Physics 7 – Flashcards

A truck going 15 km/h has a head-on collision with a small car going 30 km/h. The car has the greater change of momentum because it has the greater speed. The truck has the greater change of momentum because it has the greater mass. They both have the same change in magnitude of momentum because momentum is conserved. Neither the car nor the truck changes its momentum in the collision because momentum is conserved. None of the above is necessarily true.

A small boat coasts at constant speed under a bridge. A heavy sack of sand is dropped from the bridge onto the boat. The speed of the boat increases. does not change. decreases. Without knowing the mass of the boat and the sand, we can't tell.

Two identical billiard balls traveling at the same speed have a head-on collision and rebound. If the balls had twice the mass, but maintained the same size and speed, how would the rebound be different? At slower speed. At a higher speed. No difference.

A golf ball and an equal-mass bean bag are dropped from the same height and hit the ground. The bean bag stays on the ground while the golf ball rebounds. Which experiences the greater impulse from the ground? The golf ball. The bean bag. Both the same. Not enough information

A baseball is pitched horizontally toward home plate with a velocity of 110 km/h. In which of the following scenarios does the baseball have the largest change in momentum? The catcher catches the ball. The baseball is hit straight back to the pitcher at a speed of 110 km/h. The ball is popped straight up at a speed of 110 km/h. Scenarios "The catcher catches the ball." and "The ball is popped straight up at a speed of 110 km/h." have the same change in momentum. Scenarios "The catcher catches the ball.", "The ball is popped straight up at a speed of 110 km/h.", and "The baseball is hit straight back to the pitcher at a speed of 110 km/h." have the same change in momentum.

A railroad tank car contains milk and rolls at a constant speed along a level track. The milk begins to leak out the bottom. The car then The car then slows down. speeds up. maintains a constant speed. Need more information about the rate of the leak.

A bowling ball hangs from a 1.0-m-long cord, (Figure 1) : (i) A 200-gram putty ball moving 5.0 m/s hits the bowling ball and sticks to it, causing the bowling ball to swing up; (ii) 200-gram rubber ball moving 5.0 m/s hits the bowling ball and bounces straight back at nearly 5.0 m/s, causing the bowling ball to swing up. Part A Describe what happens. Describe what happens. The ball swings up farther in (i) than in (ii). The bowling ball swings up by the same amount in both (i) and (ii). The ball swings up farther in (ii) than in (i). Not enough information is given; we need the contact time between the rubber ball and the bowling ball.

ball hit another ball and the bounce off of each other at opposite angles. What arrow would best represent impulse of ball b on ball a

conserved in elastic

A bullet of mass mb is fired horizontally with speed vi at a wooden block of mass mw resting on a frictionless table. The bullet hits the block and becomes completely embedded within it. After the bullet has come to rest within the block, the block, with the bullet in it, is traveling at speed vf. Which of the following best describes this collision? Which of the following best describes this collision? perfectly elastic partially inelastic perfectly inelastic