Kinetic
What is the energy resulting from movement?
Kinetic energy
What is energy ready to be used?
Potential energy
What is the ability to make a change to something's energy called?
Work
Energy cannot be created or destroyed, it can only be transferred or transformed is the what
Law of conservation of energy
How many joules of energy are there in 5 J?
5
A truck and a car are travelling down the highway at the same speed. Which has more kinetic energy and why?
The truck as it has more mass.
A bowling ball and a tennis ball are dropped from the same height. Which has more gravitational potential energy and why?
The bowling ball as it has more mass.
A cat jumps up in fright and lands in its original spot. Has the cat changed its displacement and why?
No, because it's back at its original spot.
A ball is thrown into the air and caught. How did the amount of total energy change?
It did not change
How many millijoules of energy are there in 3J?
3000mJ
Two softballs are thrown in a pitching competition. The first ball is thrown at a speed of 5m/s, and the second at 8 m/s. Which has more kinetic energy and why?
The second one, because it is thrown faster.
Two tennis balls are dropped from different heights. One at 10m and one at 20m. Which one has more gravitational potential energy and why?
The second one because it was dropped from a higher point.
A spinning top is spinning in place. Is work being done and why?
No, as the top is not moving.
A footy is kicked from the 50m line and a goal is scored. What happened to the potential energy before the kick?
It was converted into kinetic energy.
A koala on a tree weighs 6kg and is 15m high. How much gravitational potential energy does it possess? (Hint: Ep=mgh, g=9.80m/s)
882 J
A bus comes to a stop and lets off 6 passengers before taking off again. Does the bus have more kinetic energy before or after letting the passengers off and why?
Before, because it has more mass.
A tennis ball is dropped from a height of 20m and bounces up to a height of 10m. Does the ball have more gravitational potential energy when it was first dropped or bounced up and why?
The first drop because it is at a higher point.
A man is pushing against a brick wall. Is work being done and why?
No, as the brick wall is not moving.
When a ball is thrown straight-up, it will stop for a moment at the height of its throw. What happened to the kinetic energy?
It was converted into potential energy.
A crane is lifting a load with a force of 2,000N 5m up in the air. How much work did it use? (Hint: W=Fs)
10,000J
Ethan and Zain are throwing a ball to each other. When Ethan throws it, it takes 2 seconds to reach Zain - but when Zain throws it, it takes 1 second to reach Ethan. Who gave the ball more kinetic energy and why?
Zain, because it didn't take as long to reach Ethan and so was thrown faster.
A rollercoaster's first run is with 10 people. On the second run, there are 14 people on the rollercoaster. In which run was there more gravitational potential energy?
The second run because there was more people and so more mass.
Mr Beards throws a tennis ball to Mr Rossiter. Was work done?
Yes, because the ball changed place.
A ball is bounced from a height of 1m containing 5J of potential energy. When it hits the ground it has 0J of potential energy. How much kinetic energy did it have?
5J
A tennis ball, with a mass of 0.056kg, is thrown at a speed of 10m/s. What is its kinetic energy? (Hint: Ek=0.5mv2)
56 J