the above

b. the ratio of their weights and mass is the same If it be a vacuum then there be no weight. So the ratio of weight (force) to mass is the same.

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is a. more than 10 N b. less than 10 N c. 10 N

c. 10 N So, since the object be already moving. We just need to get rid of the friction. So if da friction 10 then applied force be 10.

Jason weighs 150 N and sits on his big brother's shoulders. Big brother weighs 400 N. The support force supplied by the floor must be a. 150 N b. 400 N c. 550 N d. more than 550 N

c. 550 N Support force is the weight being exerted to support an object (hence the name). So you just add da numbers and den you good. 150 + 400 = 550

A heavy block at rest is suspended by a vertical rope. When the block accelerates upward by the rope, the rope tension a. is less than its weight b. equal its weight c. is greater than its weight

c. is greater than its weight IDK how to explain. It is what it is. If you can explain it the password to change stuff is "FINALS"

You are in a rocket ship in outer space gaining speed. You suddenly run out of fuel. When you run out of fuel, your rocket a. gains speed for a short time, then slows down to a constant velocity. b. gains speed for a short time, slows down, and eventually stops c. no longer gains speed d. Starts slowing down

c. no longer gains speed All right what's up yo. 2 questions in and I already regret this. So again, Inertia states that an object in motion will stay in motion unless acted on by another force. So, yo, space has no forces. So when the rocket ship runs out of fuel, the rocket will continue to go at the same speed at which the fuel ended. So if the ship was going six million miles per sec and then fuel ran out then the ship would continue to go six million miles per sec.

Three kids pull on a toy. Kim pulls with a force of 30 N north, Jim pulls with a force of 30 N south, and Tim pulls with a force of 15 N east. The acceleration of the toy is a. 10 m/s^2 b. 15 m/s^2 c. 33 m/s^2 d. need more info

d. Need more info. IDK. Password to change stuff is "FINALS" if you know how to explain.

Which of the following is a vector quantity? a. area b. Volume c. Mass d. None of the Above

d. None of the Above So to quote the great Vector from Despicable Me, "It's a mathematical term, a quantity represented by an arrow with both direction and magnitude". So none of these have a direction. So none of the above. https://youtu.be/bOIe0DIMbI8?t=18

An object in mechanical equilibrium is an object a. moving with a constant velocity b. having no changes in velocity c. at rest d. all of the above

d. all of the above Alright so, an object is in mechanical equilibrium if all forces equal up to 0. This can allow the object to stay still or be moving at a constant velocity.

A vehicle undergoes acceleration when it a. gains speed b. loses speed c. changes direction d. all of the above

d. all of the above So acceleration in physics is different from acceleration in da real world. Acceleration is a change in velocity. So slowing down or speeding up both cause acceleration. Acceleration is also affected by direction. Google say its bc its a vector quantity but just think of it this way, if your driving and your turning you slow down.

When a ball falls downward, it may have a net force a. equal to its weight b. of zero c. equal to its weight minus air resistance d. any of the above e. none of the above

d. any of the above Alright so this one sucks. So, the ball can have a net force of its weight bc air resistance isn't strong at the start. The ball can have a net force of weight - air resistance in between the start of the drop and before it reached terminal velocity. The ball can have a net force of 0 by having air resistance equal to the weight (Reaches Terminal Velocity).

An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the a. combined weight of the arrow and the bowstring b. friction of the ground against the archer's feet c. grip of the archer's hand on the bow d. arrow's push against the bowstring

d. arrow's push against the bowstring Support force involves only the two initial things. So in this problem, it involves the string and arrow. If the bowstring applies force on the arrow then the arrow applies force to the bowstring.

A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are turned off, the force required to keep the puck sliding at constant velocity is a. equal to its weight b. equal to its weight divided by its mass c. equal to its mass times its weight d. none of the above

d. none of the above. Inertia states that an object will keep moving unless acted on by an outside force. Since there is no friction or air resistance there are not outside forces. So, the puck will continue to move forever or until an outside force interacts with the puck.