JEOPARDY REVIEW Subterm 1

Topics Motion in 1 direction Motion in 2 directions Force and Newton’s Laws Energy and Momentum

Vectors Resolve the vector below into it’s rectangular components: 5.0sin32 = 2.6 5.0 32 5.0cos32 = 4.2

Vectors 22 m/s at a 15 incline A truck drives up a hill with a horizontal velocity component of 21 m/s and vertical component of 5.7 m/s. What is the resultant velocity of the truck (speed and angle of incline above the horizontal)? 22 m/s at a 15 incline

C (Newton’s First Law) Projectile Theory Assuming air resistance is negligible, what happens to the horizontal velocity of a projectile after it is released? A. velocity increases B. velocity decreases C. velocity remains constant C (Newton’s First Law)

Projectiles Launched Horizontally A pelican flying along a horizontal path drops a fish from a height of 5.4 m while traveling 5.0 m/s. How far does the fish travel horizontally before it hits the water below? 5.3 m

Projectiles Launched at an Angle What formula or set of formulas would you use to solve the word problem below? A firefighter 50.0 m away from a burning building directs a stream of water from a fire hose at an angle of 30.0 above the horizontal. If the velocity of the stream is 40.0 m/s, at what height will the stream of water strike the building?

Projectiles Launched at an Angle Solve: A stone is thrown at an angle of 30.0 above the horizontal from the top edge of a cliff with an initial speed of 12 m/s. A stopwatch measures the stone’s trajectory time from the top of the cliff to the bottom at 5.6 s. What is the height of the cliff? 120 m

That’s a lot of WORK A child moving at constant velocity carries a 2 N ice-cream cone 3 m across a level surface. What is the net work done on the ice-cream cone? 0 J

That’s a lot of WORK A horizontal force of 200 N is applied to move a 55 kg television set across a .01 km long surface. What is the work done by the 200 N force on the television set? 2000 J

I just don’t have the ENERGY A 3.50-kg rubber chicken flying through the air has a kinetic energy of 4586 J. What is the velocity of the rubber chicken? 51.2 m/s

distance spring is stretched or compressed Its SPRINGtime In the formula for springs below, what does “x” represent (be specific)? distance spring is stretched or compressed

Its SPRINGtime The staples inside a stapler are kept in place by a spring with a relaxed length of 0.115 m. If the spring constant is 51 N/m, how much elastic potential energy is stored in the spring when its length is 0.150 m? 0.031 J

You’ve got POTENTIAL A 500. N crate is at the top of a 5.00 m long ramp, which is inclined at 20.0° with the horizontal. What is its potential energy? 855 J

It’s the Law A cannonball is fired into space with a force of 10 N. How much force is needed to keep the cannonball moving in frictionless space? Zero Newtons

It’s the Law A 2000 kg car experiences a 400 N force from air resistance. What must the force of the engine be to accelerate the car at a constant 3.0 m/s2? 6,400 N

Don’t get Dizzy! Yes; towards the center of the curve A car rounds a curve at a constant speed. Is there a net force on the car? And if so, in what direction is it? Yes; towards the center of the curve

On your marks, get set, GO Fifteen seconds after starting from rest, a car is going 30 m/s. What is the car’s acceleration? 2 m/s2

Jenny Craig says: A block of ice has a mass of 16 g. How much does the block weigh? 0.16 N

Don’t get Dizzy! A car is negotiating a flat curve of radius of 50.0 m with a speed of 20.0 m/s. The centripetal force provided by friction is 1.20 x 104 N. What is the mass of the car? 1,500 kg

Don’t get Dizzy! What is the centripetal acceleration of a point on the perimeter of a bicycle wheel of diameter 70.0 cm when the bike is moving 8.0 m/s? 180 m/s2

The gravity of the situation A satellite is in circular orbit 230 km above the surface of the earth. It is observed to have a period of 89.0 min. From this information, calculate the mass of the earth. (the mean radius of the earth is 6.38 x 106 m) 6.0 x 1024 kg

Momentum Two identical freight cars roll without friction towards each other on a level track. One rolls at 5.0 m/s and the other rolls at 2.0 m/s. After the cars collide, they couple and roll together. What is the new speed of the coupled cars? 1.5 m/s

Momentum F  t = mv = mv final – mv initial A 150g baseball reaches a batter with a speed of 25 m/s. After it has been struck, it leaves the bat at 35 m/s in the opposite direction. If the ball was in contact with the bat for .001 s, find the average force exerted on it during this period. 25 35 F  t = mv = mv final – mv initial F (.001 sec) = (.150kg)(35m/s)-(.150)(-25) F = 9000N

Momentum V = 2 m/s Mgvg + msvs = (mg+ms)vgs 90 kg m/s + 0 = 40 v A 30 kg girl who is running at 3 m/s jumps on a stationary 10 kg sled on a frozen lake. How fast does the sled then move? Mgvg + msvs = (mg+ms)vgs 90 kg m/s + 0 = 40 v V = 2 m/s